482 results on '"Nam BH"'
Search Results
2. Inference on Correlated Discrimination Measures in Survival Analysis
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ANTOLINI, LAURA, Nam, BH, D’Agostino, RB, Antolini, L, Nam, B, and D’Agostino, R
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Correlated C indexe ,Jackknife, U-statistics - Abstract
The area under the receiver operating characteristic curve (overall C) is a widely used measure of a prognostic model discrimination. In this paper, we develop a nonparametric test for the comparison of two correlated C indexes of two different models when applied to the same population. We extend the DeLong's approach and use the theory of the jackknife methodology applied to correlated one sample generalized U-statistics. We derive the distribution of correlated estimators of C indexes as well as a consistent estimate of the asymptotic variance, leading to an asymptotically normal test.
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- 2004
3. Inference on Correlated Discrimination Measures in Survival Analysis
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Antolini, L, Nam, B, D’Agostino, R, ANTOLINI, LAURA, Nam, BH, D’Agostino, RB, Antolini, L, Nam, B, D’Agostino, R, ANTOLINI, LAURA, Nam, BH, and D’Agostino, RB
- Abstract
The area under the receiver operating characteristic curve (overall C) is a widely used measure of a prognostic model discrimination. In this paper, we develop a nonparametric test for the comparison of two correlated C indexes of two different models when applied to the same population. We extend the DeLong's approach and use the theory of the jackknife methodology applied to correlated one sample generalized U-statistics. We derive the distribution of correlated estimators of C indexes as well as a consistent estimate of the asymptotic variance, leading to an asymptotically normal test.
- Published
- 2004
4. Effect of chemotherapy on the outcome of self-expandable metallic stents in gastric cancer patients with malignant outlet obstruction.
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Kim CG, Park SR, Choi IJ, Lee JY, Cho SJ, Park YI, Nam BH, and Kim YW
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- 2012
5. Risk assessment tool for distant recurrence after platinum-based concurrent chemoradiation in patients with locally advanced cervical cancer: a Korean gynecologic oncology group study.
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Kang S, Nam BH, Park JY, Seo SS, Ryu SY, Kim JW, Kim SC, Park SY, Nam JH, Kang, Sokbom, Nam, Byung-Ho, Park, Jeong-Yeol, Seo, Sang-Soo, Ryu, Sang-Young, Kim, Jae Weon, Kim, Seung-Cheol, Park, Sang-Yoon, and Nam, Joo-Hyun
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- 2012
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6. Association of family history with cancer recurrence and survival in patients with gastric cancer.
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Han MA, Oh MG, Choi IJ, Park SR, Ryu KW, Nam BH, Cho SJ, Kim CG, Lee JH, and Kim YW
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- 2012
7. Aspirin use and bleeding risk after endoscopic submucosal dissection in patients with gastric neoplasms.
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Cho SJ, Choi IJ, Kim CG, Lee JY, Nam BH, Kwak MH, Kim HJ, Ryu KW, Lee JH, and Kim YW
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- 2012
8. Predictive factors of pathologic complete response and clinical tumor progression after preoperative chemotherapy in patients with stage II and III breast cancer.
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Jeong JH, Jung SY, Park IH, Lee KS, Kang HS, Kim SW, Kwon Y, Kim EA, Ko KL, Nam BH, Lee S, and Ro J
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- 2012
9. Real-time endobronchial ultrasound-guided transbronchial needle aspiration in mediastinal staging of non-small cell lung cancer: how many aspirations per target lymph node station?
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Lee HS, Lee GK, Kim MS, Lee JM, Kim HY, Nam BH, Zo JI, Hwangbo B, Lee, Hee Seok, Lee, Geon Kook, Lee, Hyun-Sung, Kim, Moon Soo, Lee, Jong Mog, Kim, Hyae Young, Nam, Byung-Ho, Zo, Jae Ill, and Hwangbo, Bin
- Abstract
Objective: The goal of this study was to determine the optimal number of aspirations per lymph node (LN) station during endobronchial ultrasound (EBUS)-guided transbronchial needle aspiration (TBNA) for maximum diagnostic yield in mediastinal staging of non-small cell lung cancer (NSCLC) in the absence of rapid on-site cytopathologic examination.Methods: EBUS-TBNA was performed in potentially operable NSCLC patients with mediastinal LNs accessible by EBUS-TBNA (5 to 20 mm). Every target LN station was punctured four times.Results: We performed EBUS-TBNA in 163 mediastinal LN stations in 102 NSCLC patients. EBUS-TBNA confirmed malignancy in 41 LN stations in 30 patients. Two malignant LN stations were missed in two patients. The sensitivity, specificity, positive predictive value, negative predictive value (NPV), and accuracy of EBUS-TBNA in predicting mediastinal metastasis were 93.8%, 100%, 100%, 96.9%, and 97.9%, respectively. Sample adequacy was 90.1% for one aspiration, and it reached 100% for three aspirations. The sensitivity for differentiating malignant from benign LN stations was 69.8%, 83.7%, 95.3%, and 95.3% for one, two, three, and four aspirations, respectively. The NPV was 86.5%, 92.2%, 97.6%, and 97.6% for one, two, three, and four aspirations, respectively. Maximum diagnostic values were achieved in three aspirations. When at least one tissue core was obtained by the first or second aspiration, the sensitivity and NPV of the first two aspirations were 91.9% and 96.0%, respectively.Conclusions: Optimal results can be obtained in three aspirations per LN station in EBUS-TBNA for mediastinal staging of potentially operable NSCLC. When at least one tissue core specimen is obtained by the first or second aspiration, two aspirations per LN station can be acceptable. [ABSTRACT FROM AUTHOR]- Published
- 2008
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10. Is the New Seventh AJCC/UICC Staging System Appropriate for Patients with Gastric Cancer?
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Yoon HM, Ryu KW, Nam BH, Cho SJ, Park SR, Lee JY, Lee JH, Kook MC, Choi IJ, and Kim YW
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- 2012
11. Association of parental heart failure with risk of heart failure in offspring.
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Lee DS, Pencina MJ, Benjamin EJ, Wang TJ, Levy D, O'Donnell CJ, Nam BH, Larson MG, D'Agostino RB, Vasan RS, Lee, Douglas S, Pencina, Michael J, Benjamin, Emelia J, Wang, Thomas J, Levy, Daniel, O'Donnell, Christopher J, Nam, Byung-Ho, Larson, Martin G, D'Agostino, Ralph B, and Vasan, Ramachandran S
- Abstract
Background: The association between heart failure in parents and the prevalence of left ventricular systolic dysfunction and the risk of heart failure in their offspring has not been investigated in a community-based setting.Methods: We examined the cross-sectional association of heart failure in parents with the prevalence of left ventricular systolic dysfunction, as well as left ventricular mass, internal dimensions, and wall thickness, in 1497 participants of the Framingham Offspring Study (mean age, 57 years; 819 women) who underwent routine echocardiography. We also investigated prospectively whether heart failure in parents increased the risk of heart failure in 2214 offspring (mean age, 44 years; 1150 women).Results: As compared with the 1039 participants whose parents did not have heart failure, the 458 participants in the cross-sectional cohort who had at least one parent with heart failure were more likely to have increased left ventricular mass (17.0 percent vs. 26.9 percent), left ventricular internal dimensions (18.6 percent vs. 23.4 percent), and left ventricular systolic dysfunction (3.1 percent vs. 5.7 percent); the multivariable-adjusted odds ratios were 1.35 (95 percent confidence interval, 0.99 to 1.84), 1.29 (95 percent confidence interval, 0.96 to 1.72), and 2.37 (95 percent confidence interval, 1.22 to 4.61), respectively. In the longitudinal cohort, heart failure developed in 90 offspring during follow-up (mean length of follow-up, 20 years). The age- and sex-adjusted 10-year incidence rates of heart failure were 2.72 percent among offspring with a parent with heart failure, as compared with 1.62 percent among those without a parent with heart failure. This increase in risk persisted after multivariable adjustment (hazard ratio, 1.70; 95 percent confidence interval, 1.11 to 2.60).Conclusions: Heart failure in parents is associated with an increased prevalence of left ventricular systolic dysfunction cross-sectionally and an elevated risk of heart failure longitudinally. Our data emphasize the contribution of familial factors to the heart-failure burden in the community. [ABSTRACT FROM AUTHOR]- Published
- 2006
12. The impact of direct health facility financing on MNCH service provision: results from a comparative, before-after study in Pwani Region, Tanzania.
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Oh KK, Ferdinand JG, Kapologwe NA, Ngaiza BM, Gordon JM, Lim D, Ngowi AE, Yusuph SA, Kim H, Park H, Ahn S, Nam BH, and Kim CY
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- Humans, Tanzania, Female, Pregnancy, Infant, Newborn, Health Facilities economics, Maternal-Child Health Services economics, Maternal-Child Health Services organization & administration, Adult, Controlled Before-After Studies, Cesarean Section statistics & numerical data, Cesarean Section economics, Healthcare Financing
- Abstract
Background: Pwani Regional Secretariat in Tanzania implemented the Maternal, Neonatal, and Child Health Project (2016-2022) through Direct Health Facility Financing (DHFF), which allocates funds directly to health facilities. This study assessed the impact of the six-year DHFF project in Pwani region., Methods: The study utilised District Health Information Software 2 data from 18 intervention health facilities in Pwani region. Control groups comprised an equal number of facilities from Pwani and Dodoma regions where the project was not implemented. Key indicators assessed included 'ANC 4 + Rate (%)', 'Percentage of Mothers tested for Anaemia during ANC', 'Caesarean Section Delivery Rate (%)', 'Percentage of Mothers and Newborns receiving PNC services within 48 hours', 'Delivery Complication Rate (%)', and 'SBA Delivery Rate (%)' which are associated with the project interventions. The impact of the project was analysed using a paired sample t-test comparing baseline and endline data. We evaluated the significance of the dependent variables using one-way ANOVA with control groups, with the Tukey-Kramer test for post hoc analysis. Chi-square test assessed the significance of Caesarean Section Delivery Rate and the relationship between variables and health facility conditions. Pearson correlation test was used for significance between funding size and the change of MNCH variables. Statistical significance at 0.05 was calculated., Results: The project showed limited positive impacts, only in the 'Percentage of Mothers tested for Anaemia during ANC' (****p < 0.0001), 'Percentage of Newborns receiving PNC within 48 hours' (**p = 0.0095), and 'SBA Delivery Rate' (***p = 0.0043). The health facility assessment identified positively influencing factors on service delivery, such as facility type (*p = 0.0347), distance to the facility (****p < 0.0001), and internet connectivity (*p = 0.0186). We found that the project did not improve most MNCH indicators, including the CEmONC coverage (χ2 = 2.82, p = 0.2448, df = 2), which was known to be the leading outcome., Conclusion: The project had limited impacts on MNCH outcomes due to various factors. While the health facility assessment highlighted positive influences on service delivery, significant areas for improvement remain, including referral systems and infrastructure. Operational research findings indicate that the effectiveness of the DHFF could be enhanced by refining its management and governance structures., Competing Interests: Declarations Ethics approval and consent to participate Not applicable because the secondary data had no identifying information, and it was completely devoid of such information or was appropriately coded so that researchers did not have access to the codes. Competing interests The authors declare no competing interests., (© 2024. The Author(s).)
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- 2024
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13. From the Beginning of the Korean Gynecologic Oncology Group to the Present and Next Steps.
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Min KJ, Kim NK, Song JY, Choi MC, Lee SW, Lee KH, Kim MK, Kang S, Choi CH, Lee JW, Lee EJ, Eom KY, Kim SW, Cho H, Lee SJ, Lim MC, Bae J, Yoo CW, Kim K, Kim DY, Lee C, Ryu SY, Jeon S, Kim JW, Nam BH, Kang SB, Kim KT, Nam JH, Kim BG, Kim YM, and Kim JH
- Abstract
The Korean Gynecologic Oncology Group (KGOG) was established in 2002 and is the only organization in Korea conducting multi-center clinical trials for gynecologic cancers. Since its re-establishment as a non-profit organization in 2021, KGOG has grown significantly, now including 207 gynecologic oncology specialists from 76 hospitals. This growth is a testament to the dedication and hard work of all those involved in the organization. KGOG is committed to maximizing the activation of multi-center clinical research through policies that support patients with rare diseases and gynecologic cancer research, focusing on strengthening institutional capacity, equalizing participation opportunities, and enhancing information sharing. A significant milestone for KGOG was becoming a member of the US Gynecologic Oncology Group (GOG) in 2005, allowing participation in GOG clinical trials. KGOG later joined the Gynecologic Cancer InterGroup (GCIG) and strengthened its capabilities by hosting the first Endometrial Cancer Consensus Conference-Clinical Research (ECCC-CR) in 2023. KGOG holds biannual meetings and symposia, as well as 224 operating committee meetings annually to review the discussions of the Tumor Site Committee. KGOG has conducted 156 investigator-initiated trial (IIT) or sponsor-initiated trial (SIT) studies as KGOG-led or participated in research. Currently, 18 studies are registered, and 10 are in preparation. To date, 68 papers have been published. KGOG conducts six national projects and collaborates with external organizations such as the NRG Oncology Foundation, Gynecologic Oncology Group Partners (GOG-P), GCIG, East Asian Gynecologic Oncology Trial group (EAGOT), and the Japanese Gynecologic Oncology Group (JGOG). Through collaboration with renowned international research institutions, KGOG has significantly expanded the scope of its research, achieving noteworthy clinical outcomes. This report not only introduces the history and recent status of KGOG but also presents the exciting future direction of the organization, filled with potential breakthroughs and advancements in gynecologic oncology research.
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- 2024
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14. Development and Feasibility Assessment of Mobile Application-Based Digital Therapeutics for Postoperative Supportive Care in Gastric Cancer Patients Following Gastrectomy.
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Park JH, Lee HJ, Kim J, Cho YS, Lee S, Park S, Choe H, Song E, Kim Y, Kong SH, Park DJ, Nam BH, and Yang HK
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- Adult, Aged, Female, Humans, Male, Middle Aged, Body Mass Index, Postoperative Care methods, Surveys and Questionnaires, Feasibility Studies, Gastrectomy, Mobile Applications, Stomach Neoplasms surgery
- Abstract
Purpose: This study aimed to develop and assess the feasibility and effectiveness of digital therapeutics for supportive care after gastrectomy., Materials and Method: The study included 39 patients with gastric cancer who underwent minimally invasive gastrectomy and were able to use a mobile application (app) on their smartphones. The developed research app automatically calculates and provides daily targets for calorie and protein intake based on the patient's body mass index (BMI). Patients recorded their daily diets, weights, and symptoms in the app and completed special questionnaires to assess the feasibility of the app in real-world clinical practice., Results: At the 10-week follow-up, the mean questionnaire scores for ease of learning, usability, and effectiveness of the app (primary endpoint) were 2.32±0.41, 2.35±0.43, and 2.4±0.39 (range: 0-3), respectively. Patients were classified as underweight (<18.5, n=4), normal (18.5-24.9, n=24), or overweight (≥25.0, n=11) according to predischarge BMI. Underweight patients showed higher compliance with app usage and a higher rate of achieving the target calorie and protein intake than normal weight and overweight patients (98% vs. 77% vs. 81%, p=0.0313; 102% vs. 75% vs. 61%, P=0.0111; 106% vs. 79% vs. 64%, P=0.0429). Two patients transitioned from underweight to normal weight (50.0%), one patient (4.3%) transitioned from normal weight to underweight, and two patients (22.2%) transitioned from overweight to normal weight., Conclusions: The mobile app is feasible and useful for postoperative supportive care in terms of ease of learning, usability, and effectiveness. Digital therapeutics may be an effective way to provide supportive care for postgastrectomy patients, particularly in terms of nutrition., Trial Registration: ClinicalTrials.gov Identifier: NCT04800991., Competing Interests: No potential conflict of interest relevant to this article was reported., (Copyright © 2024. Korean Gastric Cancer Association.)
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- 2024
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15. Feasibility of Regional Lymphadenectomy for Stomach-Preserving Surgery in Early Gastric Cancer Omitting Sentinel Node Navigation: A Post Hoc Analysis of the SENORITA Trial.
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Park SH, Kim YW, Min JS, Yoon HM, An JY, Eom BW, Hur H, Lee YJ, Cho GS, Park YK, Jung MR, Park JH, Hyung WJ, Jeong SH, Kook MC, Han M, Nam BH, and Ryu KW
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- Humans, Male, Female, Middle Aged, Lymphatic Metastasis, Sentinel Lymph Node Biopsy methods, Aged, Follow-Up Studies, Prognosis, Laparoscopy methods, Adult, Stomach Neoplasms surgery, Stomach Neoplasms pathology, Lymph Node Excision methods, Feasibility Studies, Gastrectomy methods, Sentinel Lymph Node pathology, Sentinel Lymph Node surgery, Organ Sparing Treatments methods
- Abstract
Background: Sentinel node navigation (SNN) has been known as the effective treatment for stomach-preserving surgery in early gastric cancer; however, SNN presents several technical difficulties in real practice., Objective: This study aimed to evaluate the feasibility of regional lymphadenectomy omitting SNN, using the post hoc analysis of a randomized controlled trial., Methods: Using data from the SENORITA trial that compared laparoscopic standard gastrectomy with lymphadenectomy and laparoscopic SNN, 237 patients who underwent SNN were included in this study. Tumor location was divided into longitudinal and circumferential directions. According to the location of the tumor, the presence or absence of lymph node (LN) metastases between sentinel and non-sentinel basins were analyzed. Proposed regional LN stations were defined as the closest area to the primary tumor. Sensitivities, specificities, positive predictive values, and negative predictive values (NPV) of SNN and regional lymphadenectomy were compared., Results: Metastasis to non-sentinel basins with tumor-free in sentinel basins was observed in one patient (0.4%). The rate of LN metastasis to non-regional LN stations without regional LN metastasis was 2.5% (6/237). The sensitivity and NPV of SNN were found to be significantly higher than those of regional lymphadenectomy (96.8% vs. 80.6% [p = 0.016] and 99.5% vs. 97.2% [p = 0.021], respectively)., Conclusions: This study showed that regional lymphadenectomy for stomach-preserving surgery, omitting SNN, was insufficient; therefore, SNN is required in stomach-preserving surgery., (© 2024. The Author(s).)
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- 2024
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16. Utilization of Multiple Recycled Materials in Asphalt Concrete: Mechanical Characterization and Cost-Benefit Analysis.
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Han HS, Golestani B, Park K, Cho B, and Nam BH
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This study examines the strategic incorporation of various recycled materials into asphalt concrete, specifically focusing on municipal solid waste incineration bottom ash (MSWI BA), recycled asphalt shingle (RAS), and recycled concrete aggregate (RCA). Due to the high porosity of MSWI BA and RCA, and the significant asphalt binder content (30-40%) found in RAS, there is a need to increase the amount of liquid asphalt used. RAS is posited as an efficient substitute for the asphalt binder, helping to counterbalance the high absorption characteristics of MSWI BA and RCA. The research objective is to quantitatively evaluate the effect of the combined use of RAS, MSWI BA, and RCA in Hot Mix Asphalt (HMA). This study encompasses several laboratory evaluations (i.e., rutting and tensile strength tests) and a cost-benefit analysis, which is a life cycle cost analysis. The results indicate that the combined use of these materials results in a higher tensile strength and rut resistance when compared with the control (with virgin aggregate). According to the cost-benefit analysis result, when the three recycled materials are used for an HMA overlay over an existing aged pavement, it could be 60-80% more cost-effective compared to a conventional HMA overlay, thereby offering significant economical savings each year in the field of road construction.
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- 2024
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17. Quality of Life and Nutritional Outcomes of Stomach-Preserving Surgery for Early Gastric Cancer: A Secondary Analysis of the SENORITA Randomized Clinical Trial.
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Eom BW, Yoon HM, Kim YW, Min JS, An JY, Hur H, Lee YJ, Cho GS, Park YK, Jung MR, Park JH, Hyung WJ, Jeong SH, Kook MC, Han M, Nam BH, and Ryu KW
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- Humans, Male, Female, Middle Aged, Nutritional Status, Aged, Treatment Outcome, Stomach Neoplasms surgery, Quality of Life, Gastrectomy methods, Laparoscopy, Organ Sparing Treatments
- Abstract
Importance: The Sentinel Node Oriented Tailored Approach (SENORITA) randomized clinical trial evaluated quality of life (QoL) and nutritional outcomes between the laparoscopic sentinel node navigation surgery (LSNNS) and laparoscopic standard gastrectomy (LSG). However, there has been no report on the QoL and nutritional outcomes of patients who underwent stomach-preserving surgery among the LSNNS group., Objective: To compare long-term QoL and nutritional outcomes between patients who underwent stomach-preserving surgery and those who underwent standard gastrectomy and to identify factors associated with poor QoL outcomes in patients who underwent stomach-preserving surgery., Design, Setting, and Participants: This study is a secondary analysis of the SENORITA trial, a randomized clinical trial comparing LSNNS with LSG. Patients from 7 tertiary or general hospitals across the Republic of Korea were enrolled from March 2013 to December 2016, with follow-up through 5 years. Data were analyzed between August and September 2022. Among trial participants, patients who underwent actual laparoscopic standard gastrectomy in the LSG group and those who underwent stomach-preserving surgery in the LSNNS group were included. Patients who did not complete the baseline or any follow-up questionnaire were excluded., Intervention: Stomach-preserving surgery vs standard gastrectomy., Main Outcomes and Measures: Overall European Organization for Research and Treatment of Cancer QoL Questionnaire Core 30 (EORTC QLQ-C30) and stomach module (STO22) scores, body mass index, hemoglobin, protein, and albumin levels., Results: A total of 194 and 257 patients who underwent stomach-preserving surgery and standard gastrectomy, respectively, were included in this study (mean [SD] age, 55.6 [10.6] years; 249 [55.2%] male). The stomach-preserving group had better QoL scores at 3 months postoperatively in terms of physical function (87.2 vs 83.9), dyspnea (5.9 vs 11.2), appetite loss (13.1 vs 19.4), dysphagia (8.0 vs 12.7), eating restriction (10.9 vs 18.2), anxiety (29.0 vs 35.2), taste change (7.4 vs 13.0), and body image (19.5 vs 27.2). At 1 year postoperatively, the stomach-preserving group had significantly higher body mass index (23.9 vs 22.1, calculated as weight in kilograms divided by height in meters squared) and hemoglobin (14.3 vs 13.3 g/dL), albumin (4.3 vs 4.25 g/dL), and protein (7.3 vs 7.1 g/dL) levels compared to the standard group. Multivariable analyses showed that tumor location (greater curvature, lower third) was favorably associated with global health status (β, 10.5; 95% CI, 3.2 to 17.8), reflux (β, -8.4; 95% CI, -14.7 to -2.1), and eating restriction (β, -5.7; 95% CI, -10.3 to -1.0) at 3 months postoperatively in the stomach-preserving group. Segmental resection was associated with risk of diarrhea (β, 40.6; 95% CI, 3.1 to 78.1) and eating restriction (β, 15.1; 95% CI, 1.1 to 29.1) at 3 years postoperatively., Conclusions and Relevance: Stomach-preserving surgery after sentinel node evaluation was associated with better long-term QoL and nutritional outcomes than standard gastrectomy. These findings may help facilitate decision-making regarding treatment for patients with early-stage gastric cancer., Trial Registration: ClinicalTrials.gov Identifier: NCT01804998.
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- 2024
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18. The Survival and Financial Benefit of Investigator-Initiated Trials Conducted by Korean Cancer Study Group.
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Kim BJ, Maeng CH, Keam B, Im YH, Ro J, Jung KH, Im SA, Kim TW, Lee JL, Heo DS, Kim SW, Park K, Ahn MJ, Cho BC, Kim HK, Kang YK, Cho JY, Yun HJ, Nam BH, and Zang DY
- Abstract
Purpose: The Korean Cancer Study Group (KCSG) is a nationwide cancer clinical trial group dedicated to advancing investigator-initiated trials (IITs) by conducting and supporting clinical trials. This study aims to review IITs conducted by KCSG and quantitatively evaluate the survival and financial benefits of IITs for patients., Materials and Methods: We reviewed IITs conducted by KCSG from 1998 to 2023, analyzing progression-free survival (PFS) and overall survival (OS) gains for participants. PFS and OS benefits were calculated as the difference in median survival times between the intervention and control groups, multiplied by the number of patients in the intervention group. Financial benefits were assessed based on the cost of investigational products provided., Results: From 1998 to 2023, KCSG conducted 310 IITs, with 133 completed and published. Of these, 21 were included in the survival analysis. The analysis revealed that 1,951 patients in the intervention groups gained a total of 2,558.4 months (213.2 years) of PFS and 2,501.6 months (208.5 years) of OS, with median gains of 1.31 months in PFS and 1.58 months in OS per patient. When analyzing only statistically significant results, PFS and OS gain per patients was 1.69 months and 3.02 months, respectively. Investigational drug cost analysis from 6 available IITs indicated that investigational products provided to 252 patients were valued at 10,400,077,294 won (approximately 8,046,481 US dollars), averaging about 41,270,148 won (approximately 31,930 US dollars) per patient., Conclusion: Our findings, based on analysis of published research, suggest that IITs conducted by KCSG led to survival benefits for participants and, in some studies, may have provided financial benefits by providing investment drugs.
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- 2024
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19. Phase III, Randomized Study of Atezolizumab Plus Bevacizumab and Chemotherapy in Patients With EGFR - or ALK -Mutated Non-Small-Cell Lung Cancer (ATTLAS, KCSG-LU19-04).
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Park S, Kim TM, Han JY, Lee GW, Shim BY, Lee YG, Kim SW, Kim IH, Lee S, Kim YJ, Park JH, Park SG, Lee KH, Kang EJ, Kim JW, Shin SH, Ock CY, Nam BH, Lee J, Jung HA, Sun JM, Lee SH, Ahn JS, and Ahn MJ
- Subjects
- Humans, Bevacizumab, Carboplatin, B7-H1 Antigen therapeutic use, Pemetrexed therapeutic use, ErbB Receptors genetics, Receptor Protein-Tyrosine Kinases therapeutic use, Antineoplastic Combined Chemotherapy Protocols adverse effects, Carcinoma, Non-Small-Cell Lung drug therapy, Carcinoma, Non-Small-Cell Lung genetics, Lung Neoplasms drug therapy, Lung Neoplasms genetics, Antibodies, Monoclonal, Humanized
- Abstract
Purpose: In the treatment of non-small-cell lung cancer (NSCLC) with a driver mutation, the role of anti-PD-(L)1 antibody after tyrosine kinase inhibitor (TKI) remains unclear. This randomized, open-label, multicenter, phase III study evaluates the efficacy of atezolizumab plus bevacizumab, paclitaxel, and carboplatin (ABCP ) in EGFR- or ALK -mutated NSCLC that progressed before TKI therapy., Materials and Methods: We compared the clinical efficacy of ABCP followed by maintenance therapy with atezolizumab plus bevacizumab with pemetrexed plus carboplatin or cisplatin (PC) followed by pemetrexed maintenance. The primary end point was progression-free survival (PFS)., Results: A total of 228 patients with activating EGFR mutation (n = 215) or ALK translocation (n = 13) were enrolled from 16 sites in the Republic of Korea and randomly assigned at 2:1 ratio to either ABCP (n = 154) or PC arm (n = 74). The median follow-up duration was 26.1 months (95% CI, 24.7 to 28.2). Objective response rates (69.5% v 41.9%, P < .001) and median PFS (8.48 v 5.62 months, hazard ratio [HR], 0.62 [95% CI, 0.45 to 0.86]; P = .004) were significantly better in the ABCP than PC arm. PFS benefit increased as PD-L1 expression increased, with an HR of 0.47, 0.41, and 0.24 for PD-L1 ≥1%, ≥10%, and ≥50%, respectively. Overall survival was similar between ABCP and PC arm (20.63 v 20.27 months, HR, 1.01 [95% CI, 0.69 to 1.46]; P = .975). The safety profile of the ABCP arm was comparable with that previously reported, with no additional safety signals, but higher rates of treatment-related adverse events were observed compared with the PC arm., Conclusion: To our knowledge, this study is the first randomized phase III study to demonstrate the clinical benefit of anti-PD-L1 antibody in combination with bevacizumab and chemotherapy in patients with EGFR- or ALK -mutated NSCLC who have progressed on relevant targeted therapy.
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- 2024
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20. Personalized Biomarker-Based Umbrella Trial for Patients With Recurrent or Metastatic Head and Neck Squamous Cell Carcinoma: KCSG HN 15-16 TRIUMPH Trial.
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Keam B, Hong MH, Shin SH, Heo SG, Kim JE, Ahn HK, Lee YG, Park KU, Yun T, Lee KW, Kim SB, Lee SC, Kim MK, Cho SH, Oh SY, Park SG, Hwang S, Nam BH, Kim S, Kim HR, and Yun HJ
- Subjects
- Humans, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Biomarkers, Neoplasm Recurrence, Local drug therapy, Neoplasm Recurrence, Local genetics, Platinum therapeutic use, Squamous Cell Carcinoma of Head and Neck drug therapy, Squamous Cell Carcinoma of Head and Neck genetics, Antineoplastic Agents therapeutic use, Head and Neck Neoplasms drug therapy, Head and Neck Neoplasms genetics
- Abstract
Purpose: A precise oncologic approach for head and neck squamous cell carcinoma (HNSCC) is necessary. We performed a genomic profile-based umbrella trial for the patients with platinum-refractory recurrent and/or metastatic HNSCC., Methods: In this multicenter, open-label, single-arm phase II trial, we performed targeted next-generation sequencing (NGS). Patients were assigned to each treatment arm on the basis of their matching genomic profiles: arm 1, alpelisib, a PIK3CA inhibitor; arm 2, poziotinib, an epidermal growth factor receptor/HER2 inhibitor; arm 3, nintedanib, an fibroblast growth factor receptor inhibitor; and arm 4, abemaciclib, a CDK4/6 inhibitor. If there was no matching target, patients were allocated to arm 5, duvalumab ± tremelimumab, anti-PD-L1/cytotoxic T-cell lymphocyte-4 inhibitor. When progressive disease (PD) occurred in arms 1-4, cross over to arm 5 was allowed. The primary end point was disease control rate (DCR) in arm 1 and overall response rate (ORR) in arms 2-5 by investigator assessment., Results: Between October 2017 and August 2020, 203 patients were enrolled, including crossover. In arm 1, the ORR was 21.2% and DCR was 65.6%. The ORR was 0% for arm 2, 42.9% for arm 3, 0% for arm 4, and 15.6% for arm 5. In the case of PD with durvalumab, tremelimumab was added, and the ORR for durvalumab + tremelimumab was 2.2%. The median progression-free survival was 3.4, 3.2, 5.6, 1.6, and 1.7 months for each arm, respectively. The median overall survival was 12.4, 6.1, 11.1, 9.1, and 12.7 months, respectively. Overall, the toxicity profiles were manageable, and there were no treatment-related deaths., Conclusion: To our knowledge, this study is the first biomarker-driven umbrella trial for platinum-refractory HNSCC using matched molecular targeted agents. We found that NGS-based genomic phenotyping was methodologically feasible and applicable.
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- 2024
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21. Clinical Efficacy of Laparoscopic Sentinel Node Navigation Surgery for Stomach Preservation in Patients With Early Gastric Cancer: 5-year Results of the SENORITA Trial.
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Hur H, Lee YJ, Kim YW, Min JS, Yoon HM, Yeong An J, Eom BW, Seok Cho G, Park YK, Jung MR, Park JH, Hyung WJ, Jeong SH, Kook MC, Han M, Nam BH, and Ryu KW
- Abstract
Objective: This study aimed to compare laparoscopic standard gastrectomy (LSG) and laparoscopic sentinel node navigation surgery (LSNNS) for EGC in terms of 5-year long-term oncologic outcomes., Summary Background Data: The oncological safety of LSNNS for early gastric cancer (EGC) has not been confirmed. Three-year disease-free survival (DFS), which is the primary endpoint of the phase III multicenter randomized controlled clinical trial (SEntinel Node ORIented Tailored Approach [SENORITA] trial), did not show the non-inferiority of LSNNS relative to LSG., Methods: The SENORITA trial, a multicenter randomized clinical trial, was designed to show that LSNNS is non-inferior to LSG in terms of 3-year DFS. In the present study, we collected 5-year follow-up data from 527 patients recruited in the SENORITA trial as the full analysis set (FAS). Disease-free survival (DFS), overall survival (OS), disease-specific survival (DSS), and recurrence patterns were evaluated using the FAS of both LSG (n=269) and LSNNS (n=258)., Results: The 5-year DFS was not significantly different between the LSG and LSNNS groups (P=0.0561). During the 5-year follow-up, gastric cancer-related events, such as metachronous cancer, were more frequent in the LSNNS group than in the LSG group. However, ten recurrent cancers in the remnant stomach of both groups were curatively resected by additional gastrectomy and one by additional endoscopic resection. Two of the 198 patients who underwent local resection for stomach preservation based on the LSNNS results developed distant metastasis. However, there was no statistically significant difference in the 5-year OS and DSS (P=0.7403 and P=0.9586, respectively) between the two groups., Conclusion: The 5-year DFS, DSS and OS did not differ significantly between the two groups. Considering the benefits of LSNNS on postoperative quality of life, LSNNS could be recommended as an alternative treatment option for EGC., Competing Interests: Conflict of Interest Disclosure: Dr. Hyung received grants from Medtronic and GC Pharma, stocks from Hutom, and personal fees from SK Hynix (Wuxi, China) outside of the submitted work. No other disclosures are reported., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
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- 2024
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22. Study on the Combined Effect of Municipal Solid Waste Incineration Bottom Ash and Waste Shingle in Hot Mix Asphalt.
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Park K, Golestani B, Nam BH, Hou J, and Eun J
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This study investigated the positive effect of the combined use of recycled asphalt shingles (RASs) and municipal solid waste incineration (MSWI) bottom ash (B.A.) in asphalt concrete, which contributes to enhanced sustainability in pavement engineering. In addition, unlike traditional approaches that employ individual recycling material in hot mix asphalt (HMA), the combined use of the two waste materials maximizes the mechanical performance of the asphalt mixture. The addition of RAS (with 30-40% aged binder) as an additive generally enhances the strength/stiffness of the asphalt mixture. The high porosity/absorption of MSWI BA results in an additional amount of liquid asphalt binder in the mixture. As an admixture, RAS could supply the additional asphalt binder in the mixture when MSWI BA is used as an aggregate replacement. This research was conducted in two phases: (1) to examine the effect of MSWI BA alone and its optimal asphalt content (OAC), and (2) to assess the combined effect of B.A. and RAS in HMA. Multiple laboratory testing methods were employed for the mechanical performance investigation, including the Marshall stability test, rutting test, and indirect tensile test. The testing results show that the 20% B.A. replacement exhibits the best performance and that it requires an additional asphalt binder of 1.1%. For the combined use of MSWI BA and RAS, 5% RAS shows the best mechanical performance. All mixtures that contain the B.A. and RAS show greater strength than the control specimen (regular HMA).
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- 2023
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23. Chromosome-level genome assembly of chub mackerel (Scomber japonicus) from the Indo-Pacific Ocean.
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Lee YH, Abueg L, Kim JK, Kim YW, Fedrigo O, Balacco J, Formenti G, Howe K, Tracey A, Wood J, Thibaud-Nissen F, Nam BH, No ES, Kim HR, Lee C, Jarvis ED, and Kim H
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- Animals, Chromosomes, Pacific Ocean, Cyprinidae genetics, Genome, Perciformes genetics
- Abstract
Chub mackerels (Scomber japonicus) are a migratory marine fish widely distributed in the Indo-Pacific Ocean. They are globally consumed for their high Omega-3 content, but their population is declining due to global warming. Here, we generated the first chromosome-level genome assembly of chub mackerel (fScoJap1) using the Vertebrate Genomes Project assembly pipeline with PacBio HiFi genomic sequencing and Arima Hi-C chromosome contact data. The final assembly is 828.68 Mb with 24 chromosomes, nearly all containing telomeric repeats at their ends. We annotated 31,656 genes and discovered that approximately 2.19% of the genome contained DNA transposon elements repressed within duplicated genes. Analyzing 5-methylcytosine (5mC) modifications using HiFi reads, we observed open/close chromatin patterns at gene promoters, including the FADS2 gene involved in Omega-3 production. This chromosome-level reference genome provides unprecedented opportunities for advancing our knowledge of chub mackerels in biology, industry, and conservation., (© 2023. The Author(s).)
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- 2023
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24. A Phase 3 Randomized Clinical Trial to Compare Efficacy and Safety between Combination Therapy and Monotherapy in Elderly Patients with Advanced Gastric Cancer (KCSG ST13-10).
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Lee KW, Zang DY, Ryu MH, Han HS, Kim KH, Kim MJ, Koh SA, Lee SS, Koo DH, Ko YH, Sohn BS, Kim JW, Park JH, Nam BH, and Choi IS
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- Aged, Humans, Capecitabine, Oxaliplatin adverse effects, Cisplatin, Neoplasm Recurrence, Local drug therapy, Fluorouracil adverse effects, Antineoplastic Combined Chemotherapy Protocols adverse effects, Molecular Chaperones therapeutic use, Tumor Suppressor Proteins, Stomach Neoplasms pathology
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Purpose: This study evaluated whether combination therapy is more effective than monotherapy in elderly patients with metastatic or recurrent gastric cancer (MRGC) as first-line chemotherapy., Materials and Methods: Elderly (≥ 70 years) chemo-naïve patients with MRGC were allocated to receive either combination therapy (group A: 5-fluorouracil [5-FU]/oxaliplatin, capecitabine/oxaliplatin, capecitabine/cisplatin, or S-1/cisplatin) or monotherapy (group B: 5-FU, capecitabine, or S-1). In group A, starting doses were 80% of standard doses, and they could be escalated to 100% at the discretion of the investigator. Primary endpoint was to confirm superior overall survival (OS) of combination therapy vs. monotherapy., Results: After 111 of the planned 238 patients were randomized, enrollment was terminated due to poor accrual. In the full-analysis population (group A [n=53] and group B [n=51]), median OS of combination therapy vs. monotherapy was 11.5 vs. 7.5 months (hazard ratio [HR], 0.86; 95% confidence interval [CI], 0.56 to 1.30; p=0.231). Median progression-free survival (PFS) was 5.6 vs. 3.7 months (HR, 0.53; 95% CI, 0.34 to 0.83; p=0.005). In subgroup analyses, patients aged 70-74 years tended to have superior OS with combination therapy (15.9 vs. 7.2 months, p=0.056). Treatment-related adverse events (TRAEs) occurred more frequently in group A vs. group B. However, among severe TRAEs (≥ grade 3), there were no TRAEs with a frequency difference of > 5%., Conclusion: Combination therapy was associated with numerically improved OS, although statistically insignificant, and a significant PFS benefit compared with monotherapy. Although combination therapy showed more frequent TRAEs, there was no difference in the frequency of severe TRAEs.
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- 2023
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25. Molecular mechanisms underlying the vulnerability of Pacific abalone (Haliotis discus hannai) to Vibrio harveyi infection at higher water temperature.
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Lee Y, Roh H, Kim A, Park J, Lee JY, Kim YJ, Kang YR, Kang H, Kim S, Kim HS, Cha HJ, Choi YH, Nam BH, Park CI, and Kim DH
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- Animals, Temperature, Vibrio physiology, Gastropoda genetics, Vibrio Infections
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Climate change is one of the most important threats to farmed abalone worldwide. Although abalone is more susceptible to vibriosis at higher water temperatures, the molecular mode of action underlying this has not been fully elucidated. Therefore, this study aimed to address the high susceptibility of Halitotis discus hannai to V. harveyi infection using abalone hemocytes exposed to low and high temperatures. Abalone hemocytes were divided into four groups, 20C, 20 V, 25C, and 25 V, depending on co-culture with (V)/without (C) V. harveyi (MOI = 12.8) and incubation temperature (20 °C or 25 °C). After 3 h of incubation, hemocyte viability and phagocytic activity were measured, and RNA sequencing was performed using Illumina Novaseq. The expression of several virulence-related genes in V. harveyi was analyzed using real-time PCR. The viability of hemocytes was significantly decreased in the 25 V group compared to cells in the other groups, whereas phagocytic activity at 25 °C was significantly higher than at 20 °C. Although a number of immune-associated genes were commonly upregulated in abalone hemocyte exposed to V. harveyi, regardless of temperature, pathways and genes regarding pro-inflammatory responses (interleukin-17 and tumor necrosis factor) and apoptosis were significantly overexpressed in the 25 V group compared to the 25C group. Notably, in the apoptosis pathway, genes encoding executor caspases (casp3 and casp7) and pro-apoptotic factor, bax were significantly up-regulated only in the 25 V group, while the apoptosis inhibitor, bcl2L1 was significantly up-regulated only in the 20 V group compared to the control group at the respective temperatures. The co-culture of V. harveyi with abalone hemocytes at 25 °C up-regulated several virulence-related genes involved in quorum sensing (luxS), antioxidant activity (katA, katB, and sodC), motility (flgI), and adherence/invasion (ompU) compared to those at 20 °C. Therefore, our results showed that H. discus hannai hemocytes exposed to V. harveyi at 25 °C were highly stressed by vigorously activated inflammatory responses and that the bacterial pathogen overexpressed several virulence-related genes at the high temperature tested. The transcriptomic profile of both abalone hemocytes and V. harveyi in the present study provide insight into differential host-pathogen interactions depending on the temperature conditions and the molecular backgrounds related to increased abalone vulnerability upon global warming., Competing Interests: Declaration of competing interest The authors declare no competing financial interests., (Copyright © 2023 Elsevier Ltd. All rights reserved.)
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- 2023
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26. Randomized phase II study of capecitabine plus cisplatin with or without sorafenib in patients with metastatic gastric cancer (STARGATE).
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Ryu MH, Lee KH, Shen L, Yeh KH, Yoo C, Hong YS, Park YI, Yang SH, Shin DB, Zang DY, Kang WK, Chung IJ, Kim YH, Ryoo BY, Nam BH, Park YS, and Kang YK
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- Humans, Capecitabine adverse effects, Cisplatin adverse effects, Sorafenib therapeutic use, Disease Progression, Antineoplastic Combined Chemotherapy Protocols adverse effects, Treatment Outcome, Stomach Neoplasms pathology
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Background: In this randomized phase II study, we evaluated the efficacy and safety of sorafenib in combination with capecitabine and cisplatin (XP) as first-line chemotherapy in advanced gastric cancer., Patients and Methods: Patients with metastatic gastric or gastroesophageal junction adenocarcinoma were randomized (1:1) to receive either sorafenib plus XP (S + XP) or XP alone. In cases of disease progression in the XP arm, crossover to sorafenib alone was allowed. The primary endpoint was progression-free survival (PFS). The secondary endpoints included overall survival (OS), response rates, safety profiles, and biomarkers, and the response rates and PFS with secondline sorafenib alone after progression in the XP arm., Results: Between Jan 2011 and Feb 2013, a total of 195 patients were accrued (97 in the S + XP arm and 98 in the XP alone arm). The overall response rate was 54% with S + XP, and 52% with XP alone (p = 0.83). With a median follow-up of 12.6 months (range, 0.1-29.2), the median PFS assessed by independent review was 5.6 months in the S + XP arm and 5.3 months in the XP arm (hazard ratio [HR] 0.92, 95% confidence interval [CI] 0.67-1.27, p = 0.61). Overall survival was not different between the two arms (median 11.7 vs. 10.8 months; HR 0.93, 95% CI 0.65-1.31, p = 0.66). Frequencies of grade 3/4 toxicities were similar between the S + XP and XP alone arms, except for neutropenia (21% vs. 37%), anorexia (0% vs. 5%), and hand-foot skin reaction (7% vs. 1%). Among 51 patients who crossed over to sorafenib alone after disease progression in the XP arm, there was no objective response and their median PFS was 1.3 months (95% CI, 1.2-1.7)., Conclusion: The addition of sorafenib to XP chemotherapy was safe but not more effective than XP alone for first-line treatment of metastatic gastric cancer., (© 2022 The Authors. Cancer Medicine published by John Wiley & Sons Ltd.)
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- 2023
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27. Genotyping of Haliotis discus hannai and machine learning models to predict the heat resistant phenotype based on genotype.
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Noh ES, Subramaniyam S, Cho S, Kim YO, Park CJ, Lee JH, Nam BH, and Shin Y
- Abstract
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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- 2023
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28. Collective Resilience and Coping Mechanisms Among International Faculty Members Amid Snap Lockdowns During the Delta and Omicron Variant Outbreaks in East China.
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Nam BH and English AS
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This study explores international faculty members' resilience and the active challenges to establishing coping mechanisms while facing a mental health crisis provoked by the Delta and Omicron lockdowns in China. Grounded in a qualitative approach, this study used a transcendental phenomenological methodology to examine 16 international faculty members affiliated with higher education institutions in Shanghai, Hangzhou, and Nanjing. The findings showed that participants had various mental health issues amid snap lockdowns and persistent nucleic acid application tests. They perceived the most influential sources of coping mechanisms to be (a) social and emotional support; (b) prosocial behavior; and (c) engagement with the public and social services alongside the domestic faculty members. This study emphasizes the significance of collective resilience and prosocial behaviors, calling on future scholars to pay more attention to the host group's cultural values and community resilience as coping mechanisms during the public health crisis provoked by the pandemic.
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- 2023
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29. Social cognitive career theory: The experiences of Korean college student-athletes on dropping out of male team sports and creating pathways to empowerment.
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Nam BH and Marshall RC
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The South Korean elite sport system is facing a wide range of problems that account for the high dropout rate among college student-athletes. However, research on dropout rates of student-athletes is so far been limited, which amplifies the actual voices of this group, their dropout experiences, and their challenges, while they were in the career transition process. Therefore, this study used a critical phenomenological approach as a primary methodological lens to gather information on 15 formal Korean male college student-athletes on dropping out of team sports, exploring their life challenges during their career transitions out of the sport. The result showed two main thematic categories with sub-themes, which include (1) factors affecting burning out and terminating athletic careers: (a) injury and failure of rehabilitation and (b) bullying and abandonment; and (2) factors hindering post-retirement career advancement: (a) prejudice and exclusion and (b) absence of mentors and counselors. This study used Social Cognitive Career Theory to explore the participants' progression through specific interventions that engage and empower. Overall, the current study calls upon researchers, counselors, and administrators to continue exploring advocacy efforts with this population to alter policy and practice., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Nam and Marshall.)
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- 2022
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30. Trauma-Informed Care: A Transcendental Phenomenology of the Experiences of International Faculty during the Delta and Omicron Variant Outbreaks in East China.
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Nam BH and English AS
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- China epidemiology, Disease Outbreaks, Faculty, Grief, Humans, Burnout, Professional epidemiology, Burnout, Professional psychology
- Abstract
This transcendental phenomenological study explored psychologically traumatic incidents and risk factors among international faculty members (IFMs) who experienced long-term lockdowns during the Delta and Omicron outbreak periods in East China. Based on empirical voices from 18 IFMs in Shanghai, Hangzhou, and Nanjing, this study used trauma-informed care as its primary theoretical lens to examine potential traumatic incidents and risk factors. Findings showed that participants had neuroses about the omen of lockdowns and felt exhausted and frustrated about persistent polymerase chain reaction (PCR) tests. They also experienced or witnessed burnout and dropout due to leisure constraints. Most notably, participants had concerns about families and friends during the series of lockdowns, entailing extreme stress due to separation, illness, loss, and grief. Overall, this study provides practical implications for counseling practices about social and cultural considerations and systemic barriers that impact clients' well-being.
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- 2022
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31. Characterization of TRIM16, a member of the fish-specific finTRIM family, in olive flounder Paralichthys olivaceus.
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Cho JY, Kim J, Kim JW, Lee D, Kim DG, Kim YS, Lee JH, Nam BH, Kim YO, and Kong HJ
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- Animals, Female, Phylogeny, RNA, Messenger metabolism, Fish Diseases, Flounder, Novirhabdovirus physiology
- Abstract
Tripartite motif-containing (TRIM) proteins are conserved throughout the metazoan kingdom, and the TRIM subset finTRIM is highly diversified in fish. We isolated TRIM16 cDNA, a member of the finTRIM family, from the olive flounder Paralichthys olivaceus (PoTRIM16). PoTRIM16 contained a 1,725-bp coding sequence encoding a 574-amino acid polypeptide, which in turn contained a really interesting new gene (RING) finger domain, B-box-type zinc finger (B-BOX), nuclease SbcCD subunit C (SbcC), structural maintenance of chromosome (SMC prok B), and stonustoxin (SNTX) subunit alpha (SPRY-PRY-SNTX). Multiple alignment of related sequences revealed that PoTRIM16 showed 86.63-97.40% identity with fish orthologues, and a phylogenetic tree was constructed of vertebrates. PoTRIM16 mRNA was detected in all tissues examined; levels were highest in the eye and ovary. PoTRIM16 mRNA expression was investigated during early development. Under VHSV infection, PoTRIM16 mRNA was downregulated in the liver of P. olivaceus. This is the first study to characterize fish-specific finTRIM in P. olivaceus, which may play a role in the immune response against virus infection., (Copyright © 2022 Elsevier Ltd. All rights reserved.)
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- 2022
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32. The 'Myth of Zero-COVID' Nation: A Digital Ethnography of Expats' Survival Amid Shanghai Lockdown during the Omicron Variant Outbreak.
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Nam BH, Weber HL, Liu Y, and English AS
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- Anthropology, Cultural, China epidemiology, Communicable Disease Control, Disease Outbreaks, Humans, COVID-19 epidemiology, SARS-CoV-2
- Abstract
This study presents a digital ethnography of expats' survival amid the Shanghai lockdown during the Omicron variant outbreak. This study drew insights from studies on resilience and secondary coping within the context of global migration to comprehend the diverse emotional challenges faced by expats in a series of lockdowns and persistent nucleic acid amplification tests. Thus, this study asks what the major emotional challenges expats faced and what sources of social support they could draw from citizens in their host country during the Shanghai lockdown. Accordingly, this study collected WeChat group conversations to draw empirical findings, promoted scholarly conversations about fundamental survival necessity, and traced the process for establishing intercultural collective resilience with citizens from their host country. Overall, this study emphasized the significance of host country members who can promote certain coping mechanisms for their visitors in the specific regional and geographical context of China.
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- 2022
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33. Laparoscopic Sentinel Node Navigation Surgery for Stomach Preservation in Patients With Early Gastric Cancer: A Randomized Clinical Trial.
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Kim YW, Min JS, Yoon HM, An JY, Eom BW, Hur H, Lee YJ, Cho GS, Park YK, Jung MR, Park JH, Hyung WJ, Jeong SH, Kook MC, Han M, Nam BH, and Ryu KW
- Subjects
- Gastrectomy adverse effects, Humans, Neoplasm Recurrence, Local etiology, Postoperative Complications etiology, Quality of Life, Retrospective Studies, Treatment Outcome, Laparoscopy adverse effects, Stomach Neoplasms pathology
- Abstract
Purpose: To compare postoperative complications, long-term survival, and quality of life (QOL) after laparoscopic sentinel node navigation surgery (LSNNS) and laparoscopic standard gastrectomy (LSG)., Methods: Five hundred eighty patients with preoperatively diagnosed stage IA gastric adenocarcinoma (≤ 3 cm) were assigned to undergo either LSG or LSNNS. Observers were not blinded to patient grouping. The primary outcome was 3-year disease-free survival (3y-DFS). Secondary outcomes included postoperative complications, QOL, 3-year disease-specific survival (3y-DSS), and 3-year overall survival (3y-OS)., Results: In total, 527 patients were included in the modified intention-to-treat analysis population for the primary outcome (LSG, 269; LSNNS, 258). Stomach-preserving surgery was performed in 210 patients (81%) in the LSNNS group. During the median follow-up duration, the 3y-DFS rates in the LSG and LSNNS groups were 95.5% and 91.8%, respectively (difference: 3.7%; 95% CI, -0.6 to 8.1). Three patients with recurrence and five with metachronous gastric cancer in the LSNNS group underwent standard surgery. Two patients with distant metastasis in both groups were treated with palliative chemotherapy. The 3y-DSS and 3y-OS rates in the LSG and LSNNS groups were 99.5% and 99.1% ( P = .59) and 99.2% and 97.6% ( P = .17), respectively. Postoperative complications occurred in 19.0% of the LSG group and 15.5% of the LSNNS group ( P = .294). The LSNNS group showed better physical function ( P = .015), less symptoms ( P < .001), and improved nutrition than the LSG group., Conclusion: LSNNS did not show noninferiority to LSG for 3y-DFS, with a 5% margin. However, the 3y-DSS and 3y-OS were not different after rescue surgery in cases of recurrence/metachronous gastric cancer, and LSNNS had better long-term QOL and nutrition than LSG.
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- 2022
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34. Survival After Hyperthermic Intraperitoneal Chemotherapy and Primary or Interval Cytoreductive Surgery in Ovarian Cancer: A Randomized Clinical Trial.
- Author
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Lim MC, Chang SJ, Park B, Yoo HJ, Yoo CW, Nam BH, and Park SY
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- Antineoplastic Combined Chemotherapy Protocols therapeutic use, Carcinoma, Ovarian Epithelial drug therapy, Carcinoma, Ovarian Epithelial surgery, Combined Modality Therapy, Cytoreduction Surgical Procedures methods, Female, Humans, Hyperthermic Intraperitoneal Chemotherapy, Middle Aged, Single-Blind Method, Hyperthermia, Induced, Ovarian Neoplasms drug therapy
- Abstract
Importance: Ovarian cancer has the highest mortality rate among gynecologic malignant tumors. Data are lacking on the survival benefit of hyperthermic intraperitoneal chemotherapy (HIPEC) in women with ovarian cancer who underwent primary or interval cytoreductive surgery., Objective: To assess the clinical benefit of HIPEC after primary or interval maximal cytoreductive surgery in women with stage III or IV primary advanced ovarian cancer., Design, Setting, and Participants: In this single-blind randomized clinical trial performed at 2 institutions in South Korea from March 2, 2010, to January 22, 2016, a total of 184 patients with stage III or IV ovarian cancer with residual tumor size less than 1 cm were randomized (1:1) to a HIPEC (41.5 °C, 75 mg/m2 of cisplatin, 90 minutes) or control group. The primary end point was progression-free survival. Overall survival and adverse events were key secondary end points. The date of the last follow-up was January 10, 2020, and the data were locked on February 17, 2020., Exposures: Hyperthermic intraperitoneal chemotherapy after cytoreductive surgery., Main Outcomes and Measures: Progression-free and overall survival., Results: Of the 184 Korean women who underwent randomization, 92 were randomized to the HIPEC group (median age, 52.0 years; IQR, 46.0-59.5 years) and 92 to the control group (median age, 53.5 years; IQR, 47.5-61.0 years). After a median follow-up of 69.4 months (IQR, 54.4-86.3 months), median progression-free survival was 18.8 months (IQR, 13.0-43.2 months) in the control group and 19.8 months (IQR, 13.7-55.4 months) in the HIPEC group (P = .43), and median overall survival was 61.3 months (IQR, 34.3 months to not reported) in the control group and 69.5 months (IQR, 45.6 months to not reported) in the HIPEC group (P = .52). In the subgroup of interval cytoreductive surgery after neoadjuvant chemotherapy, the median progression-free survival was 15.4 months (IQR, 10.6-21.1 months) in the control group and 17.4 months (IQR, 13.8-31.5 months) in the HIPEC group (hazard ratio for disease progression or death, 0.60; 95% CI, 0.37-0.99; P = .04), and the median overall survival was 48.2 months (IQR, 33.8-61.3 months) in the control group and 61.8 months (IQR, 46.7 months to not reported) in the HIPEC group (hazard ratio, 0.53; 95% CI, 0.29-0.96; P = .04). In the subgroup of primary cytoreductive surgery, median progression-free survival was 29.7 (IQR, 17.2-90.1 months) in the control group and 23.9 months (IQR, 12.3-71.5 months) in the HIPEC group, and the median overall survival was not reached in the control group and 71.3 months (IQR, 45.6 months to not reported) in the HIPEC group., Conclusions and Relevance: The addition of HIPEC to cytoreductive surgery did not improve progression-free and overall survival in patients with advanced epithelial ovarian cancer. Although the results are from a subgroup analysis, the addition of HIPEC to interval cytoreductive surgery provided an improvement of progression-free and overall survival., Trial Registration: ClinicalTrials.gov Identifier: NCT01091636.
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- 2022
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35. A risk scoring system to predict progression to severe pneumonia in patients with Covid-19.
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Lee JY, Nam BH, Kim M, Hwang J, Kim JY, Hyun M, Kim HA, and Cho CH
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- Cohort Studies, Humans, Logistic Models, Risk Factors, COVID-19, Pneumonia epidemiology
- Abstract
Rapid outbreak of coronavirus disease 2019 (Covid-19) raised major concern regarding medical resource constraints. We constructed and validated a scoring system for early prediction of progression to severe pneumonia in patients with Covid-19. A total of 561 patients from a Covid-19 designated hospital in Daegu, South Korea were randomly divided into two cohorts: development cohort (N = 421) and validation cohort (N = 140). We used multivariate logistic regression to identify four independent risk predictors for progression to severe pneumonia and constructed a risk scoring system by giving each factor a number of scores corresponding to its regression coefficient. We calculated risk scores for each patient and defined two groups: low risk (0 to 8 points) and high risk (9 to 20 points). In the development cohort, the sensitivity and specificity were 83.8% and 78.9%. In the validation cohort, the sensitivity and specificity were 70.8% and 79.3%, respectively. The C-statistics was 0.884 (95% CI 0.833-0.934) in the development cohort and 0.828 (95% CI 0.733-0.923) in the validation cohort. This risk scoring system is useful to identify high-risk group for progression to severe pneumonia in Covid-19 patients and can prevent unnecessary overuse of medical care in limited-resource settings., (© 2022. The Author(s).)
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- 2022
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36. Social support for international students who faced emotional challenges midst Wuhan's 76-day lockdown during early stage of the COVID-19 pandemic.
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Scott English A, Yang Y, Marshall RC, and Nam BH
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This study is a phenomenological investigation of the emotional challenges of international students experiencing the 76-day lockdown in Wuhan during the early stages of the COVID-19 epidemic in China. This study employed the psychological concepts of stress, fear, and uncertainty to understand international students' risk factors and psychological symptoms during the Wuhan lockdown. Hence, this research assessed (a) the emotional challenges associated with the lockdown and (b) major sources to cope with emotional challenges. The overarching scholarly conversations are about diverse forms of emotional distress, such as stress and anxiety about their physical health and the social support from various sources at host universities and local communities, including students, teachers, administrators, and the students' respective embassies. Overall, the current study has theoretical and practical implications and offers a guideline for administrative practice in international higher education and international student migration., (© 2022 Elsevier Ltd. All rights reserved.)
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- 2022
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37. Randomized Phase II Study of Axitinib versus Observation in Patients with Recurred or Metastatic Adenoid Cystic Carcinoma.
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Kang EJ, Ahn MJ, Ock CY, Lee KW, Kwon JH, Yang Y, Choi YH, Kim MK, Ji JH, Yun T, Nam BH, Kim SB, and Keam B
- Subjects
- Axitinib adverse effects, Humans, Neoplasm Recurrence, Local drug therapy, Prospective Studies, Carcinoma, Adenoid Cystic drug therapy, Carcinoma, Renal Cell drug therapy, Kidney Neoplasms drug therapy
- Abstract
Purpose: The role of chemotherapy in adenoid cystic carcinoma (ACC) is controversial because ACC is usually stable without chemotherapy and the lack of randomized trials. Here, we conducted the first randomized trial to evaluate the efficacy of axitinib as compared with observation in ACC., Patients and Methods: In this multicenter, prospective phase II trial, we enrolled patients with recurrent or metastatic ACC whose cancer had progressed within the past 9 months. Patients were randomly assigned to either axitinib (5 mg twice daily) or observation at a 1:1 ratio. Crossover from observation to axitinib was permitted after progression. The primary endpoint was a 6-month progression-free survival (PFS) rate. The secondary endpoints included objective response rate (ORR), overall survival (OS), PFS, duration of response, and adverse events., Results: Sixty patients were allocated to the axitinib or observation group, with response evaluation conducted in 54 patients. With a median follow-up of 25.4 months, the 6-month PFS rate was 73.0% with axitinib and 23.0% with observation. Median PFS was longer in the axitinib arm (10.8 months vs. 2.8 months, P < 0.001). The ORR of axitinib was 0.0%, but the disease control rate was 100.0% with axitinib and 51.9% with observation. Median OS was not reached with axitinib, but was 27.2 months with observation (P = 0.226). The most frequently reported adverse events for axitinib were oral mucositis and fatigue., Conclusions: In this first randomized trial in patients with ACC, axitinib significantly increased the 6-month PFS rate as compared with observation. (ClinicalTrials.gov number, NCT02859012)., (©2021 American Association for Cancer Research.)
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- 2021
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38. Draft genome of the Korean smelt Hypomesus nipponensis and its transcriptomic responses to heat stress in the liver and muscle.
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Xuan B, Park J, Choi S, You I, Nam BH, Noh ES, Kim EM, Song MY, Shin Y, Jeon JH, and Kim EB
- Subjects
- Animals, Gene Expression Profiling, Heat-Shock Response genetics, Humans, Liver, Muscles, Republic of Korea, Transcriptome, Zebrafish, Osmeriformes genetics
- Abstract
Pond smelt (Hypomesus nipponensis) is a cold-freshwater fish species and a winter economic aquaculture resource in South Korea. Because of its high susceptibility to abnormal water temperature from global warming, a large number of smelt die in hot summers. Here, we present the first draft genome of H. nipponensis and transcriptomic changes in molecular mechanisms or intracellular responses under heat stress. We combined Illumina and PacBio sequencing technologies to generate the draft genome of H. nipponensis. Based on the reference genome, we conducted transcriptome analysis of liver and muscle tissues under normal (NT, 5°C) vs. warm (HT, 23°C) conditions to identify heat stress-induced genes and gene categories. We observed a total of 1987 contigs with N50 of 0.46 Mbp, with the largest contig (3.03 Mbp) in the assembled genome. A total of 20,644 protein-coding genes were predicted, and 19,224 genes were functionally annotated: 15,955 genes for Gene Ontology terms and 11,560 genes for KEGG Orthology. We conducted the lost and gained genes analysis compared with three species that: human, zebrafish, and salmon. In the lost genes analysis, we detected that smelt lost 4461 (22.16%), 2825 (10.62%), and 1499 (3.09%) genes compare with above three species, respectively. In the gained genes analysis, we observed that smelt gained 1133 (5.49%), 1670 (8.09%), and 229 (1.11%) genes compared with the above species, respectively. From transcriptome analysis, a total of 297 and 331 differentially expressed genes (DEGs) with a false discovery rate <0.05 were identified in the liver and muscle tissues, respectively. Gene enrichment analysis of DEGs indicates that upregulated genes were significantly enriched for lipid biosynthetic process (GO:0008610, P < 0.001) and regulation of apoptotic process (GO:0042981, P < 0.01), and genes were downregulated by immune responses such as myeloid cell differentiation (GO:0030099, P < 0.001) in the liver under heat stress. In muscle tissue, upregulated genes were enriched for hypoxia (GO:0001666, P < 0.05), transcription regulator activity (GO:0140110, P < 0.001), and calcium-release channel activity (GO:0015278, P < 0.01), and genes were downregulated for a nicotinamide nucleotide biosynthetic process (GO:0019359, P < 0.01). The results of KEGG pathway analysis were similar to that of gene enrichment analysis. The draft genome and transcriptomic of H. nipponensis will be a useful genetic resource for functional and evolutionary studies. Our findings will improve understanding of molecular mechanisms and heat responses and be useful for predicting survival of the smelt and its closely related species under global warming., (© The Author(s) 2021. Published by Oxford University Press on behalf of Genetics Society of America.)
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- 2021
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39. Antimicrobial Activity and Action Mechanisms of Arg-Rich Short Analog Peptides Designed from the C-Terminal Loop Region of American Oyster Defensin (AOD).
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Seo JK, Kim DG, Lee JE, Park KS, Lee IA, Lee KY, Kim YO, and Nam BH
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- Animals, Aquatic Organisms, Erythrocytes drug effects, Gram-Negative Bacteria drug effects, Gram-Positive Bacteria drug effects, Hemolysis drug effects, Humans, Microbial Sensitivity Tests, Phytotherapy, Anti-Bacterial Agents pharmacology, Defensins pharmacology, Ostreidae
- Abstract
American oyster defensin (AOD) was previously purified from acidified gill extract of the American oyster, Crassostrea virginica . AOD is composed of 38 amino acids with three disulfide bonds and exhibits strong antimicrobial activity against Gram-positive bacteria as well as significant activity against Gram-negative bacteria. Here, to develop promising peptides into antibiotic candidates, we designed five arginine-rich analogs (A0, A1, A2, A3, and A4), predicted their loop and extended strand/random structures-including nine amino acids and a disulfide bond derived from the C-terminus of AOD-and described their antimicrobial and cytotoxic effects, as well as their modes of action. In our experimental results, the A3 and A4 analogs exhibited potent antimicrobial activity against all test organisms-including four Gram-positive bacteria, six Gram-negative bacteria, and Candida albicans -without cell toxicity. A sequence of experiments, including a membrane permeabilization assay, DNA binding study, and DNA polymerization inhibition test, indicated that the two analogs (A3 and A4) possibly did not act directly on the bacterial membrane but instead interacted with intracellular components such as DNA or DNA amplification reactions. AOD analogs also showed strong bacterial inhibition activity in the plasma environment. In addition, analog-treated microbial cells clearly exhibited membrane disruption, damage, and leakage of cytoplasmic contents. Collectively, our results suggest that two analogs, A3 and A4, have potent antimicrobial activity via DNA interaction and have the potential for development into novel antimicrobial agents.
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- 2021
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40. Experimental assessment of cement hydration and leaching characteristics for waste-to-energy bottom ash mixed with concrete.
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An J, Nam BH, Cho BH, and Eun J
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- Construction Materials, Recycling, Solid Waste analysis, Coal Ash, Incineration
- Abstract
To achieve a more sustainable waste-to-energy (WTE) process, the recycling of solid waste incineration (MSWI) bottom ash (BA) has received large attention nowadays. This study investigated how WTE BA form is changed after the hydration and the impacts of WTE BA hydration on its leaching characteristics by using geometrical and leaching tests when incorporated in cement matrix for the recycling. The material composition and characteristics of anhydrous BA, hydrated BA, cement paste, Portland cement concrete (PCC), and BA-combined PCC were evaluated through scanning electron microscopy, X-ray spectroscopy and X-ray diffraction analyses. The results confirmed that the WTE BA newly formed a complex phase of hydration products in a cement matrix. Synthetic precipitation leaching procedure (SPLP) test was also conducted to investigate the leaching behaviors of alkaline components and metals of BA in the crushed BA-PCC samples. Through the leaching study, the leachability of crushed BA-combined concrete was rigorously evaluated when recycled as construction materials (e.g. base, subbase, subdrainage, etc.), which is the worst-case scenario. The results revealed that the release of highly alkaline elements increases with increasing BA content. However, the release of trace metals was reduced by 20-30% significantly when mixed properly with Portland cement concrete (PCC), which is due to both physical and chemical binding in cement hydration products. In addition, the thresholds of water regulations, set by the World Health Organization (WHO) and the Environmental Protection Agency (EPA) of the United States, were assessed as the basis for evaluating the extent of the risk of the leaching of toxic materials. Implications: This study investigated how waste to energy (WTE) bottom ash (BA) form is changed after the hydration and the impacts of WTE BA hydration on its environmental leaching characteristics by using geometrical and leaching tests when incorporated in cement matrix for the recycling. Incorporating of WTE BA in cement mixture can form new mineralogical phases of hydration products in cement matrices such as Copper Hydrogen Arsenate Hydrate and Jahnsite. A significant reduction of alkaline elements (Si, Al, and K) from crushed PCC mixed with WTE BA due to the hydration. The lowest concentrations of major alkaline elements leached from the crushed PCC containing either 10% or 20% of BA contents. The averaged leaching concentration of detected elements is substantially below the water quality guidelines (provided by U.S. EPA and WHO) except Al.
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- 2021
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41. Modulated electro-hyperthermia with weekly paclitaxel or cisplatin in patients with recurrent or persistent epithelial ovarian, fallopian tube or primary peritoneal carcinoma: The KGOG 3030 trial.
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Kim K, Kim JH, Kim SC, Kim YB, Nam BH, No JH, Cho H, Ju W, Suh DH, and Kim YH
- Abstract
The present study (KGOG 3030) aimed to evaluate the safety of modulated electro-hyperthermia (mEHT) therapy with weekly administration of paclitaxel or cisplatin in female patients with recurrent or persistent epithelial ovarian, fallopian tube or primary peritoneal carcinoma. A total of 12 patients were randomized into the paclitaxel or cisplatin arm at a 1:1 ratio. Patients received weekly administration of paclitaxel (70 mg/m
2 ) or cisplatin (40 mg/m2 ) intravenously on days 1, 8 and 15, and underwent mEHT therapy for 1 h on days 1, 4, 8, 11, 15, 18, 21 and 24 for each 4-week cycle. The primary endpoint was the occurrence of dose-limiting toxicity (DLT). The secondary endpoints were treatment-emergent adverse events (TEAEs), objective response rate, carbohydrate antigen 125 (CA125) response rate, progression-free survival (PFS) and overall survival (OS). In total, 16 patients were recruited, but four patients dropped out. None of the 12 remaining patients (6 each in the two arms) experienced DLT. Overall, 0 and 4 grade 3 TEAEs (anemia, nausea, neutrophil count decreased and platelet count decreased) occurred in the paclitaxel and cisplatin arm, respectively. Furthermore, one confirmed partial response and two CA125 responses were observed in the cisplatin arm. The median PFS time in the paclitaxel and cisplatin arms was 3.0 months (range, 1.7-4.6 months) and 6.8 months (range, 3.9-11.8 months), respectively, while the median OS time was 11.5 months (range, 8.4-28.8+ months) and not reached (range, 3.9-38.5+ months), respectively. In conclusion, mEHT therapy with weekly paclitaxel or cisplatin appeared safe and warrants further investigation. The present trial was registered with www.clinicaltrials.gov on January 22, 2015 (trial registration no. NCT02344095)., Competing Interests: The authors declare that they have no competing interests., (Copyright: © Kim et al.)- Published
- 2021
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42. Incorporating patient centered benefits as endpoints in randomized trials of maintenance therapies in advanced ovarian cancer: A position paper from the GCIG symptom benefit committee.
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Kurtz JE, Gebski V, Sukhin V, Carey M, Kong I, Glasspool RM, Berek JS, de Paiva Batista M, Hall M, Kim JW, Yeoshoua E, Fujiwara N, Nam BH, Polleis S, Lee JY, Strojna A, Farrelly L, Schwameis R, Fossati R, Darlington AS, Lai CH, Wright AA, Rosenblat O, Harter P, Roxburgh P, Chowdhury RR, Chang TC, Paoletti X, and Friedlander M
- Subjects
- Female, Humans, Maintenance Chemotherapy, Ovarian Neoplasms diagnosis, Ovarian Neoplasms drug therapy, Patient Reported Outcome Measures, Quality of Life, Ovarian Neoplasms therapy, Patient-Centered Care methods, Randomized Controlled Trials as Topic methods
- Abstract
Background: Quality of life and patient reported outcome measures (PROMs) are important secondary endpoints and incorporated in most contemporary clinical trials. There have been deficiencies in their assessment and reporting in ovarian cancer clinical trials, particularly in trials of maintenance treatment where they are of particular importance. The Gynecologic Cancer InterGroup (GCIG) symptom benefit committee (SBC) recently convened a brainstorming meeting with representation from all collaborative groups to address questions of how to best incorporate PROMs into trials of maintenance therapies to support the primary endpoint which is usually progression free survival (PFS). These recommendations should harmonize the collection, analysis and reporting of PROM's across future GCIG trials., Methods: Through literature review, trials analysis and input from international experts, the SBC identified four relevant topics to address with respect to promoting the role of PROMs to support the PFS endpoint in clinical trials of maintenance treatment for OC., Results: The GCIG SBC unanimously accepted the importance of integrating PROM's in future maintenance trials and developed four guiding principles to be considered early in trial design. These include 1) adherence to SPIRIT-PRO guidelines, 2) harmonization of selection, collection and reporting of PROM's; 3) combining Health Related Quality of Life (HRQL) measures with clinical endpoints and 4) common approaches to dealing with incomplete HRQL data., Conclusions: Close attention to incorporating HRQL and PROM's is critical to interpret the results of ovarian cancer clinical trials of maintenance therapies. There should be a consistent approach to assessing and reporting patient centered benefits across all GCIG trials to enable cross trial comparisons which can be used to inform practice., (Copyright © 2021 Elsevier Inc. All rights reserved.)
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- 2021
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43. Genotyping-by-Sequencing of the regional Pacific abalone (Haliotis discus) genomes reveals population structures and patterns of gene flow.
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Nam BH, Kim H, Seol D, Kim H, Noh ES, Kim EM, Noh JK, Kim YO, Park JY, and Kwak W
- Subjects
- Animals, Republic of Korea, Gastropoda genetics, Gene Flow, Genome, Genotyping Techniques, Polymorphism, Single Nucleotide, Whole Genome Sequencing
- Abstract
Continuous monitoring of the present genetic status is essential to preserve the genetic resource of wild populations. In this study, we sequenced regional Pacific abalone Haliotis discus samples from three different locations around the Korean peninsula to assess population structure, utilizing Genotyping-by-Sequencing (GBS) method. Using PstI enzyme for genome reduction, we demonstrated the resultant library represented the whole genome region with even spacing, and as a result 16,603 single nucleotide variants (SNVs) were produced. Genetic diversity and population structure were investigated using several methods, and a strong genetic heterogeneity was observed in the Korean abalone populations. Additionally, by comparison of the variant sets among population groups, we were able to discover 26 Korean abalone population-specific SNVs, potentially associated with phenotype differences. This is the first study demonstrating the feasibility of GBS for population genetic study on H. discus. Our results will provide valuable data for the genetic conservation and management of wild abalone populations in Korea and help future GBS studies on the marine mollusks., Competing Interests: WK is affiliated with eGnome, a commercial company. This does not alter our adherence to PLOS ONE policies on sharing data and materials. There are no patents, products in development or marketed products associated with this research to declare.
- Published
- 2021
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44. Transcriptome profiling of olive flounder responses under acute and chronic heat stress.
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Kim WJ, Lee K, Lee D, Kim HC, Nam BH, Jung H, Yi SJ, and Kim K
- Subjects
- Acclimatization, Animals, Fish Proteins genetics, Fish Proteins metabolism, Flounder metabolism, Gills metabolism, Liver metabolism, Muscle, Skeletal metabolism, Flounder genetics, Heat-Shock Response, Transcriptome
- Abstract
Background: The olive flounder (Paralichthys olivaceus) is a saltwater fish, which is valuable to the economy. The olive flounder strives to adapt to environmental stressors through physiological, biochemical, and transcriptional responses. The rise in water temperature threatens the growth, development, reproduction, and survival of olive flounder. Each organ in the olive flounder can differentially respond to heat stress., Objectives: The purpose of this study is to investigate organ-specific transcriptional changes in olive flounder tissues during heat stress., Methods: In this study, transcriptome dynamics of the gill, liver, and muscle of olive flounder to acute or chronic heat stress were investigated., Results: Principal component analysis plotting revealed that the transcriptome of each organ is quite separated. K-means clustering, gene ontology, and Kyoto Encyclopedia of Genes and Genomes pathway analysis showed the differential transcriptome responses of each organ to heat stress. Heat stress commonly affects the pathways involved in the correct protein folding, DNA repair, and cell cycle., Conclusion: Our results may provide a valuable molecular basis of heat acclimation in fishes.
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- 2021
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45. Molecular Characterization of Paralichthys olivaceus MAF1 and Its Potential Role as an Anti-Viral Hemorrhagic Septicaemia Virus Factor in Hirame Natural Embryo Cells.
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Kim J, Cho JY, Kim JW, Kim DG, Nam BH, Kim BS, Kim WJ, Kim YO, Cheong J, and Kong HJ
- Subjects
- Animals, CRISPR-Cas Systems, Cell Line, Fish Diseases immunology, Fish Proteins immunology, Flounder immunology, Flounder physiology, Hemorrhagic Septicemia genetics, Hemorrhagic Septicemia immunology, Host-Pathogen Interactions, Novirhabdovirus immunology, Phylogeny, Repressor Proteins immunology, Transcription, Genetic, Fish Diseases genetics, Fish Proteins genetics, Flounder genetics, Hemorrhagic Septicemia veterinary, Novirhabdovirus physiology, Repressor Proteins genetics
- Abstract
MAF1 is a global suppressor of RNA polymerase III-dependent transcription, and is conserved from yeast to human. Growing evidence supports the involvement of MAF1 in the immune response of mammals, but its biological functions in fish are unknown. We isolated and characterized Maf1 from the olive flounder Paralichthys olivaceus ( PoMaf1 ). The coding region of PoMaf1 comprised 738 bp encoding a 245-amino-acid protein. The deduced PoMAF1 amino acid sequence shared features with those of MAF1 orthologues from vertebrates. PoMaf1 mRNA was detected in all tissues examined, and the levels were highest in eye and muscle tissue. The PoMaf1 mRNA level increased during early development. In addition, the PoMaf1 transcript level decreased during viral hemorrhagic septicemia virus (VHSV) infection of flounder hirame natural embryo (HINAE) cells. To investigate the role of PoMaf1 in VHSV infection, single-cell-derived PoMaf1 knockout HINAE cells were generated using the clustered regularly interspaced short palindromic repeats/CRISPR-associated-9 (CRISPR/Cas9) system, and cell clones with complete disruption of PoMaf1 were selected. PoMaf1 disruption increased the VHSV glycoprotein (G) mRNA levels during VHSV infection of HINAE cells, implicating PoMAF1 in the immune response to VSHV infection. To our knowledge, this is the first study to characterize fish Maf1 , which may play a role in the response to viral infection.
- Published
- 2021
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46. Multicenter phase III trial of S-1 and cisplatin versus S-1 and oxaliplatin combination chemotherapy for first-line treatment of advanced gastric cancer (SOPP trial).
- Author
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Lee KW, Chung IJ, Ryu MH, Park YI, Nam BH, Oh HS, Lee KH, Han HS, Seo BG, Jo JC, Lee HR, Kim JW, Park SR, Cho SH, and Kang YK
- Subjects
- Adult, Aged, Aged, 80 and over, Drug Combinations, Female, Humans, Male, Middle Aged, Treatment Outcome, Antineoplastic Combined Chemotherapy Protocols administration & dosage, Cisplatin administration & dosage, Oxaliplatin administration & dosage, Oxonic Acid administration & dosage, Stomach Neoplasms drug therapy, Tegafur administration & dosage
- Abstract
Background: In East Asia, S-1 plus cisplatin (SP) is one of the standard first-line chemotherapy regimens for metastatic or recurrent gastric cancer (MRGC). Oxaliplatin is generally less toxic and more convenient to administer than cisplatin., Patients and Methods: This was a multicenter, phase III study assessing whether S-1/oxaliplatin (SOX) was non-inferior/superior to SP in terms of progression-free survival (PFS). Patients with MRGC were randomized 1:1 to receive either SOX (S-1 80 mg/m
2 /day on days 1-14; oxaliplatin 130 mg/m2 on day 1; every 3 weeks) or SP (S-1 80 mg/m2 /day on days 1-14; cisplatin 60 mg/m2 on day 1; every 3 weeks [SP3])., Results: Between October 2012 and October 2014, 338 patients were randomized. The median age was 56 years, and 51% of patients had measurable lesions. SOX was significantly non-inferior but not superior to SP3 in terms of PFS [median 5.6 versus 5.7 months; hazard ratio (HR) 0.85; 95% confidence interval (CI) 0.67-1.07]. In patients with measurable disease, objective response rates were similar between SOX and SP3 (58% versus 60%). Overall, the survival in both groups did not differ (median 12.9 versus 11.4 months; HR 0.86; 95% CI 0.66-1.11). Treatment was well tolerated in both arms. Anemia, leucopenia, neutropenia, febrile neutropenia, and oral mucositis were more common with SP3. In contrast, thrombocytopenia, nausea, vomiting, and peripheral neuropathy were more common with SOX., Conclusions: SOX was non-inferior to SP3. The two regimens were well tolerated with different toxicity profiles. The SOX regimen can be recommended as a first-line treatment for MRGC., Trial Registration: ClinicalTrials.gov: NCT01671449.- Published
- 2021
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47. Twelve quick steps for genome assembly and annotation in the classroom.
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Jung H, Ventura T, Chung JS, Kim WJ, Nam BH, Kong HJ, Kim YO, Jeon MS, and Eyun SI
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- Animals, Computational Biology, Gene Library, Genomics education, Genomics statistics & numerical data, High-Throughput Nucleotide Sequencing methods, High-Throughput Nucleotide Sequencing statistics & numerical data, Humans, Molecular Sequence Annotation statistics & numerical data, RNA-Seq methods, RNA-Seq statistics & numerical data, Sequence Analysis, DNA methods, Sequence Analysis, DNA statistics & numerical data, Genome, Genomics methods, Molecular Sequence Annotation methods
- Abstract
Eukaryotic genome sequencing and de novo assembly, once the exclusive domain of well-funded international consortia, have become increasingly affordable, thus fitting the budgets of individual research groups. Third-generation long-read DNA sequencing technologies are increasingly used, providing extensive genomic toolkits that were once reserved for a few select model organisms. Generating high-quality genome assemblies and annotations for many aquatic species still presents significant challenges due to their large genome sizes, complexity, and high chromosome numbers. Indeed, selecting the most appropriate sequencing and software platforms and annotation pipelines for a new genome project can be daunting because tools often only work in limited contexts. In genomics, generating a high-quality genome assembly/annotation has become an indispensable tool for better understanding the biology of any species. Herein, we state 12 steps to help researchers get started in genome projects by presenting guidelines that are broadly applicable (to any species), sustainable over time, and cover all aspects of genome assembly and annotation projects from start to finish. We review some commonly used approaches, including practical methods to extract high-quality DNA and choices for the best sequencing platforms and library preparations. In addition, we discuss the range of potential bioinformatics pipelines, including structural and functional annotations (e.g., transposable elements and repetitive sequences). This paper also includes information on how to build a wide community for a genome project, the importance of data management, and how to make the data and results Findable, Accessible, Interoperable, and Reusable (FAIR) by submitting them to a public repository and sharing them with the research community., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2020
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48. First-iGAP: A Randomized Placebo-Controlled Phase II Study of First-line Intercalated Gefitinib and Pemetrexed-Cisplatin Chemotherapy for Never-Smoker Lung Adenocarcinoma Patients.
- Author
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Lee Y, Kim HY, Nam BH, Lee GK, Kim HT, Han JY, An HJ, and Lee JS
- Subjects
- Adenocarcinoma of Lung pathology, Aged, Carcinoma, Non-Small-Cell Lung pathology, Cisplatin administration & dosage, Female, Follow-Up Studies, Gefitinib administration & dosage, Humans, Lung Neoplasms pathology, Male, Pemetrexed administration & dosage, Prognosis, Survival Rate, Adenocarcinoma of Lung drug therapy, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Carcinoma, Non-Small-Cell Lung drug therapy, Lung Neoplasms drug therapy, Smokers statistics & numerical data
- Abstract
Background: We aimed to evaluate whether intercalated combination of EGFR tyrosine kinase inhibitor gefitinib and chemotherapy improves survival outcomes in never-smokers with advanced lung adenocarcinoma., Patients and Methods: Never-smokers with chemo-naive stage IIIB/IV lung adenocarcinoma were randomly assigned to receive either gefitinib or placebo on days 5 to 18 of a 3-weekly cycle of pemetrexed and cisplatin. Chemotherapy was given up to 9 cycles, after which gefitinib or placebo was given daily. Patients in the placebo arm who had progression were crossed over to receive gefitinib., Results: Between June 2012 and December 2014, 76 patients with median age of 58.0 years were randomized, 39 on gefitinib and 37 on the placebo arm. EGFR mutation was positive in 34 (44.7%) patients. Baseline characteristics were well balanced between the 2 arms. The gefitinib arm had a better response rate (79.5% vs. 51.4%, P = .010) and median progression-free survival (PFS) (12.4 vs. 6.7 months, hazard ratio [HR] 0.49, P = .005) than the placebo arm; however, there was no statistically significant difference in median overall survival between the 2 arms (31.8 vs. 22.9 months, HR 0.78, P = .412). The PFS benefit of intercalated use of gefitinib over placebo was more apparent for patients with EGFR-mutant tumors (13.3 vs. 7.8 months, P = .025) than those with EGFR-wild-type tumors (8.2 vs. 6.6 months, P = .063). Overall, there was no difference in the frequency of severe adverse effect between the 2 arms., Conclusions: Intercalated combination of gefitinib with pemetrexed and cisplatin was well tolerated and improved PFS in never-smoker patients with lung adenocarcinoma., (Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2020
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49. Molecular Dynamics Simulation of Calcium-Silicate-Hydrate for Nano-Engineered Cement Composites-A Review.
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Cho BH, Chung W, and Nam BH
- Abstract
With the continuous research efforts, sophisticated predictive molecular dynamics (MD) models for C-S-H have been developed, and the application of MD simulation has been expanded from fundamental understanding of C-S-H to nano-engineered cement composites. This paper comprehensively reviewed the current state of MD simulation on calcium-silicate-hydrate (C-S-H) and its diverse applications to nano-engineered cement composites, including carbon-based nanomaterials (i.e., carbon nanotube, graphene, graphene oxide), reinforced cement, cement-polymer nanocomposites (with an application on 3D printing concrete), and chemical additives for improving environmental resistance. In conclusion, the MD method could not only compute but also visualize the nanoscale behaviors of cement hydrates and other ingredients in the cement matrix; thus, fundamental properties of C-S-H structure and its interaction with nanoparticles can be well understood. As a result, the MD enabled us to identify and evaluate the performance of new advanced nano-engineered cement composites., Competing Interests: Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.
- Published
- 2020
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50. Ovarian transcriptome profiles associated with sexual maturation in Pacific abalone (Haliotis discus hannai).
- Author
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Kim MA, Kim TH, Lee S, Nam BH, Lee JS, Jang W, and Sohn YC
- Subjects
- Animals, Female, Gastropoda growth & development, Gene Library, Gene Ontology, Ovary metabolism, Sequence Analysis, RNA, Sexual Maturation genetics, Gastropoda genetics, Ovary growth & development, RNA genetics, Transcriptome genetics
- Abstract
Background: There is now abundant information on genes involved in molluscan oogenesis and their associations with ovarian development. However, few studies have investigated the ovarian transcriptome of Pacific abalone (Haliotis discus hannai)., Objective: The objective of this study was to identify genes related to ovarian development and maturation in Pacific abalone utilizing RNA-sequencing (RNA-seq) and to verify the genes most relevant to different stages of maturation., Methods: RNA samples from the ovarian tissues of sexually immature and mature abalone were used to construct cDNA libraries, which were paired-end sequenced on an Illumina HiSeq 2500 platform. Reads from individual samples (unigenes) were aligned to reference transcriptome databases for identification of differentially expressed genes (DEGs) between immature and mature ovarian libraries. Reverse transcription-quantitative polymerase chain reaction was used to verify the RNA-seq data., Results: A total of 8779 unigenes were obtained from the ovaries of immature and mature abalone, with a total length of 3323,279 bp and an average length of 379 bp per gene. Gene ontology analysis assigned 5860 unigenes to biological processes, 855 to cellular components, and 1352 to molecular functions. Overall, 470 DEGs were identified, including 213 and 257 genes down-regulated and up-regulated in mature abalone, respectively. Among these, 13 relevant transcripts, including VTG1 and FZD7, were significantly highly expressed in the ovaries of mature abalone (p < 0.05, fold change > 2)., Conclusion: This H. discus hannai ovary transcriptome provides molecular targets to better understand ovarian development, oogenesis, and sexual maturation, and to enhance Pacific abalone production.
- Published
- 2020
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