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1,364 results on '"Choi, Joon Young"'

51. Risk factors of breast cancer recurrence in pathologic complete response achieved by patients following neoadjuvant chemotherapy: a single-center retrospective study

Author

Choi, Joon Young, primary, Woen, Doyoun, additional, Jang, Sung Yoon, additional, Lee, Hyunjun, additional, Shin, Dong Seung, additional, Kwak, Youngji, additional, Lee, Hyunwoo, additional, Chae, Byung Joo, additional, Yu, Jonghan, additional, Lee, Jeong Eon, additional, Kim, Seok Won, additional, Nam, Seok Jin, additional, and Ryu, Jai Min, additional

Published
2023
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52. Reevaluating of the feasibility of ground-based earth-mass microlensing planet detections

Author

Jung, Youn Kil, Park, Hyuk, Han, Cheongho, Hwang, Kyu-Ha, Shin, In-Gu, and Choi, Joon-Young

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

One important strength of the microlensing method in detecting extrasolar planets is its high sensitivity to low-mass planets. However, it is often believed that microlensing detections of Earth-mass planets from ground-based observation would be difficult due to the limit set by finite-source effects. This view comes from the previous estimation of the planet detection probability based on the fractional deviation of planetary signals, but proper probability estimation requires to additionally consider the source brightness, which is directly related to the photometric precision. In this paper, we reevaluate the feasibility of low-mass planet detections considering photometric precision for different populations of source stars. From this, it is found that contribution of the improved photometric precision to the planetary signal of a giant-source event is big enough to compensate the decrease of the magnification excess caused by finite-source effects. As a result, we find that giant-source events are suitable targets for Earth-mass planet detections with significantly higher detection probability than events involved with source stars of smaller radii and predict that Earth-mass planets would be detected by prospective high-cadence surveys., Comment: 4 pages, 3 figures, ApJ accepted

Published
2014
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60. Response

Author

Choi, Joon Young, Kim, Ki Uk, Kim, Deog Kyeom, Kim, Yu-Il, Kim, Tae-Hyung, Lee, Won-Yeon, Park, Seong Ju, Park, Yong Bum, Song, Jin Woo, Shin, Kyeong-Cheol, Um, Soo-Jung, Yoo, Kwang Ha, Yoon, Hyoung Kyu, Lee, Chang Youl, Lee, Ho Sung, Leem, Ah Young, Choi, Won-Il, Lim, Seong Yong, Rhee, Chin Kook, Choi, Joon Young, Kim, Ki Uk, Kim, Deog Kyeom, Kim, Yu-Il, Kim, Tae-Hyung, Lee, Won-Yeon, Park, Seong Ju, Park, Yong Bum, Song, Jin Woo, Shin, Kyeong-Cheol, Um, Soo-Jung, Yoo, Kwang Ha, Yoon, Hyoung Kyu, Lee, Chang Youl, Lee, Ho Sung, Leem, Ah Young, Choi, Won-Il, Lim, Seong Yong, and Rhee, Chin Kook

Published
2024
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61. Prognostic Value of Radiomic Analysis Using Pre- and Post-Treatment 18 F-FDG-PET/CT in Patients with Laryngeal Cancer and Hypopharyngeal Cancer.

Author

Choi, Joon Ho, Choi, Joon Young, Woo, Sang-Keun, Moon, Ji Eun, Lim, Chae Hong, Park, Soo Bin, Seo, Seongho, Ahn, Yong Chan, Ahn, Myung-Ju, Moon, Seung Hwan, and Park, Jung Mi

Subjects
*HYPOPHARYNGEAL cancer, *LARYNGEAL cancer, *PROGNOSIS, *CANCER patients, *COMPUTED tomography, *REGRESSION analysis
Abstract

Background: The prognostic value of conducting 18F-FDG PET/CT imaging has yielded different results in patients with laryngeal cancer and hypopharyngeal cancer, but these results are controversial, and there is a lack of dedicated studies on each type of cancer. This study aimed to evaluate whether combining radiomic analysis of pre- and post-treatment 18F-FDG PET/CT imaging features and clinical parameters has additional prognostic value in patients with laryngeal cancer and hypopharyngeal cancer. Methods: From 2008 to 2016, data on patients diagnosed with cancer of the larynx and hypopharynx were retrospectively collected. The patients underwent pre- and post-treatment 18F-FDG PET/CT imaging. The values of ΔPre-Post PET were measured from the texture features. Least absolute shrinkage and selection operator (LASSO) Cox regression was used to select the most predictive features to formulate a Rad-score for both progression-free survival (PFS) and overall survival (OS). Kaplan–Meier curve analysis and Cox regression were employed to assess PFS and OS. Then, the concordance index (C-index) and calibration plot were used to evaluate the performance of the radiomics nomogram. Results: Study data were collected for a total of 91 patients. The mean follow-up period was 71.5 mo. (8.4–147.3). The Rad-score was formulated based on the texture parameters and was significantly associated with both PFS (p = 0.024) and OS (p = 0.009). When predicting PFS, only the Rad-score demonstrated a significant association (HR 2.1509, 95% CI [1.100–4.207], p = 0.025). On the other hand, age (HR 1.116, 95% CI [1.041–1.197], p = 0.002) and Rad-score (HR 33.885, 95% CI [2.891–397.175], p = 0.005) exhibited associations with OS. The Rad-score value showed good discrimination when it was combined with clinical parameters in both PFS (C-index 0.802–0.889) and OS (C-index 0.860–0.958). The calibration plots also showed a good agreement between the observed and predicted survival probabilities. Conclusions: Combining clinical parameters with radiomics analysis of pre- and post-treatment 18F-FDG PET/CT parameters in patients with laryngeal cancer and hypopharyngeal cancer might have additional prognostic value. [ABSTRACT FROM AUTHOR]

Published
2024
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75. A risk stratification model for nodal peripheral T-cell lymphomas based on the NCCN-IPI and posttreatment Deauville score

Author

Yhim, Ho-Young, Park, Yong, Han, Yeon-Hee, Kim, Sungeun, Kang, Sae-Ryung, Moon, Joon-Ho, Jeong, Ju Hye, Shin, Ho-Jin, Kim, Keunyoung, Choi, Yoon Seok, Kim, Kunho, Kim, Min Kyoung, Kong, Eunjung, Kim, Dae Sik, Eo, Jae Seon, Lee, Ji Hyun, Kang, Do-Young, Lee, Won Sik, Lee, Seok Mo, Do, Young Rok, Ham, Jun Soo, Kim, Seok Jin, Kim, Won Seog, Choi, Joon Young, Yang, Deok-Hwan, and Kwak, Jae-Yong

Published
2018
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82. Progesterone Receptor Expression Level Predicts Prognosis of Estrogen Receptor-Positive/HER2-Negative Young Breast Cancer: A Single-Center Prospective Cohort Study

Author

Kwak, Youngji, primary, Jang, Sung Yoon, additional, Choi, Joon Young, additional, Lee, Hyunjun, additional, Shin, Dong Seung, additional, Park, Yeon Hee, additional, Kim, Ji-Yeon, additional, Ahn, Jin-Seok, additional, Chae, Byung Joo, additional, Yu, Jonghan, additional, Lee, Jeong Eon, additional, Kim, Seok Won, additional, Nam, Seok Jin, additional, and Ryu, Jai Min, additional

Published
2023
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94. Associations between depression and anxiety index and frequency of acute exacerbation in chronic obstructive pulmonary disease.

Author

Hong, Yu Jin, Kim, Youlim, Moon, Ji-Yong, Park, Shinhee, Lee, Jung-Kyu, Jung, Ki-Suck, Yoo, Kwang Ha, Kim, Yu-Il, and Choi, Joon Young

Subjects
CHRONIC obstructive pulmonary disease, DISEASE exacerbation, TEST anxiety, BECK Anxiety Inventory, ANXIETY, FORCED expiratory volume
Abstract

Background: Comorbidities of chronic obstructive pulmonary disease (COPD) influence clinical characteristics and prognosis. Objectives: This study compared the clinical characteristics and exacerbation rate of COPD according to the presence of depression or anxiety. Design: This study used data from The Korea COPD Subgroup Study (KOCOSS) cohort, a nationwide prospective cohort from 54 medical centers, between April 2012 and 2019. Methods: Depression and anxiety were diagnosed with the Beck Depression Inventory and Beck Anxiety Inventory. Negative binomial regression analysis was performed to analyze the frequency of exacerbations in depressed patients and anxiety. Differences in lung function trajectory according to presence of depression/anxiety were analyzed using a linear mixed model. Results: In all, 2147 patients were enrolled. Depressed patients or anxiety had lower lung function, higher modified Medical Research Council (mMRC) grade, St. George Respiratory Questionnaire (SGRQ) score, and COPD assessment test score, and higher rates of exacerbation in the past year than those without depression/anxiety. Depressed patients had a higher frequency of moderate to severe exacerbations [Incidence Rate Ratio (IRR): 1.57, CI: 1.17–2.11, p = 0.002] and those with anxiety had higher frequencies of moderate to severe (IRR: 1.52, CI: 1.03–2.27, p = 0.038) and severe exacerbations (IRR: 2.13, CI: 1.09–4.15, p = 0.025) during 1-year follow-up compared to those without these comorbidities. The differences in the change in annual forced expiratory volume in 1 seconds (FEV1) over 3 years according to the presence of depression or anxiety were not statistically significant. Conclusion: Depressed and anxious patients showed increased respiratory symptoms and exacerbation rate as well as reduced health-related quality of life, whereas there were no significant differences in changes in lung function between groups with and without depression/anxiety. [ABSTRACT FROM AUTHOR]

Published
2023
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