228 results on '"Ng CC"'
Search Results
2. Transcriptomic convergence despite genomic divergence drive field cancerization in synchronous squamous tumors
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Rajasegaran, Lim Tk, Ong Ck, Liu Y, Teh Bt, Nicholas B. Shannon, Kon Ol, Ng G, Tan Sjj, Weng Khong Lim, Ng Wh, Ong Cj, Ng Cc, Lek Sm, Soo Kc, Chia Cs, Koh Kk, Josephine Hendrikson, Iyer Ng, Yap Dr, Tan Qx, and Tan Jw
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Evolutionary biology ,Field cancerization ,Convergence (relationship) ,Biology ,Divergence (statistics) - Abstract
Field cancerization is suggested to arise from imbalanced differentiation in individual basal progenitor cells leading to clonal expansion of mutant cells that eventually replace the epithelium, although without evidence. Through deep sequencing analyses, we characterized the genomic and transcriptomic landscapes of field change in two patients with synchronous aerodigestive tract tumors. Our data support the emergence of numerous genetic alterations in cancer-associated genes but refutes the hypothesis that founder mutation(s) underpin this phenomenon. Instead, our analyses suggest a common etiologic factor defined by mutational signatures and/or transcriptomic convergence, which could provide a therapeutic opportunity.
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- 2021
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3. Past and present infestation of the stalked ciliate Zoothamnium sp. on copepods in the Klang Strait
- Author
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Goh, HC, primary, Chew, LL, additional, Bong, CW, additional, Ng, CC, additional, and Chong, VC, additional
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- 2019
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4. Hybrid Ageing Patterns for Face Age Estimation
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Ng, CC, Yap, Moi, Cheng, YT, Hsu, GS, Ng, CC, Yap, Moi, Cheng, YT, and Hsu, GS
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Wrinkles can be embedded in several image-based applications as a descriptor for human skin. However, wrinkle-based age estimation research has not been widely addressed. In this paper, we introduce a Multi-scale Wrinkle Patterns (MWP) representation, investigate the effect of wrinkles on face age estimation and propose Hybrid Ageing Patterns (HAP) for face age estimation. To define the wrinkle regions more precisely, a template consisting of 10 regions constructed relatively to a set of automatically located facial landmarks is used. We extract the multi-scale wrinkles in each region and encode them into MWP. We use Support Vector Regression to estimate age from the combination of such patterns. The performance of the algorithms is assessed by using Mean Absolute Error (MAE) on three state-of-the-art datasets - FG-NET, FERET and MORPH. We observe that MWP produces a comparable MAE of 4.16 on FERET to the state of the art. Finally we propose HAP, which combines the features from MWP and the Facial Appearance Model (FAM), and demonstrate improved performance on FERET and MORPH with MAE of 3.02 (±2.92) and 3.68 (±2.98), respectively. Therefore, we conclude that MWP is an important complementary feature for face age estimation.
- Published
- 2018
5. Hybrid Ageing Patterns for Face Age Estimation
- Author
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Ng, CC, Yap, Moi, Cheng, YT, Hsu, GS, Ng, CC, Yap, Moi, Cheng, YT, and Hsu, GS
- Abstract
Wrinkles can be embedded in several image-based applications as a descriptor for human skin. However, wrinkle-based age estimation research has not been widely addressed. In this paper, we introduce a Multi-scale Wrinkle Patterns (MWP) representation, investigate the effect of wrinkles on face age estimation and propose Hybrid Ageing Patterns (HAP) for face age estimation. To define the wrinkle regions more precisely, a template consisting of 10 regions constructed relatively to a set of automatically located facial landmarks is used. We extract the multi-scale wrinkles in each region and encode them into MWP. We use Support Vector Regression to estimate age from the combination of such patterns. The performance of the algorithms is assessed by using Mean Absolute Error (MAE) on three state-of-the-art datasets - FG-NET, FERET and MORPH. We observe that MWP produces a comparable MAE of 4.16 on FERET to the state of the art. Finally we propose HAP, which combines the features from MWP and the Facial Appearance Model (FAM), and demonstrate improved performance on FERET and MORPH with MAE of 3.02 (±2.92) and 3.68 (±2.98), respectively. Therefore, we conclude that MWP is an important complementary feature for face age estimation.
- Published
- 2017
6. Computer vision algorithms in the detection of diabetic foot ulceration: a new paradigm for diabetic foot care?
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Yap, MH, Ng, CC, Chatwin, K, Abbott, CA, Bowling, FL, Boulton, AJM, Reeves, ND, Yap, MH, Ng, CC, Chatwin, K, Abbott, CA, Bowling, FL, Boulton, AJM, and Reeves, ND
- Published
- 2016
7. Cross-reactivity in AED-Induced Severe Cutaneous Adverse Reaction: A Case Report
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Khor, AHP, primary, Lim, KS, additional, Tan, CT, additional, Kwan, Z, additional, and Ng, CC, additional
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- 2016
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8. Computer Vision Algorithms in the Detection of Diabetic Foot Ulceration: A New Paradigm for Diabetic Foot Care?
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Yap, MH, Ng, CC, Chatwin, K, Abbott, CA, Bowling, FL, Boulton, AJ, Reeves, ND, Yap, MH, Ng, CC, Chatwin, K, Abbott, CA, Bowling, FL, Boulton, AJ, and Reeves, ND
- Published
- 2015
9. Functional antioxidant and tyrosinase inhibitory properties of extracts of Taiwanese pummelo (Citrus grandis Osbeck)
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Wu, SJ, Ng, CC, Tzeng, WS, Ho, KC, and Shyu, YT
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Antioxidant, free radical chelating, limonin, pummelo, tyrosinase - Abstract
In recent years, the overproduction of citrus fruits has resulted in an unnecessary increase in agricultural wastes in Taiwan. In an attempt to find an application for these potentially valuable wastes, we evaluated the antioxidant and whitening properties of six Taiwanese pummelo varieties (Miyu Shihtouyu Taipeiyu Touyu Wentan and Hsishihyu). The methanolic extract of Citrus grandis Osbeck Miyu (Miyu) had the highest phenolic content (9.99 mg of gallic acid equivalent/g). C. grandis Osbeck Shihtouyu (Shihtouyu) displayed the highest 2, 2-azino-bis-(3- ethylbenzthiazoline-6-sulfonic acid) content (9.3 mg trolox equivalent antioxidant content/g), indicating its good free radical-scavenging activity. C. grandis Osbeck Taipeiyu (Taipeiyu) showed the highest 1,1-diphenyl-2-picrylhydrazyl content and this compound too possesses good radical-scavenging activity. The ferrous-ion chelating effect of C. grandis Osbeck Touyu (Touyu) and C. grandis Osbeck Wentan (Wentan) was found to be 0.78 and 0.92 mg/ml, respectively. Taipeiyu showed the highest limonin content (1251.86 μg/ml). Touyu inhibited tyrosinase up to 90.8% (10 mg/ml), which was almost similar to the 95% inhibition shown by kojic acid (10 mg/ml). Thus, the components of pummelo have high potential for use as ingredients in products that prevent skin pigmentation. These results indicate that the methanolic extracts and the phytochemicals derived from pummelo are potential natural antioxidant agents.Key words: Antioxidant, free radical chelating, limonin, pummelo, tyrosinase.
- Published
- 2013
10. Ministry of health clinical practice guidelines: dementia
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Yeo D, Kua J, Chen Lh, Sitoh Yy, Mei Sian Chong, Marziyana Ar, Yap Lk, Ng Ll, Nagaendran K, Chua Ev, Goh Ck, Yeo Y, Lee T, Seow D, Ng Cc, and Shiong Lw
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Singapore ,Executive summary ,Evidence-Based Medicine ,Primary Health Care ,business.industry ,MEDLINE ,General Medicine ,Evidence-based medicine ,medicine.disease ,Clinical Practice ,Nursing ,Geriatrics ,Practice Guidelines as Topic ,medicine ,Dementia ,Humans ,Christian ministry ,Medical journal ,Public Health ,business ,Multiple choice - Abstract
The Ministry of Health (MOH) has updated the clinical practice guidelines on Dementia to provide doctors and patients in Singapore with evidence-based treatment for dementia. This article reproduces the introduction and executive summary (with recommendations from the guidelines) from the MOH clinical practice guidelines on Dementia, for the information of readers of the Singapore Medical Journal. Chapters and page numbers mentioned in the reproduced extract refer to the full text of the guidelines, which are available from the Ministry of Health website: http://www.moh.gov.sg/content/moh_web/healthprofessionalsportal/doctors/guidelines/cpg_medical/2013/cpgmed_dementia_revised.html. The recommendations should be used with reference to the full text of the guidelines. Following this article are multiple choice questions based on the full text of the guidelines.
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- 2013
11. An investigation on local wrinkle-based extractor of age estimation
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Ng, CC, Yap, MH, Costen, N, Li, B, Ng, CC, Yap, MH, Costen, N, and Li, B
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Research related to age estimation using face images has become increasingly important due to its potential use in various applications such as age group estimation in advertising and age estimation in access control. In contrast to other facial variations, age variation has several unique characteristics which make it a challenging task. As we age, the most pronounced facial changes are the appearance of wrinkles (skin creases), which is the focus of ageing research in cosmetic and nutrition studies. This paper investigates an algorithm for wrinkle detection and the use of wrinkle data as an age predictor. A novel method in detecting and classifying facial age groups based on a local wrinkle-based extractor (LOWEX) is introduced. First, each face image is divided into several convex regions representing wrinkle distribution areas. Secondly, these areas are analysed using a Canny filter and then concatenated into an enhanced feature vector. Finally, the face is classified into an age group using a supervised learning algorithm. The experimental results show that the accuracy of the proposed method is 80% when using FG-NET dataset. This investigation shows that local wrinkle-based features have great potential in age estimation. We conclude that wrinkles can produce a prominent ageing descriptor and identify some future research challenges. Copyright © 2014 SCITEPRESS - Science and Technology Publications. All rights reserved.
- Published
- 2014
12. Correlation of BRAF and NRAS mutation status with outcome, site of distant metastasis and response to chemotherapy in metastatic melanoma
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Carlino, MS, Haydu, LE, Kakavand, H, Menzies, AM, Hamilton, AL, Yu, B, Ng, CC, Cooper, WA, Thompson, JF, Kefford, RF, O'Toole, SA, Scolyer, RA, Long, GV, Carlino, MS, Haydu, LE, Kakavand, H, Menzies, AM, Hamilton, AL, Yu, B, Ng, CC, Cooper, WA, Thompson, JF, Kefford, RF, O'Toole, SA, Scolyer, RA, and Long, GV
- Abstract
BACKGROUND: The prognostic significance of BRAF and NRAS mutations in metastatic melanoma patients remains uncertain, with several studies reporting conflicting results, often biased by the inclusion of patients treated with BRAF and MEK (MAPK) inhibitors. We therefore interrogated a historical cohort of patients free of the confounding influence of MAPK inhibitor therapy. METHODS: Patients with available archival tissue first diagnosed with metastatic melanoma between 2002 and 2006 were analysed. Mutational analysis was performed using the OncoCarta Panel. Patient characteristics, treatment outcome and survival were correlated with BRAF/NRAS mutation status. RESULTS: In 193 patients, 92 (48%) melanomas were BRAF-mutant, 39 (20%) were NRAS-mutant and 62 (32%) were wild-type for BRAF/NRAS mutations (wt). There was no difference in response to chemotherapy based on mutation status (35-37%). The distant disease-free interval (DDFI) was significantly shorter in patients with wt melanoma (27.9 months vs 35.1 for BRAF and 49.1 for NRAS) although this was not significant in multivariate analysis. Survival from stage IV melanoma diagnosis was not significantly different based on mutation status. The DDFI was significantly shorter in patients with BRAF(V600K/R) versus BRAF(V600E) melanoma in univariate and multivariate analyses. CONCLUSIONS: BRAF and NRAS mutation status does not influence survival in metastatic melanoma.
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- 2014
13. Strain Gauging Geotextiles Using External Gauge Attachment Method
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Chew, SH, primary, Wong, WK, additional, Ng, CC, additional, Tan, SA, additional, and Karunaratne, GP, additional
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14. Abstract P2-08-03: Patterns of somatic mutations in metaplastic carcinoma of the breast
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O'Toole, SA, primary, Yu, B, additional, Ng, CC, additional, Selinger, CI, additional, Cooper, WA, additional, Carmalt, H, additional, Mak, C, additional, Chan, C, additional, Lee, S, additional, Karim, R, additional, Beith, J, additional, and Cooper, C, additional
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- 2013
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15. Ministry of Health Clinical Practice Guidelines: Dementia
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Nagaendran, K, primary, Chen, LH Christopher, additional, Chong, MS, additional, Chua, Esther Vanessa, additional, Goh, CK Shirley, additional, Kua, Joshua, additional, Lee, Theresa, additional, Marziyana, AR, additional, Ng, CC David, additional, Ng, LL, additional, Seow, Dennis, additional, Sitoh, YY, additional, Yap, LK Philip, additional, Yeo, Donald, additional, and Yeo, Y, additional
- Published
- 2013
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16. Lactic fermentation and antioxidant activity of Zingiberaceae plants in Taiwan.
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Chen IN, Ng CC, Wang CY, Chang TL, Chen, I-Nan, Ng, Chang-Chai, Wang, Chung-Yi, and Chang, Tsu-Liang
- Abstract
The present study evaluated functional properties of lactic-fermented ginger products. Three Zingiberaceae species were used as the substrate for fermentation using three lactic acid bacteria. The fermentation process ended 35-40 h after inoculation and reached a pH value of 3.5-4.0. Total antioxidant performances were 68-75%, and were best observed using Bifidobacterium longum as the starter in three ginger samples. DPPH scavenging was on average 70%, with free radical anion scavenging and peroxide removal effects of 30.6% and 43.7%, respectively. The product acceptance survey showed that the 100% fermented juice without a mixture with non-fermented ginger juice obtained the highest score in overall performance. The lactic-fermented Vanoverberghia and Hedychium ginger species retained an antioxidant activity and DPPH scavenging activity of on average 70%. This study may suggest a new way of ginger food processing with high functionality. Also, it may help to popularize the growing and processing of endemic ginger plants in Taiwan. [ABSTRACT FROM AUTHOR]
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- 2009
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17. Retrospective study of the success rates and complications associated with total laparoscopic hysterectomy.
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Ng CC, Chern BS, and Siow AY
- Published
- 2007
18. Ergometrine administration for post-partum haemorrhage in an undiagnosed pre-eclamptic.
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Ng SY, Ithnin F, Sia AT, Ng CC, Ng, S Y, Ithnin, F, Sia, A T H, and Ng, C C M
- Abstract
We report a case of a parturient who was well antenatally but presented with oliguria following delivery. The possibility of post-partum pre-eclampsia was obscured by simultaneous post-partum haemorrhage. Ergometrine was given and she suffered an eclamptic seizure shortly after. We discuss the diagnostic difficulties presented by simultaneous presentation of post-partum pre-eclampsia and haemorrhage and the likelihood that ergometrine precipitated eclampsia in a patient at risk. While ergometrine is an effective drug for the management of uterine atony, its potential role in precipitating eclampsia must be considered. [ABSTRACT FROM AUTHOR]
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- 2008
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19. Aristolochic acid-related renal cell carcinoma exhibits a distinct tumor-immune microenvironment favoring response to immune checkpoint blockade.
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Lin PH, Chan JY, Guan P, Hong JH, Lim AH, Ng CC, Yeong JPS, Lee JY, Liu W, Lim JCT, Pang ST, and Teh BT
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- Humans, Female, Male, Middle Aged, Aged, Biomarkers, Tumor genetics, Biomarkers, Tumor metabolism, Exome Sequencing, Carcinoma, Renal Cell genetics, Carcinoma, Renal Cell drug therapy, Carcinoma, Renal Cell pathology, Carcinoma, Renal Cell immunology, Tumor Microenvironment immunology, Aristolochic Acids, Kidney Neoplasms genetics, Kidney Neoplasms pathology, Kidney Neoplasms immunology, Kidney Neoplasms drug therapy, Immune Checkpoint Inhibitors therapeutic use, Immune Checkpoint Inhibitors adverse effects, Mutation
- Abstract
Immune checkpoint blockade (ICB) is currently the standard of care for metastatic renal cell carcinoma (RCC), but treatment responses remain unpredictable. Aristolochic acid (AA), a prevalent supplement additive in Taiwan, has been associated with RCC and induces signature mutations, although its effect on the tumor-immune microenvironment (TIME) is unclear. We aimed to investigate the immune profile of AA-positive RCCs and explore its potential role as a susceptible candidate for ICB. Tissue samples from 22 patients with clear cell RCC (ccRCC) were collected for whole-exome sequencing to determine the genetic features and AA mutational signature (the discovery cohort). The corresponding RNA was sent for NanoString PanCancer IO 360 gene expression analysis to explore the immunological features. The formalin-fixed, parafilm-embedded slides of ccRCCs were sent for multiplex immunohistochemistry/immunofluorescence stain using Vectra system to evaluate the TIME. Tissues from two patients with metastatic RCC demonstrating complete response to ICB were sent for studies to validate the findings (the index patients). The results showed that AA mutational signatures with high tumor mutational burden (TMB) were present in 31.81% of the tumors in the discovery cohort. Three distinct clusters were observed through NanoString analysis. Clusters 1 and 3 were composed mainly of AA-positive RCCs. Cluster 3 RCCs exhibited higher tumor inflammation signature scores and higher immune cell type scores. Vectra analysis revealed a higher percentage of CD15+ and BATF3+ cells in cluster 1, whereas the percentage of CD8+ cells was potentially higher in cluster 3. Strong AA mutational signatures were found in the tumors of two index patients, and both were grouped to cluster 3. In conclusion, AA may induce higher TMB and alter the immune microenvironment in RCCs, which makes the tumors more susceptible to ICB. © 2024 The Author(s). The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland., (© 2024 The Author(s). The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland.)
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- 2024
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20. Advancements in microbial-mediated radioactive waste bioremediation: A review.
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Tan JP, Clyde CW, Ng CC, Yeap SK, and Yong CY
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The global production of radioactive wastes is expected to increase in the coming years as more countries have resorted to adopting nuclear power to decrease their reliance on fossil-fuel-generated energy. Discoveries of remediation methods that can remove radionuclides from radioactive wastes, including those discharged to the environment, are therefore vital to reduce risks-upon-exposure radionuclides posed to humans and wildlife. Among various remediation approaches available, microbe-mediated radionuclide remediation have limited reviews regarding their advances. This review provides an overview of the sources and existing classification of radioactive wastes, followed by a brief introduction to existing radionuclide remediation (physical, chemical, and electrochemical) approaches. Microbe-mediated radionuclide remediation (bacterial, myco-, and phycoremediation) is then extensively discussed. Bacterial remediation involves biological processes like bioreduction, biosorption, and bioprecipitation. Bioreduction involves the reduction of water-soluble, mobile radionuclides to water-insoluble, immobile lower oxidation states by ferric iron-reducing, sulfate-reducing, and certain extremophilic bacteria, and in situ remediation has become possible by adding electron donors to contaminated waters to enrich indigenous iron- and sulfate-reducing bacteria populations. In biosorption, radionuclides are associated with functional groups on the microbial cell surface, followed by getting reduced to immobilized forms or precipitated intracellularly or extracellularly. Myco- and phycoremediation often involve processes like biosorption and bioaccumulation, where the former is influenced by pH and cell concentration. A Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis on microbial remediation is also performed. It is suggested that two research directions: genetic engineering of radiation-resistant microorganisms and co-application of microbe-mediated remediation with other remediation methods could potentially result in the discovery of in situ or ex situ microbe-involving radioactive waste remediation applications with high practicability. Finally, a comparison between the strengths and weaknesses of each approach is provided., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
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- 2024
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21. A real-world prospective observational study of eptinezumab in Asian patients with migraine.
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Zhao YJ, Ong JJY, Sonu SK, Dang J, Ng CC, Herr KJ, Bose R, and Jion YI
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- Humans, Male, Female, Adult, Prospective Studies, Middle Aged, Singapore, Calcitonin Gene-Related Peptide Receptor Antagonists administration & dosage, Calcitonin Gene-Related Peptide Receptor Antagonists pharmacology, Calcitonin Gene-Related Peptide Receptor Antagonists adverse effects, Quality of Life, Treatment Outcome, Migraine Disorders drug therapy, Antibodies, Monoclonal, Humanized administration & dosage, Antibodies, Monoclonal, Humanized pharmacology, Antibodies, Monoclonal, Humanized adverse effects, Asian People ethnology
- Abstract
Objective: To evaluate the real-world effectiveness of eptinezumab for migraine prevention in Asian patients., Background: Eptinezumab is a monoclonal antibody that targets calcitonin gene-related peptide (CGRP), a potent vasodilator with an important role in migraine pathophysiology. Although there is robust clinical evidence from pivotal Phase 3 placebo-controlled trials of the efficacy of eptinezumab for migraine prevention, there are limited data on the real-world effectiveness of eptinezumab in Asian patient cohorts., Methods: This was a non-interventional, prospective, multisite cohort study of adults with migraine (International Classification of Headache Disorders, 3rd edition criteria) in Singapore who were prescribed eptinezumab (100 mg at baseline and Month 3, administered intravenously) and were followed until Month 6. The primary endpoint was change from baseline in monthly migraine days (MMDs) at Month 3 and Month 6. Secondary endpoints were ≥30% and ≥50% responder rates, and change from baseline in the Headache Impact Test-6 (HIT-6), Migraine Disability Assessment (MIDAS), Migraine-Specific Quality of Life (MSQ), patient-identified most bothersome symptom (PI-MBS), acute medication use at Month 3 and Month 6, and safety., Results: Enrolled patients (completed = 29/30) had on average 3.4 (SD 2.9) previous preventive treatments; 29/30 of the patients had trialed at least one previous preventive treatment without benefit. Most had previously trialed oral preventives (87%, 26/30) and anti-CGRP (70%, 21/30). Relative to baseline, mean MMDs decreased by 4.3 days (95% CI 2.1-6.4; p < 0.001) at Month 3 and 4.9 days (95% CI 2.1-7.7; p < 0.001) at Month 6. At Month 3 and Month 6, 14/30 (47%) and 15/29 (52%) of the patients were ≥30% responders, and 6/30 (20%) and 8/29 (28%) patients were ≥50% responders, respectively. The number of patients with severe life impairment based on the HIT-6 score (total score 60-78) decreased from 24/30 (80%) at baseline to 19/30 (63%) at Month 3 and 19/29 (66%) at Month 6. The mean MIDAS score decreased by 24.6 points (95% CI 2.82-46.38; p = 0.028) at Month 6, and the mean MSQ score increased by 12.2 points (95% CI 5.18-19.20; p = 0.001) at Month 3 and 13.6 points (95% CI 4.58-22.66; p = 0.004) at Month 6. Most patients reported improvement in the PI-MBS at Month 3 (73%, 22/30) and Month 6 (55%, 16/29). Acute medication use for headache relief decreased by 3.3 days/month (95% CI 1.0-5.6; p = 0.007) at Month 3 and 4.7 days/month (95% CI 1.7-7.7; p = 0.003) at Month 6. Treatment-emergent adverse events (TEAEs) were reported in 16/30 (54%) patients, mostly mild/moderate in severity. No serious TEAEs led to treatment discontinuation., Conclusion: Quarterly eptinezumab administration was effective and well-tolerated in Asian patients with chronic migraine., (© 2024 The Authors. Headache: The Journal of Head and Face Pain published by Wiley Periodicals LLC on behalf of American Headache Society.)
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- 2024
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22. Headache and optic disc oedema revealing autoimmune GFAP-astrocytopathy.
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Ng CC, Poh MQW, Lim SA, Swaminathan SK, and Yeo T
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- Humans, Glial Fibrillary Acidic Protein immunology, Astrocytes pathology, Female, Male, Autoantibodies blood, Papilledema etiology, Headache etiology, Magnetic Resonance Imaging
- Published
- 2024
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23. Whole genome sequencing of HER2-positive metastatic extramammary Paget's disease: a case report.
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Lim BY, Guo Z, Lim JQ, Ko TK, Lee ECY, Kannan B, Lee JY, Lim AH, Li Z, Ng CC, Busmanis I, and Chan JY
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- Humans, Male, Aged, DNA Copy Number Variations genetics, Paget Disease, Extramammary genetics, Paget Disease, Extramammary metabolism, Paget Disease, Extramammary pathology, Whole Genome Sequencing, Receptor, ErbB-2 genetics, Receptor, ErbB-2 metabolism
- Abstract
Background: Extramammary Paget's disease (EMPD) is a rare cancer that occurs within the epithelium of the skin, arising predominantly in areas with high apocrine gland concentration such as the vulva, scrotum, penis and perianal regions. Here, we aim to integrate clinicopathological data with genomic analysis of aggressive, rapidly-progressing de novo metastatic EMPD responding to HER2-directed treatment in combination with other agents, to attain a more comprehensive understanding of the disease landscape., Methods: Immunohistochemical staining on the scrotal wall tumor and bone marrow metastasis demonstrated HER2 overexpression. Whole genome sequencing of the tumor and matched blood was performed., Results: Notable copy number gains (log
2 FC > 0.9) on chromosomes 7 and 8 were detected (n = 81), with 92.6% of these unique genes specifically located on chromosome 8. Prominent cancer-associated genes include ZNF703, HOOK3, DDHD2, LSM1, NSD3, ADAM9, BRF2, KAT6A and FGFR1. Interestingly, ERBB2 gene did not exhibit high copy number gain (log2 FC = 0.4) although 90% of tumor cells stained HER2-positive. Enrichment in pathways associated with transforming growth factor-beta (TGFβ) (FDR = 0.0376, Enrichment Ratio = 8.12) and fibroblast growth factor receptor (FGFR1) signaling (FDR = 0.0082, Enrichment Ratio = 2.3) was detected. Amplicon structure analysis revealed that this was a simple-linear amplification event., Conclusion: Whole genome sequencing revealed the underlying copy number variation landscape in HER2-positive metastatic EMPD. The presence of alternative signalling pathways and genetic variants suggests potential interactions with HER2 signalling, which possibly contributed to the HER2 overexpression and observed response to HER2-directed therapy combined with other agents in a comprehensive treatment regimen., (© 2024. The Author(s).)- Published
- 2024
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24. Single-cell landscape of idiopathic multicentric Castleman disease in identical twins.
- Author
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Chan JY, Loh JW, Lim JQ, Liany H, Lee ECY, Lee JY, Kannan B, Lim BY, Guo Z, Lim K, Ha JCH, Ng CC, Ko TK, Huang D, Seow DYB, Cheng CL, Chan SH, Ngeow J, Teh BT, Lim ST, and Ong CK
- Subjects
- Humans, Male, Female, Diseases in Twins genetics, Diseases in Twins pathology, Middle Aged, Gene Expression Profiling, Castleman Disease pathology, Castleman Disease genetics, Single-Cell Analysis, Twins, Monozygotic genetics, Interleukin-6 genetics, Interleukin-6 metabolism
- Abstract
Abstract: Idiopathic multicentric Castleman disease (iMCD) is a rare cytokine-driven disorder characterized by systemic inflammation, generalized lymphadenopathy, and organ dysfunction. Here, we present an unusual occurrence of iMCD in identical twins and examined the immune milieu within the affected lymphoid organs and the host circulation using multiomic high-dimensional profiling. Using spatial enhanced resolution omics sequencing (Stereo-seq) transcriptomic profiling, we performed unsupervised spatially constrained clustering to identify different anatomic structures, mapping the follicles and interfollicular regions. After a cell segmentation approach, interleukin 6 (IL-6) pathway genes significantly colocalized with endothelial cells and fibroblastic reticular cells, confirming observations using a single-cell sequencing approach (10× Chromium). Furthermore, single-cell sequencing of peripheral blood mononuclear cells revealed an "inflammatory" peripheral monocytosis enriched for the expression of S100A family genes in both twins. In summary, we provided evidence of the putative cell-of-origin of IL-6 signals in iMCD and described a distinct monocytic host immune response phenotype through a unique identical twin model., (© 2024 American Society of Hematology. Published by Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.)
- Published
- 2024
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25. Epigenetic control of multiple genes with a lentiviral vector encoding transcriptional repressors fused to compact zinc finger arrays.
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Monteferrario D, David M, Tadi SK, Zhou Y, Marchetti I, Jeanneau C, Saviane G, Dupont CF, Martelli AE, Truong LN, Eshleman JA, Ng CC, Huston MW, Davis GD, Fontenot JD, Reik A, Rosa M, and Fenard D
- Abstract
Gene silencing without gene editing holds great potential for the development of safe therapeutic applications. Here, we describe a novel strategy to concomitantly repress multiple genes using zinc finger proteins fused to Krüppel-Associated Box repression domains (ZF-Rs). This was achieved via the optimization of a lentiviral system tailored for the delivery of ZF-Rs in hematopoietic cells. We showed that an optimal design of the lentiviral backbone is crucial to multiplex up to three ZF-Rs or two ZF-Rs and a chimeric antigen receptor. ZF-R expression had no impact on the integrity and functionality of transduced cells. Furthermore, gene repression in ZF-R-expressing T cells was highly efficient in vitro and in vivo during the entire monitoring period (up to 10 weeks), and it was accompanied by epigenetic remodeling events. Finally, we described an approach to improve ZF-R specificity to illustrate the path toward the generation of ZF-Rs with a safe clinical profile. In conclusion, we successfully developed an epigenetic-based cell engineering approach for concomitant modulation of multiple gene expressions that bypass the risks associated with DNA editing., Competing Interests: All the authors are current or former Sangamo Therapeutics employees. Sangamo Therapeutics has filed a patent application covering the technology described in this paper., (© 2024 The Author(s).)
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- 2024
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26. Accumulation of potentially toxic elements in fourfinger threadfin (Eleutheronema tetradactylum) and black pomfret (Parastromateus niger) from Selangor, Malaysia.
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Tek PPY and Ng CC
- Subjects
- Animals, Adult, Humans, Cadmium analysis, Environmental Monitoring, Malaysia, Niger, Nickel analysis, Risk Assessment, Metals, Heavy analysis
- Abstract
The accumulation of potentially toxic elements (PTEs) has raised public awareness due to harmful contamination to both human and marine creatures. This study was designed to determine the concentration of copper (Cu), zinc (Zn), cadmium (Cd), and nickel (Ni) in the intestine, kidney, muscle, gill, and liver tissues of local commercial edible fish, fourfinger threadfin (Eleutheronema tetradactylum), and black pomfret (Parastromateus niger) collected from Morib (M) and Kuala Selangor (KS). Among the studied PTEs, Cu and Zn were essential elements to regulate body metabolism with certain dosages required while Cd and Ni were considered as non-essential elements that posed chronic and carcinogenic risk. The concentration of PTEs in fish tissue samples was analyzed using flame atomic absorption spectrometry (F-AAS). By comparing the concentration of PTEs in fish tissues as a bioindicator, the environmental risk of Morib was more serious than Kuala Selangor because both fish species collected from Morib resulted in a higher PTEs concentration. For an average 62 kg adult with a fish ingestion rate (FIR) of 0.16 kg/person/day in Malaysia, the estimated weekly intake (EWI) of Cd from the consumption of E. tetradactylum (M: 0.0135 mg/kg; KS: 0.0134 mg/kg) and P. niger (M: 0.0140 mg/kg; KS: 0.0132 mg/kg) had exceeded the provisional tolerable weekly intake (Cd: 0.007 mg/kg) established by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) and oral reference dose (ORD) values of Cd (0.001 mg/kg/day) as provided by the United States Environmental Protection Agency (USEPA) regional screening level, thus it posed chronic risks for daily basis consumption. Besides, the value of the carcinogenic risk of Cd (0.7
-3 to 0.8-3 ) and Ni (0.5-3 to 0.6-3 ) were in between the acceptable range (10-6 to 10-4 ) of the health index that indicates a relatively low possibility cancer occurrence to the consumers in both Morib and Kuala Selangor. This study recommended FIR to be 0.80 kg/person/day to reduce the possibility of posing chronic and carcinogenic risks while at the same time obtaining the essential nutrients from the fish., (© 2024. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)- Published
- 2024
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27. Tumor-Infiltrating Mast Cells in Angiosarcoma Correlate With Immuno-Oncology Pathways and Adverse Clinical Outcomes.
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Tai SB, Lee ECY, Lim BY, Kannan B, Lee JY, Guo Z, Ko TK, Ng CC, Teh BT, and Chan JY
- Subjects
- Humans, Mast Cells, Signal Transduction, Apoptosis, Prognosis, Hemangiosarcoma pathology, Hemangiosarcoma therapy
- Abstract
Recent studies have described several molecular subtypes and deregulation of immuno-oncologic signaling pathways in angiosarcoma. Interestingly, mast cells were enriched in subsets of angiosarcoma, although their significance remains unknown. In this study, we aim to verify this observation using immunohistochemistry (H scores) and NanoString transcriptomic profiling and explore the association between mast cells with clinical and biological features. In the study cohort (N = 60), H scores showed a significant moderate correlation with NanoString mast cell scores (r = 0.525; P < .001). Both H score and NanoString mast cell scores showed a significant positive correlation (P < .05) with head and neck location, nonepithelioid morphology, and lower tumor grade. Mast cell enrichment significantly correlated with higher NanoString regulatory T-cell scores (H score, r = 0.32; P = .01; NanoString mast cell score, r = 0.27; P = .04). NanoString mast cell scores positively correlated with signaling pathways relating to antigen presentation (r = 0.264; P = .0414) and negatively correlated with apoptosis (r = -0.366; P = .0040), DNA damage repair (r = -0.348; P = .0064), and cell proliferation (r = -0.542; P < .001). Interestingly, in the metastatic setting, patients with mast cell-enriched angiosarcoma showed poorer progression-free survival (median, 0.2 vs 0.4 years; hazard ratio = 3.05; P = .0489) along with a trend toward worse overall survival (median, 0.2 vs 0.6 years; hazard ratio, 2.86; P = .0574) compared with patients with mast cell-poor angiosarcoma. In conclusion, we demonstrated the presence of mast cells in human angiosarcoma and provided initial evidence of their potential clinical and biological significance. Future research will be required to elucidate their specific roles and mechanisms, which may uncover novel avenues for therapeutic intervention., (Copyright © 2024 United States & Canadian Academy of Pathology. Published by Elsevier Inc. All rights reserved.)
- Published
- 2024
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28. Establishment and characterization of a patient-derived solitary fibrous tumor/hemangiopericytoma cell line model.
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Lee JY, Guan P, Lim AH, Guo Z, Li Z, Kok JST, Lee ECY, Lim BY, Kannan B, Loh JW, Ng CC, Lim KS, Teh BT, Ko TK, and Chan JY
- Subjects
- Humans, Gene Fusion, Gene Expression Profiling, Cell Line, Hemangiopericytoma genetics, Hemangiopericytoma diagnosis, Hemangiopericytoma metabolism, Solitary Fibrous Tumors genetics, Solitary Fibrous Tumors diagnosis, Solitary Fibrous Tumors pathology
- Abstract
Solitary fibrous tumor/Hemangiopericytoma (SFT/HPC) is a rare subtype of soft tissue sarcoma harboring NAB2-STAT6 gene fusions. Mechanistic studies and therapeutic development on SFT/HPC are impeded by scarcity and lack of system models. In this study, we established and characterized a novel SFT/HPC patient-derived cell line (PDC), SFT-S1, and screened for potential drug candidates that could be repurposed for the treatment of SFT/HPC. Immunohistochemistry profiles of the PDC was consistent with the patient's tumor sample (CD99+/CD34+/desmin-). RNA sequencing, followed by Sanger sequencing confirmed the pathognomonic NAB2exon3-STAT6exon18 fusion in both the PDC and the original tumor. Transcriptomic data showed strong enrichment for oncogenic pathways (epithelial-mesenchymal transition, FGF, EGR1 and TGFβ signaling pathways) in the tumor. Whole genome sequencing identified potentially pathogenic somatic variants such as MAGEA10 and ABCA2. Among a panel of 14 targeted agents screened, dasatinib was identified to be the most potent small molecule inhibitor against the PDC (IC
50 , 473 nM), followed by osimertinib (IC50 , 730 nM) and sunitinib (IC50 , 1765 nM). Methylation profiling of the tumor suggests that this specific variant of SFT/HPC could lead to genome-wide hypomethylation. In conclusion, we established a novel PDC model of SFT/HPC with comprehensive characterization of its genomic, epigenomic and transcriptomic landscape, which can facilitate future preclinical studies of SFT/HPC, such as in vitro drug screening and in vivo drug testing., (© 2023. The Author(s) under exclusive licence to Japan Human Cell Society.)- Published
- 2024
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29. Multiple system atrophy-cerebellar subtype.
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Ng CC and Tan TLE
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- Humans, Cerebellum diagnostic imaging, Severity of Illness Index, Multiple System Atrophy diagnosis
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- 2023
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30. An ecological transcriptome approach to capture the molecular and physiological mechanisms of mass flowering in Shorea curtisii .
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Suhaimi AH, Kobayashi MJ, Satake A, Ng CC, Lee SL, Muhammad N, Numata S, Otani T, Kondo T, Tani N, and Yeoh SH
- Subjects
- Animals, Flowers genetics, Gene Expression Profiling, Reproduction genetics, Transcriptome genetics, Dipterocarpaceae genetics
- Abstract
Climatic factors have commonly been attributed as the trigger of general flowering, a unique community-level mass flowering phenomenon involving most dipterocarp species that forms the foundation of Southeast Asian tropical rainforests. This intriguing flowering event is often succeeded by mast fruiting, which provides a temporary yet substantial burst of food resources for animals, particularly frugivores. However, the physiological mechanism that triggers general flowering, particularly in dipterocarp species, is not well understood largely due to its irregular and unpredictable occurrences in the tall and dense forests. To shed light on this mechanism, we employed ecological transcriptomic analyses on an RNA-seq dataset of a general flowering species, Shorea curtisii (Dipterocarpaceae), sequenced from leaves and buds collected at multiple vegetative and flowering phenological stages. We assembled 64,219 unigenes from the transcriptome of which 1,730 and 3,559 were differentially expressed in the leaf and the bud, respectively. Differentially expressed unigene clusters were found to be enriched with homologs of Arabidopsis thaliana genes associated with response to biotic and abiotic stresses, nutrient level, and hormonal treatments. When combined with rainfall data, our transcriptome data reveals that the trees were responding to a brief period of drought prior to the elevated expression of key floral promoters and followed by differential expression of unigenes that indicates physiological changes associated with the transition from vegetative to reproductive stages. Our study is timely for a representative general flowering dipterocarp species that occurs in forests that are under the constant threat of deforestation and climate change as it pinpoints important climate sensitive and flowering-related homologs and offers a glimpse into the cascade of gene expression before and after the onset of floral initiation., Competing Interests: The authors declare there are no competing interests., (©2023 Suhaimi et al.)
- Published
- 2023
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31. BARTONELLA HENSELAE -ASSOCIATED OPTIC NEUROPATHY PRESENTING AS A CENTRAL SCOTOMA IN THE ABSENCE OF OVERT PAPILLITIS: A MULTIMODAL IMAGING STUDY.
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Ng CC, McDonald HR, Bern BH, Carson MD, and Cunningham ET Jr
- Subjects
- Humans, Female, Animals, Cats, Aged, Scotoma diagnosis, Scotoma etiology, Fluorescein Angiography, Multimodal Imaging, Tomography, Optical Coherence, Bartonella henselae, Papilledema, Optic Nerve Diseases complications, Optic Disk
- Abstract
Background/purpose: The purpose of this report was to describe the use of multimodal imaging to establish the diagnosis of Bartonella henselae -associated optic neuropathy in a patient who presented with a central scotoma without overt evidence of optic nerve involvement., Methods: This was a case report. Main outcome measures included clinical, optical coherence tomography, and fluorescein angiography findings., Observations: A 72-year-old woman presented with a 3-day history of central scotoma in the left eye. Her examination was remarkable for faint exudation in the nasal macula of the left eye but was otherwise normal for her age. Spectral domain optical coherence tomography of the macula revealed mild thickening of the papillomacular bundle with scattered small cystoid spaces and several intraretinal exudates, none of which were visible clinically. Fluorescein angiography revealed localized leakage of the inferotemporal optic disc. When prompted, the patient recalled being scratched multiple times by her two pet kittens. Serial testing showed rising anti- B. henselae ( B. henselae ) immunoglobulin G antibody titers to 1:1,280, confirming the suspected diagnosis of B. henselae -associated optic neuropathy., Conclusion: Bartonella -associated optic nerve involvement can occur without overt evidence of optic disc swelling. Multimodal imaging can be used to suggest the diagnosis and support appropriate serologic testing., (Copyright © 2022 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the Opthalmic Communications Society, Inc.)
- Published
- 2023
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32. Integrating real-world data in cost-effectiveness analysis of universal HLA-B*15:02 screening in Malaysia.
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Chong HY, Lim KS, Fong SL, Shabaruddin FH, Dahlui M, Mei Lai PS, Ng CC, and Chaiyakunapruk N
- Subjects
- Adult, Humans, Benzodiazepines therapeutic use, Carbamazepine therapeutic use, Cost-Benefit Analysis, HLA-B Antigens genetics, HLA-B15 Antigen genetics, Malaysia epidemiology, Cost-Effectiveness Analysis, Stevens-Johnson Syndrome epidemiology
- Abstract
Aims: Despite the availability of newer antiseizure medications, carbamazepine (CBZ) remains the gold standard. However, patients of Asian ancestry are susceptible to CBZ-related severe cutaneous adverse reactions. Universal HLA-B*15:02 screening is a promising intervention to address this. With the increasing recognition of integrating real-world evidence in economic evaluations, the cost-effectiveness of universal HLA-B*15:02 screening was assessed using available real-world data in Malaysia., Methods: A hybrid model of a decision tree and Markov model was developed to evaluate 3 strategies for treating newly diagnosed epilepsy among adults: (i) CBZ initiation without HLA-B*15:02 screening (current practice); (ii) universal HLA-B*15:02 screening prior to CBZ initiation; and (iii) alternative prescribing without HLA-B*15:02 screening. The model was populated with real-world inputs derived from the Malaysian population. From a societal perspective, base-case analysis and sensitivity analyses estimated the costs and outcomes over a lifetime. Incremental cost-effectiveness ratios were calculated., Results: In the base-cases analysis, universal HLA-B*15:02 screening yielded the lowest total costs and the highest total quality-adjusted life years (QALYs) gained. Compared with current practice, universal screening was less costly by USD100 and more effective by QALYs increase of 0.1306, while alternative prescribing resulted in 0.1383 QALYs loss at additional costs of USD332. The highest seizure remission rate (56%) was estimated for universal HLA-B*15:02 screening vs. current practice (54%) and alternative prescribing (48%)., Conclusion: Our study suggests that universal HLA-B*15:02 screening is a cost-effective intervention in Malaysia. With the demonstrated value of real-world evidence in economic evaluations, more relevant standardization efforts should be emphasized to better inform decision-making., (© 2023 British Pharmacological Society.)
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- 2023
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33. SLCO5A1 and synaptic assembly genes contribute to impulsivity in juvenile myoclonic epilepsy.
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Roshandel D, Sanders EJ, Shakeshaft A, Panjwani N, Lin F, Collingwood A, Hall A, Keenan K, Deneubourg C, Mirabella F, Topp S, Zarubova J, Thomas RH, Talvik I, Syvertsen M, Striano P, Smith AB, Selmer KK, Rubboli G, Orsini A, Ng CC, Møller RS, Lim KS, Hamandi K, Greenberg DA, Gesche J, Gardella E, Fong CY, Beier CP, Andrade DM, Jungbluth H, Richardson MP, Pastore A, Fanto M, Pal DK, and Strug LJ
- Abstract
Elevated impulsivity is a key component of attention-deficit hyperactivity disorder (ADHD), bipolar disorder and juvenile myoclonic epilepsy (JME). We performed a genome-wide association, colocalization, polygenic risk score, and pathway analysis of impulsivity in JME (n = 381). Results were followed up with functional characterisation using a drosophila model. We identified genome-wide associated SNPs at 8q13.3 (P = 7.5 × 10
-9 ) and 10p11.21 (P = 3.6 × 10-8 ). The 8q13.3 locus colocalizes with SLCO5A1 expression quantitative trait loci in cerebral cortex (P = 9.5 × 10-3 ). SLCO5A1 codes for an organic anion transporter and upregulates synapse assembly/organisation genes. Pathway analysis demonstrates 12.7-fold enrichment for presynaptic membrane assembly genes (P = 0.0005) and 14.3-fold enrichment for presynaptic organisation genes (P = 0.0005) including NLGN1 and PTPRD. RNAi knockdown of Oatp30B, the Drosophila polypeptide with the highest homology to SLCO5A1, causes over-reactive startling behaviour (P = 8.7 × 10-3 ) and increased seizure-like events (P = 6.8 × 10-7 ). Polygenic risk score for ADHD genetically correlates with impulsivity scores in JME (P = 1.60 × 10-3 ). SLCO5A1 loss-of-function represents an impulsivity and seizure mechanism. Synaptic assembly genes may inform the aetiology of impulsivity in health and disease., (© 2023. Springer Nature Limited and Centre of Excellence in Genomic Medicine Research, King Abdulaziz University.)- Published
- 2023
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34. Roles and significance of chelating agents for potentially toxic elements (PTEs) phytoremediation in soil: A review.
- Author
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Zulkernain NH, Uvarajan T, and Ng CC
- Subjects
- Chelating Agents, Metals analysis, Plants, Soil, Biodegradation, Environmental, Metals, Heavy analysis, Soil Pollutants analysis
- Abstract
Phytoremediation is a biological remediation technique known for low-cost technology and environmentally friendly approach, which employs plants to extract, stabilise, and transform various compounds, such as potentially toxic elements (PTEs), in the soil or water. Recent developments in utilising chelating agents soil remediation have led to a renewed interest in chelate-induced phytoremediation. This review article summarises the roles of various chelating agents and the mechanisms of chelate-induced phytoremediation. This paper also discusses the recent findings on the impacts of chelating agents on PTEs uptake and plant growth and development in phytoremediation. It was found that the chelating agents have increased the rate of metal absorption and translocation up to 45% from roots to the aboveground plant parts during PTEs phytoremediation. Besides, it was also explored that the plants may experience some phytotoxicity after adding chelating agents to the soil. However, due to the leaching potential of synthetic chelating agents, the use of organic chelants have been explored to be used in PTEs phytoremediation. Finally, this paper also presents comprehensive insights on the significance of using chelating agents through SWOT analysis to discuss the advantages and limitations of chelate-induced phytoremediation., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)
- Published
- 2023
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35. Lactate activates the mitochondrial electron transport chain independent of its metabolism.
- Author
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Cai X, Ng CC, Jones O, Fung TS, Ryu K, Li D, and Thompson CB
- Abstract
Lactate has long been considered a cellular waste product. However, we found that as extracellular lactate accumulates, it also enters the mitochondrial matrix and stimulates mitochondrial electron transport chain (ETC) activity. The resulting increase in mitochondrial ATP synthesis suppresses glycolysis and increases the utilization of pyruvate and/or alternative respiratory substrates. The ability of lactate to increase oxidative phosphorylation does not depend on its metabolism. Both L- and D-lactate are effective at enhancing ETC activity and suppressing glycolysis. Furthermore, the selective induction of mitochondrial oxidative phosphorylation by unmetabolized D-lactate reversibly suppressed aerobic glycolysis in both cancer cell lines and proliferating primary cells in an ATP-dependent manner and enabled cell growth on respiratory-dependent bioenergetic substrates. In primary T cells, D-lactate enhanced cell proliferation and effector function. Together, these findings demonstrate that lactate is a critical regulator of the ability of mitochondrial oxidative phosphorylation to suppress glucose fermentation.
- Published
- 2023
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36. ATFS-1 counteracts mitochondrial DNA damage by promoting repair over transcription.
- Author
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Dai CY, Ng CC, Hung GCC, Kirmes I, Hughes LA, Du Y, Brosnan CA, Ahier A, Hahn A, Haynes CM, Rackham O, Filipovska A, and Zuryn S
- Subjects
- Animals, Mitochondria genetics, Mitochondria metabolism, Caenorhabditis elegans metabolism, Cyclic AMP Response Element-Binding Protein genetics, DNA Damage, Mitochondrial Proteins genetics, Mitochondrial Proteins metabolism, DNA, Mitochondrial genetics, DNA, Mitochondrial metabolism, Caenorhabditis elegans Proteins genetics, Caenorhabditis elegans Proteins metabolism
- Abstract
The ability to balance conflicting functional demands is critical for ensuring organismal survival. The transcription and repair of the mitochondrial genome (mtDNA) requires separate enzymatic activities that can sterically compete
1 , suggesting a life-long trade-off between these two processes. Here in Caenorhabditis elegans, we find that the bZIP transcription factor ATFS-1/Atf5 (refs.2,3 ) regulates this balance in favour of mtDNA repair by localizing to mitochondria and interfering with the assembly of the mitochondrial pre-initiation transcription complex between HMG-5/TFAM and RPOM-1/mtRNAP. ATFS-1-mediated transcriptional inhibition decreases age-dependent mtDNA molecular damage through the DNA glycosylase NTH-1/NTH1, as well as the helicase TWNK-1/TWNK, resulting in an enhancement in the functional longevity of cells and protection against decline in animal behaviour caused by targeted and severe mtDNA damage. Together, our findings reveal that ATFS-1 acts as a molecular focal point for the control of balance between genome expression and maintenance in the mitochondria., (© 2023. The Author(s), under exclusive licence to Springer Nature Limited.)- Published
- 2023
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37. Variation in prognosis and treatment outcome in juvenile myoclonic epilepsy: a Biology of Juvenile Myoclonic Epilepsy Consortium proposal for a practical definition and stratified medicine classifications.
- Author
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Rubboli G, Beier CP, Selmer KK, Syvertsen M, Shakeshaft A, Collingwood A, Hall A, Andrade DM, Fong CY, Gesche J, Greenberg DA, Hamandi K, Lim KS, Ng CC, Orsini A, Striano P, Thomas RH, Zarubova J, Richardson MP, Strug LJ, and Pal DK
- Abstract
Reliable definitions, classifications and prognostic models are the cornerstones of stratified medicine, but none of the current classifications systems in epilepsy address prognostic or outcome issues. Although heterogeneity is widely acknowledged within epilepsy syndromes, the significance of variation in electroclinical features, comorbidities and treatment response, as they relate to diagnostic and prognostic purposes, has not been explored. In this paper, we aim to provide an evidence-based definition of juvenile myoclonic epilepsy showing that with a predefined and limited set of mandatory features, variation in juvenile myoclonic epilepsy phenotype can be exploited for prognostic purposes. Our study is based on clinical data collected by the Biology of Juvenile Myoclonic Epilepsy Consortium augmented by literature data. We review prognosis research on mortality and seizure remission, predictors of antiseizure medication resistance and selected adverse drug events to valproate, levetiracetam and lamotrigine. Based on our analysis, a simplified set of diagnostic criteria for juvenile myoclonic epilepsy includes the following: (i) myoclonic jerks as mandatory seizure type; (ii) a circadian timing for myoclonia not mandatory for the diagnosis of juvenile myoclonic epilepsy; (iii) age of onset ranging from 6 to 40 years; (iv) generalized EEG abnormalities; and (v) intelligence conforming to population distribution. We find sufficient evidence to propose a predictive model of antiseizure medication resistance that emphasises (i) absence seizures as the strongest stratifying factor with regard to antiseizure medication resistance or seizure freedom for both sexes and (ii) sex as a major stratifying factor, revealing elevated odds of antiseizure medication resistance that correlates to self-report of catamenial and stress-related factors including sleep deprivation. In women, there are reduced odds of antiseizure medication resistance associated with EEG-measured or self-reported photosensitivity. In conclusion, by applying a simplified set of criteria to define phenotypic variations of juvenile myoclonic epilepsy, our paper proposes an evidence-based definition and prognostic stratification of juvenile myoclonic epilepsy. Further studies in existing data sets of individual patient data would be helpful to replicate our findings, and prospective studies in inception cohorts will contribute to validate them in real-world practice for juvenile myoclonic epilepsy management., Competing Interests: G.R. received speaker honoraria from UCB, EISAI, Arvelle and consultancy honoraria from Ology Medical Education. C.P.B. received honoraria from UCB, EISAI and Arvelle and travel support from Arvelle. K.K.S. received speaker honoraria and travel support from UCB. M.S. received speakers honoraria from EISAI and Angelini Pharma. R.T. received honoraria from Arvelle/Angelini, Bial, Eisai, GW/Jazz, Sanofi, UCB Pharma, UNEEG, Zogenix., (© The Author(s) 2023. Published by Oxford University Press on behalf of the Guarantors of Brain.)
- Published
- 2023
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38. Association between intraoperative remifentanil use and postoperative hyperalgesia in adolescent idiopathic scoliosis surgery: a retrospective study.
- Author
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Hasan MS, Abdul Razak N, Yip HW, Lee ZY, Chan CYW, Kwan MK, Chiu CK, Yunus SN, and Ng CC
- Subjects
- Adolescent, Humans, Analgesia, Patient-Controlled, Anesthesia, General, Morphine Derivatives, Pain, Retrospective Studies, Postoperative Complications, Analgesics, Opioid administration & dosage, Analgesics, Opioid adverse effects, Hyperalgesia chemically induced, Remifentanil administration & dosage, Remifentanil adverse effects, Scoliosis surgery
- Abstract
Background: The liberal use of remifentanil in spine surgery has been associated with an increased incidence of postoperative hyperalgesia. Nevertheless, controversies remain as the existing evidence is inconclusive to determine the relationship between remifentanil use and the development of opioid-induced hyperalgesia. We hypothesized that intraoperative infusion of higher dose remifentanil during scoliosis surgery is associated with postoperative hyperalgesia, manifesting clinically as greater postoperative morphine consumption and pain scores., Methods: Ninety-seven patients with adolescent idiopathic scoliosis (AIS) who underwent posterior spinal fusion surgery at a single tertiary institution from March 2019 until June 2020 were enrolled in this retrospective study. Anesthesia was maintained using a target-controlled infusion of remifentanil combined with volatile anesthetic desflurane in 92 patients, while five patients received it as part of total intravenous anesthesia. Intravenous ketamine, paracetamol, and fentanyl were administered as multimodal analgesia. All patients received patient-controlled analgesia (PCA) morphine postoperatively. Pain scores at rest and on movement, assessed using the numerical rating scale, and the cumulative PCA morphine consumption were collected at a six-hourly interval for up to 48 h. According to the median intraoperative remifentanil dose usage of 0.215 µg/kg/min, patients were divided into two groups: low dose and high dose group., Results: There were no significant differences in the pain score and cumulative PCA morphine consumption between the low and high dose remifentanil group. The mean duration of remifentanil infusion was 134.9 ± 22.0 and 123.4 ± 23.7 min, respectively., Conclusion: Intraoperative use of remifentanil as an adjuvant in AIS patients undergoing posterior spinal fusion surgery was not associated with postoperative hyperalgesia., (© 2023. The Author(s).)
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- 2023
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39. NIVOLUMAB-INDUCED HARADA-LIKE UVEITIS WITH BACILLARY DETACHMENT MIMICKING CHOROIDAL METASTASIS.
- Author
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Ng CC, Ng JC, Johnson RN, McDonald HR, and Agarwal A
- Subjects
- Female, Humans, Middle Aged, Nivolumab adverse effects, Fluorescein Angiography, Tomography, Optical Coherence, Uveomeningoencephalitic Syndrome drug therapy, Carcinoma, Renal Cell, Bacillus, Uveitis
- Abstract
Purpose: To describe a patient with metastatic clear cell renal cell carcinoma in remission on maintenance nivolumab therapy who developed late-onset ocular toxicity manifesting as creamy chorioretinal lesions with exudative retinal detachment concerning for choroidal metastasis., Method: Case report. Main outcome measures include ophthalmoscopic examination, fundus photography, fundus autofluorescence, fluorescein angiography, indocyanine green angiography, spectral domain optical coherence tomography, and B-scan ultrasonography., Results: A 49-year-old woman with a medical history of metastatic clear cell renal cell carcinoma in remission for two years after immunotherapy with four cycles of ipilimumab and nivolumab followed by maintenance nivolumab infusions developed lesions concerning for choroidal metastases in her right eye. Optical coherence tomography of the lesions revealed a bacillary layer detachment containing possible fibrinous exudate organized into layers and underlying choroidal thickening with chorioretinal folds. Later, choroidal thickening and chorioretinal folds also occurred in the left eye. Given that pan imaging detected no metastasis and the posterior segment abnormalities resolved after cessation of nivolumab and treatment with systemic corticosteroids, the patient was diagnosed with nivolumab-induced Vogt-Koyanagi-Harada-like uveitis., Conclusion: This case expands on the clinical spectrum of nivolumab-induced Vogt-Koyanagi-Harada-like uveitis, a condition that can also present with bacillary layer detachment mimicking an early choroidal metastasis, manifest asymmetrically in each eye, and develop after long-standing treatment.
- Published
- 2023
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40. Spatial transcriptomics reveal topological immune landscapes of Asian head and neck angiosarcoma.
- Author
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Loh JW, Lee JY, Lim AH, Guan P, Lim BY, Kannan B, Lee ECY, Gu NX, Ko TK, Ng CC, Lim JCT, Yeong J, Lim JQ, Ong CK, Teh BT, and Chan JY
- Subjects
- Humans, Transcriptome, Gene Expression Profiling, Tumor Microenvironment genetics, Hemangiosarcoma genetics, Hemangiosarcoma metabolism, Hemangiosarcoma pathology
- Abstract
Angiosarcomas are rare malignant tumors of the endothelium, arising commonly from the head and neck region (AS-HN) and recently associated with ultraviolet (UV) exposure and human herpesvirus-7 infection. We examined 81 cases of angiosarcomas, including 47 cases of AS-HN, integrating information from whole genome sequencing, gene expression profiling and spatial transcriptomics (10X Visium). In the AS-HN cohort, we observed recurrent somatic mutations in CSMD3 (18%), LRP1B (18%), MUC16 (18%), POT1 (16%) and TP53 (16%). UV-positive AS-HN harbored significantly higher tumor mutation burden than UV-negative cases (p = 0.0294). NanoString profiling identified three clusters with distinct tumor inflammation signature scores (p < 0.001). Spatial transcriptomics revealed topological profiles of the tumor microenvironment, identifying dominant but tumor-excluded inflammatory signals in immune-hot cases and immune foci even in otherwise immune-cold cases. In conclusion, spatial transcriptomics reveal the tumor immune landscape of angiosarcoma, and in combination with multi-omic information, may improve implementation of treatment strategies., (© 2023. The Author(s).)
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- 2023
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41. Is pre-stroke frailty as determined by the Clinical Frailty Scale version 2.0 associated with stroke outcomes?
- Author
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Ng CC, Lim WC, Tan KM, Wong KY, Kanagarajah RR, Singh HSAK, and Tan WG
- Abstract
Competing Interests: None
- Published
- 2023
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42. CATASTROPHIC, BILATERAL RETINAL VASCULAR OCCLUSION AFTER INTRAVITREAL BEVACIZUMAB INJECTION.
- Author
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Ng CC, Brill D, Cunningham ET Jr, Burckhard BA, Jumper JM, Heier J, Rifkin LM, Eliott D, McDonald HR, and Sobrin L
- Subjects
- Male, Female, Humans, Infant, Newborn, Aged, Aged, 80 and over, Bevacizumab, Antibodies, Monoclonal, Humanized adverse effects, Vascular Endothelial Growth Factor A, Intravitreal Injections, Fluorescein Angiography, Inflammation, Angiogenesis Inhibitors therapeutic use, Retinal Diseases chemically induced
- Abstract
Purpose: To describe two cases of catastrophic, bilateral retinal vascular occlusion after intravitreal (IVT) bevacizumab injection., Methods: Case series. Main outcome measures included clinical and fluorescein angiography findings., Results: Case 1-A 65-year-old woman with calcinosis, Raynaud phenomenon, esophageal dysfunction, sclerodactyly, and telangiectasis syndrome developed acute, severe, bilateral visual loss 2 weeks after bilateral IVT bevacizumab injection for proliferative diabetic retinopathy. Examination and fluorescein angiography revealed moderate anterior chamber inflammation, bilateral perivascular retinal hemorrhages, and near total retinal vascular occlusion. Extensive testing revealed moderately elevated anti-B2 glycoprotein (antiphospholipid) antibodies. Case 2-An 85-year-old man with polymyalgia rheumatica and left eye exudative age-related macular degeneration experienced severe, bilateral, sequential visual loss in the left eye and then right eye approximately 3 weeks after IVT bevacizumab left eye injection. Examination revealed bilateral panuveitis, diffuse perivascular exudates, and intraretinal hemorrhages. Fluorescein angiography showed diffuse venous leakage. Extensive testing revealed an elevated antinuclear antibody and mildly elevated anticardiolipin antibody., Conclusion: Patients with underlying retinal vascular vulnerabilities may be at increased risk of catastrophic, bilateral retinal vascular occlusion after treatment with IVT bevacizumab. The moderate-to-severe intraocular inflammation in both cases and the contralateral involvement after unilateral IVT injection in Case 2 suggest a possible delayed immune-mediated mechanism.
- Published
- 2023
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43. Genetic interaction between GABRA1 and ERBB4 variants in the pathogenesis of genetic generalized epilepsy.
- Author
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Chan CK, Lim KS, Low SK, Tan CT, and Ng CC
- Subjects
- Humans, Seizures, Family, Receptors, GABA-A genetics, Receptors, GABA-A chemistry, gamma-Aminobutyric Acid, Receptor, ErbB-4 genetics, Epilepsy, Generalized genetics, Epilepsy genetics
- Abstract
Epilepsy is a complex neurological disease that can be caused by both genetic and environmental factors. Many studies have been conducted to investigate the genetic risk variants and molecular mechanisms of epilepsy. Disruption of excitation-inhibition balance (E/I balance) is one of the widely accepted disease mechanisms of epilepsy. The maintenance of E/I balance is an intricate process that is governed by multiple proteins. Using whole exome sequencing (WES), we identified a novel GABRA1 c.448G>A (p.E150K) variant and ERBB4 c.1972A>T (p.I658F, rs190654033) variant in a Malaysian Chinese family with genetic generalized epilepsy (GGE). The GGE may be triggered by dysregulation of E/I balance mechanism. Segregation of the variants in the family was verified by Sanger sequencing. All family members with GGE inherited both variants. However, family members who carried only one of the variants did not show any symptoms of GGE. Both the GABRA1 and ERBB4 variants were predicted damaging by MutationTaster and CADD, and protein structure analysis showed that the variants had resulted in the formation of additional hydrogen bonds in the mutant proteins. GABRA1 variant could reduce the efficiency of GABA
A receptors, and constitutively active ERBB4 receptors caused by the ERBB4 variant promote internalization of GABAA receptors. The interaction between the two variants may cause a greater disruption in E/I balance, which is more likely to induce a seizure. Nevertheless, this disease model was derived from a single small family, further studies are still needed to confirm the verifiability of the purported disease model., (Copyright © 2022 Elsevier B.V. All rights reserved.)- Published
- 2023
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44. VOGT-KOYANAGI-HARADA-LIKE UVEITIS FOLLOWED BY MELANOMA-ASSOCIATED RETINOPATHY WITH FOCAL CHORIORETINAL ATROPHY AND CHOROIDAL NEOVASCULARIZATION IN A PATIENT WITH METASTATIC CUTANEOUS MELANOMA.
- Author
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Ng CC, Alsberge JB, Qian Y, Freund KB, and Cunningham ET Jr
- Subjects
- Male, Humans, Aged, Fluorescein Angiography, Atrophy, Melanoma, Cutaneous Malignant, Melanoma complications, Skin Neoplasms complications, Skin Neoplasms pathology, Uveomeningoencephalitic Syndrome complications, Uveomeningoencephalitic Syndrome diagnosis, Paraneoplastic Syndromes, Ocular diagnosis, Uveitis, Choroidal Neovascularization
- Abstract
Purpose: To report a case of Vogt-Koyanagi-Harada-like uveitis followed by melanoma-associated retinopathy with focal chorioretinal atrophy and subsequent choroidal neovascularization in a patient with metastatic cutaneous melanoma., Method: Case report. Main outcome measures include external photography, anterior segment photography, ophthalmoscopic examination, fundus photography, fluorescein angiography, indocyanine green angiography, spectral domain optical coherence tomography, optical coherence tomography angiography, and electroretinography., Results: A 68-year-old man with a history cutaneous melanoma presented with Vogt-Koyanagi-Harada-like uveitis. Work-up revealed a pelvic mass, which was excised and found to be metastatic melanoma. Two years later, the patient developed melanoma-associated retinopathy with focal chorioretinal atrophy and adjacent choroidal neovascularization., Conclusion: Patients with metastatic cutaneous melanoma can develop distinct and sequential paraneoplastic ocular complications. Onset of a Vogt-Koyanagi-Harada-like uveitis may be a good prognostic factor for survival in patients with metastatic cutaneous melanoma., (Copyright © 2021 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the Opthalmic Communications Society, Inc.)
- Published
- 2023
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45. OCULAR INJURIES ASSOCIATED WITH ELASTIC EXERCISE BANDS.
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Ng CC, Carrera W, Peng MY, Agarwal A, Chen JJ, Johnson RN, Jumper JM, and McDonald HR
- Subjects
- Humans, Visual Acuity, Vitreous Hemorrhage surgery, Retrospective Studies, Eye Injuries diagnosis, Eye Injuries complications, Wounds, Nonpenetrating complications, Wounds, Nonpenetrating diagnosis, Wounds, Nonpenetrating therapy
- Abstract
Purpose: To discuss the mechanism of injury and characterize the clinical features of ocular trauma associated with elastic cord exercise equipment band injuries in a consecutive series of patients seen at a single vitreoretinal surgery practice., Methods: We performed a retrospective review of all patients who were treated for blunt trauma from 2013 to 2020 at a single vitreoretinal practice., Results: Thirteen eyes from 11 patients met the inclusion criteria of possessing ocular trauma secondary to recoil from exercise bands. Presenting visual acuity ranged from 20/16 to HM (median: 20/32). The most frequently observed anterior segment pathologies were traumatic iritis (54%) and angle recession (31%). The most common posterior segment findings were vitreous hemorrhage (54%) and peripheral commotio retinae (54%). Three eyes (23%) required surgical intervention. Follow-up intervals ranged from 0 to 10 months (median: 1.75 months). Visual acuity at last examination ranged from 20/13 to 20/400 (median: 20/40)., Conclusion: A wide spectrum of serious ocular injuries requiring medical and surgical intervention can result from this form of blunt ocular trauma. The frequency of this event would be decreased by the use of sports goggles and careful inspection of equipment for wear and over use., (Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the Opthalmic Communications Society, Inc.)
- Published
- 2022
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46. A comprehensive next generation sequencing tissue assay for Asian-prevalent cancers-Analytical validation and performance evaluation with clinical samples.
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Ng CC, Lim S, Lim AH, Md Nasir ND, Zhang J, Rajasegaran V, Lee JY, Kok JST, Thike AA, Lim JX, Weng R, Yee S, Choudhury Y, Chan JY, Tan PH, Tan MH, and Teh BT
- Abstract
Introduction: A well-validated diagnostic assay with curated biomarkers complements clinicopathological factors to facilitate early diagnosis and ensure timely treatment delivery. This study focuses on an Asian-centric cancer diagnostic assay designed and thoroughly validated against commercially available standard references and a cohort of over 200 clinical specimens spanning 12 diverse Asian-centric cancer types. Methods: The assay uses hybrid-capture probes capable of profiling DNA aberrations from 572 cancer-related genes and 91 RNA fusion partners. The panel can detect clinically-tractable biomarkers such as microsatellite instability (MSI) and tumor mutation burden (TMB). Results: Analytical evaluation demonstrated 100% specificity and 99.9% sensitivity within a ≥5% VAF limit of detection (LoD) for SNV/Indels. RNA-based fusion features an LoD of ≥5 copies per nanogram input when evaluated against commercial references. Excellent linearity and concordance were observed when benchmarking against orthogonal methods in identifying MSI status, TMB scores and RNA fusions. Actionable genetic alterations were identified in 65% of the clinical samples. Conclusion: These results demonstrate a molecular diagnostic assay that accurately detects genomic alterations and complex biomarkers. The data also supports an excellent performance of this assay for making critical diagnoses and well-informed therapeutic decisions in Asian prevalent cancers., Competing Interests: M-HT and YC are employees of and hold stock ownership in Lucence Diagnostics Pte Ltd. The remaining 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 Ng, Lim, Lim, Md Nasir, Zhang, Rajasegaran, Lee, Kok, Thike, Lim, Weng, Yee, Choudhury, Chan, Tan, Tan and Teh.)
- Published
- 2022
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47. Gene expression profiling and in vitro functional studies reveal RAD54L as a potential therapeutic target in multiple myeloma.
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Bong IPN, Ng CC, Othman N, and Esa E
- Subjects
- Cell Cycle Proteins genetics, Cell Line, Tumor, Cell Proliferation genetics, DNA Helicases genetics, DNA-Binding Proteins genetics, Gene Expression Profiling methods, Gene Silencing, Humans, Microtubule-Associated Proteins genetics, Microtubule-Associated Proteins metabolism, Shc Signaling Adaptor Proteins genetics, Shc Signaling Adaptor Proteins metabolism, Multiple Myeloma genetics, Multiple Myeloma metabolism
- Abstract
Background: Current advances in the molecular biology of multiple myeloma (MM) are not sufficient to fully delineate the genesis and development of this disease., Objective: This study aimed to identify molecular targets underlying MM pathogenesis., Methods: mRNA expression profiling for 29 samples (19 MM samples, 7 MM cell lines and 3 controls) were obtained using microarray. We evaluated the in vitro effects of RAD54L gene silencing on the proliferation, apoptosis and cell cycle distribution in KMS-28BM human MM cells using siRNA approach. Cell proliferation was determined by MTS assay while apoptosis and cell cycle distribution were analysed with flow cytometry. Gene and protein expression was evaluated using RT-qPCR and ELISA, respectively., Results: Microarray results revealed a total of 5124 differentially expressed genes (DEGs), in which 2696 and 2428 genes were up-regulated and down-regulated in MM compared to the normal controls, respectively (fold change ≥ 2.0; P < 0.05). Up-regulated genes (RAD54L, DIAPH3, SHCBP1, SKA3 and ANLN) and down-regulated genes (HKDC1, RASGRF2, CYSLTR2) have never been reported in association with MM. Up-regulation of RAD54L was further verified by RT-qPCR (P < 0.001). In vitro functional studies revealed that RAD54L gene silencing significantly induced growth inhibition, apoptosis (small changes) and cell cycle arrest in G0/G1 phase in KMS-28BM (P < 0.05). Silencing of RAD54L also decreased its protein level (P < 0.05)., Conclusions: This study has identified possible molecular targets underlying the pathogenesis of MM. For the first time, we reveal RAD54L as a potential therapeutic target in MM, possibly functioning in the cell cycle and checkpoint control., (© 2022. The Author(s).)
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- 2022
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48. The Multi-Dimensional Biomarker Landscape in Cancer Immunotherapy.
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Lee JY, Kannan B, Lim BY, Li Z, Lim AH, Loh JW, Ko TK, Ng CC, and Chan JY
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- Biomarkers, Tumor, Humans, Immunity, Tumor Microenvironment, Immunotherapy methods, Neoplasms genetics
- Abstract
The field of immuno-oncology is now at the forefront of cancer care and is rapidly evolving. The immune checkpoint blockade has been demonstrated to restore antitumor responses in several cancer types. However, durable responses can be observed only in a subset of patients, highlighting the importance of investigating the tumor microenvironment (TME) and cellular heterogeneity to define the phenotypes that contribute to resistance as opposed to those that confer susceptibility to immune surveillance and immunotherapy. In this review, we summarize how some of the most widely used conventional technologies and biomarkers may be useful for the purpose of predicting immunotherapy outcomes in patients, and discuss their shortcomings. We also provide an overview of how emerging single-cell spatial omics may be applied to further advance our understanding of the interactions within the TME, and how these technologies help to deliver important new insights into biomarker discovery to improve the prediction of patient response.
- Published
- 2022
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49. The clinical and imaging features of FLNA positive and negative periventricular nodular heterotopia.
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Lu YT, Hsu CY, Liu YT, Chan CK, Chuang YC, Lin CH, Chang KP, Ho CJ, Ng CC, Lim KS, and Tsai MH
- Subjects
- Brain, Electroencephalography, Female, Filamins genetics, Humans, Magnetic Resonance Imaging, Male, Epilepsy, Periventricular Nodular Heterotopia diagnostic imaging, Periventricular Nodular Heterotopia genetics
- Abstract
Background: Periventricular nodular heterotopia (PVNH) is caused by abnormal neuronal migration, resulting in the neurons accumulate as nodules along the surface of the lateral ventricles. PVNH often cause epilepsy, psychomotor development or cognition problem. Mutations in FLNA (Filamin A) is the most common underlying genetic etiology. Our purpose is to delineate the clinical and imaging spectrum that differentiates FLNA-positive and FLNA-negative PVNH patients., Methods: We included 21 patients with confirmed PVNH. The detailed clinical information, electroencephalography, and other clinical findings were recorded. Detailed brain MR imaging was assessed. Mutation analysis of the FLNA gene was used Sanger sequencing or a next generation sequencing based assay., Results: FLNA mutations were identified in 9 patients (7 females and 2 males), including two nonsense, two splice site, three frameshift, and two missense mutations. In FLNA-positive group, 8 patients had anterior predominant bilateral symmetric presentation and only one had asymmetrical distribution and dilated ventricles. Extra-cerebral features were more often observed in FLNA-positive group than FLNA-negative group., Conclusion: Genetics of PVNH is heterogenous, and mutations in FLNA gene account for less than half of the patients in our cohort. Our finding between FLNA-positive and FLNA-negative patients could guide the clinicians to select relevant genetic testing., Competing Interests: Conflicts of interest There is no conflict of interest regarding the publication of this study., (Copyright © 2021 Chang Gung University. Published by Elsevier B.V. All rights reserved.)
- Published
- 2022
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50. Therapeutic and immunomodulatory potential of pazopanib in malignant phyllodes tumor.
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Ng DYX, Li Z, Lee E, Kok JST, Lee JY, Koh J, Ng CC, Lim AH, Liu W, Ng SR, Lim KS, Huang XX, Hong JH, Guan P, Sim Y, Thike AA, Nasir NDM, Li S, Tan PH, Teh BT, and Chan JY
- Abstract
Malignant phyllodes tumors (PT) are rare aggressive fibroepithelial neoplasms with high metastatic potential and lack effective therapy. We established a patient-derived xenograft (PDX) and cell line model (designated MPT-S1) of malignant PT which demonstrated clinical response to pazopanib. Whole exome sequencing identified somatic mutations in TP53, RB1, MED12, and KMT2D. Immunohistochemistry and genomic profiles of the tumor, PDX and cell line were concordant. In keeping with clinical observation, pazopanib reduced cell viability in a dose-dependent manner and evoked apoptosis, and led to significant abrogation of in vivo tumor growth. Whole transcriptomic analysis revealed that pazopanib decreased expression of genes involved in oncogenic and apoptosis signaling. We also observed decreased expression of ENPP1, with known roles in cancer invasion and metastasis, as well as STING pathway upregulation. Accordingly, pazopanib induced micronuclei formation, and evoked phospho-TBK1 and PD-L1 expression. In an additional cohort of malignant PT (n = 14), six (42.9%) showed comparable or higher levels of ENPP1 relative to MPT-S1, highlighting its potential role as a therapeutic target. In conclusion, we established MPT-S1, a new PDX and cell line model, and provided evidence for the clinical efficacy of pazopanib in malignant PT., (© 2022. The Author(s).)
- Published
- 2022
- Full Text
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