195 results on '"Ka-Fai To"'
Search Results
2. Cellular zinc metabolism and zinc signaling: from biological functions to diseases and therapeutic targets
- Author
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Chen, Bonan, primary, Yu, Peiyao, additional, Chan, Wai Nok, additional, Xie, Fuda, additional, Zhang, Yigan, additional, Liang, Li, additional, Leung, Kam Tong, additional, Lo, Kwok Wai, additional, Yu, Jun, additional, Tse, Gary M. K., additional, Kang, Wei, additional, and To, Ka Fai, additional
- Published
- 2024
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3. The nerve cells in gastrointestinal cancers: from molecular mechanisms to clinical intervention
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Lyu, Yang, primary, Xie, Fuda, additional, Chen, Bonan, additional, Shin, Wing Sum, additional, Chen, Wei, additional, He, Yulong, additional, Leung, Kam Tong, additional, Tse, Gary M. K., additional, Yu, Jun, additional, To, Ka Fai, additional, and Kang, Wei, additional
- Published
- 2023
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4. A longitudinal study on the change in sleep across three waves of the COVID-19 outbreaks in Hong Kong
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Cheung, Denise Shuk Ting, primary, Yu, Branda Yee-Man, additional, Lam, Simon Ching, additional, Leung, Doris Yin Ping, additional, Chung, Ka-Fai, additional, Ho, Fiona Yan-Yee, additional, Chen, Shu-Cheng, additional, and Yeung, Wing-Fai, additional
- Published
- 2023
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5. A universal metasurface antenna to manipulate all fundamental characteristics of electromagnetic waves
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Wu, Geng-Bo, primary, Dai, Jun Yan, additional, Shum, Kam Man, additional, Chan, Ka Fai, additional, Cheng, Qiang, additional, Cui, Tie Jun, additional, and Chan, Chi Hou, additional
- Published
- 2023
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6. Artificial intelligence in orthodontics and orthognathic surgery: a bibliometric analysis of the 100 most-cited articles
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Wong, Ka Fai, primary, Lam, Xiang Yao, additional, Jiang, Yuhao, additional, Yeung, Andy Wai Kan, additional, and Lin, Yifan, additional
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- 2023
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7. Magnetic resonance imaging parameters on lacrimal gland in thyroid eye disease: a systematic review and meta-analysis
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Wong, Nicole Tsz Yan, primary, Yuen, Ka Fai Kevin, additional, Aljufairi, Fatema Mohamed Ali Abdulla, additional, Lai, Kenneth Ka Hei, additional, Hu, Zhichao, additional, Chan, Karen Kar Wun, additional, Tham, Clement Chee Yung, additional, Pang, Chi Pui, additional, and Chong, Kelvin Kam Lung, additional
- Published
- 2023
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8. Identification of GRIN2D as a novel therapeutic target in pancreatic ductal adenocarcinoma
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Wang, Jiatong, primary, Wong, Chi Hin, additional, Zhu, Yinxin, additional, Yao, Xiaoqiang, additional, Ng, Kelvin K C, additional, Zhou, Chengzhi, additional, To, Ka Fai, additional, and Chen, Yangchao, additional
- Published
- 2023
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9. MLK4 promotes glucose metabolism in lung adenocarcinoma through CREB-mediated activation of phosphoenolpyruvate carboxykinase and is regulated by KLF5
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Cheung, Alvin Ho-Kwan, primary, Wong, Kit-Yee, additional, Liu, Xiaoli, additional, Ji, Fenfen, additional, Hui, Chris Ho-Lam, additional, Zhang, Yihan, additional, Kwan, Johnny Sheung-Him, additional, Chen, Bonan, additional, Dong, Yujuan, additional, Lung, Raymond Wai-Ming, additional, Yu, Jun, additional, Lo, Kwok Wai, additional, Wong, Chi Chun, additional, Kang, Wei, additional, and To, Ka-Fai, additional
- Published
- 2023
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10. An Optimized Fixed Equalizer for Speech Enhancement
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Qi He, Siow Yong Low, and Ka Fai Cedric Yiu
- Subjects
Applied Mathematics ,Signal Processing - Published
- 2022
11. Gut microbiome dysbiosis across early Parkinson’s disease, REM sleep behavior disorder and their first-degree relatives
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Huang, Bei, primary, Chau, Steven W. H., additional, Liu, Yaping, additional, Chan, Joey W. Y., additional, Wang, Jing, additional, Ma, Suk Ling, additional, Zhang, Jihui, additional, Chan, Paul K. S., additional, Yeoh, Yun Kit, additional, Chen, Zigui, additional, Zhou, Li, additional, Wong, Sunny Hei, additional, Mok, Vincent C. T., additional, To, Ka Fai, additional, Lai, Hei Ming, additional, Ng, Simon, additional, Trenkwalder, Claudia, additional, Chan, Francis K. L., additional, and Wing, Yun Kwok, additional
- Published
- 2023
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12. Acupuncture for chemotherapy-associated insomnia in breast cancer patients: an assessor-participant blinded, randomized, sham-controlled trial
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Zhang, Jialing, primary, Qin, Zongshi, additional, So, Tsz Him, additional, Chang, Tien Yee, additional, Yang, Sichang, additional, Chen, Haiyong, additional, Yeung, Wing Fai, additional, Chung, Ka Fai, additional, Chan, Pui Yan, additional, Huang, Yong, additional, Xu, Shifen, additional, Chiang, Chun Yuan, additional, Lao, Lixing, additional, and Zhang, Zhang-Jin, additional
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- 2023
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13. Smad3 is essential for polarization of tumor-associated neutrophils in non-small cell lung carcinoma
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Chung, Jeff Yat-Fai, primary, Tang, Philip Chiu-Tsun, additional, Chan, Max Kam-Kwan, additional, Xue, Vivian Weiwen, additional, Huang, Xiao-Ru, additional, Ng, Calvin Sze-Hang, additional, Zhang, Dongmei, additional, Leung, Kam-Tong, additional, Wong, Chun-Kwok, additional, Lee, Tin-Lap, additional, Lam, Eric W-F, additional, Nikolic-Paterson, David J., additional, To, Ka-Fai, additional, Lan, Hui-Yao, additional, and Tang, Patrick Ming-Kuen, additional
- Published
- 2023
- Full Text
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14. Gut microbiome dysbiosis across early Parkinson’s disease, REM sleep behavior disorder and their first-degree relatives
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Bei Huang, Steven W. H. Chau, Yaping Liu, Joey W. Y. Chan, Jing Wang, Suk Ling Ma, Jihui Zhang, Paul K. S. Chan, Yun Kit Yeoh, Zigui Chen, Li Zhou, Sunny Hei Wong, Vincent C. T. Mok, Ka Fai To, Hei Ming Lai, Simon Ng, Claudia Trenkwalder, Francis K. L. Chan, and Yun Kwok Wing
- Subjects
Multidisciplinary ,General Physics and Astronomy ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology - Abstract
The microbiota-gut-brain axis has been suggested to play an important role in Parkinson’s disease (PD). Here we performed a cross-sectional study to profile gut microbiota across early PD, REM sleep behavior disorder (RBD), first-degree relatives of RBD (RBD-FDR), and healthy controls, which could reflect the gut-brain staging model of PD. We show gut microbiota compositions are significantly altered in early PD and RBD compared with control and RBD-FDR. Depletion of butyrate-producing bacteria and enrichment of pro-inflammatory Collinsella have already emerged in RBD and RBD-FDR after controlling potential confounders including antidepressants, osmotic laxatives, and bowel movement frequency. Random forest modelling identifies 12 microbial markers that are effective to distinguish RBD from control. These findings suggest that PD-like gut dysbiosis occurs at the prodromal stages of PD when RBD develops and starts to emerge in the younger RBD-FDR subjects. The study will have etiological and diagnostic implications.
- Published
- 2023
15. Acupuncture for chemotherapy-associated insomnia in breast cancer patients: an assessor-participant blinded, randomized, sham-controlled trial
- Author
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Jialing Zhang, Zongshi Qin, Tsz Him So, Tien Yee Chang, Sichang Yang, Haiyong Chen, Wing Fai Yeung, Ka Fai Chung, Pui Yan Chan, Yong Huang, Shifen Xu, Chun Yuan Chiang, Lixing Lao, and Zhang-Jin Zhang
- Abstract
Background Insomnia is a highly prevalent symptom occurred during and post-chemotherapy. Acupuncture may have beneficial effects in the management of chemotherapy-associated insomnia. This study was conducted to determine the efficacy and safety of acupuncture in improving chemotherapy-associated insomnia in breast cancer patients. Methods This assessor-participant blinded, randomized, sham-controlled trial was conducted from November 2019 to January 2022 (follow-up completed July 2022). Participants were referred by oncologists from two Hong Kong hospitals. Assessments and interventions were conducted at the outpatient clinic of School of Chinese Medicine, the University of Hong Kong. The 138 breast cancer patients with chemotherapy-associated insomnia were randomly assigned to receive either 15 sessions of active acupuncture regimen by combining needling into body acupoints and acupressure on auricular acupoints or sham acupuncture control (69 each) for 18 weeks, followed by 24 weeks of follow-up. The primary outcome was measured using Insomnia Severity Index (ISI). Secondary outcomes included the Pittsburgh Sleep Quality Index, Actiwatch and sleep diary for sleep parameters, depression and anxiety, fatigue and pain, and quality of life. Results There were 87.7% (121/138) participants who completed the primary endpoint (week-6). The active acupuncture regimen was not superior to the sham control in reducing ISI score from baseline to 6 weeks (mean difference: − 0.4, 95% CI − 1.8–1.1; P = 0.609), but produced short-term treatment and long-term follow-up better outcomes in improving sleep onset latency, total sleep time, sleep efficiency, anxiety, depression, and quality of life. Participants of the active acupuncture group had a pronouncedly higher cessation rate of sleeping medications than the sham control (56.5% vs. 14.3%, P = 0.011). All treatment-related adverse events were mild. No participants discontinued treatments due to adverse events. Conclusion The active acupuncture regimen could be considered as an effective option for the management of chemotherapy-associated insomnia. It also could serve as a tapering approach to reduce and even replace the use of sleeping medications in breast cancer patients. Trial registrationClinicaltrials.gov: NCT04144309. Registered 30 October 2019.
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- 2023
16. Smad3 is essential for polarization of tumor-associated neutrophils in non-small cell lung carcinoma
- Author
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Jeff Yat-Fai Chung, Philip Chiu-Tsun Tang, Max Kam-Kwan Chan, Vivian Weiwen Xue, Xiao-Ru Huang, Calvin Sze-Hang Ng, Dongmei Zhang, Kam-Tong Leung, Chun-Kwok Wong, Tin-Lap Lee, Eric W-F Lam, David J. Nikolic-Paterson, Ka-Fai To, Hui-Yao Lan, and Patrick Ming-Kuen Tang
- Subjects
Multidisciplinary ,General Physics and Astronomy ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology - Abstract
Neutrophils are dynamic with their phenotype and function shaped by the microenvironment, such as the N1 antitumor and N2 pro-tumor states within the tumor microenvironment (TME), but its regulation remains undefined. Here we examine TGF-β1/Smad3 signaling in tumor-associated neutrophils (TANs) in non-small cell lung carcinoma (NSCLC) patients. Smad3 activation in N2 TANs is negatively correlate with the N1 population and patient survival. In experimental lung carcinoma, TANs switch from a predominant N2 state in wild-type mice to an N1 state in Smad3-KO mice which associate with enhanced neutrophil infiltration and tumor regression. Neutrophil depletion abrogates the N1 anticancer phenotype in Smad3-KO mice, while adoptive transfer of Smad3-KO neutrophils reproduces this protective effect in wild-type mice. Single-cell analysis uncovers a TAN subset showing a mature N1 phenotype in Smad3-KO TME, whereas wild-type TANs mainly retain an immature N2 state due to Smad3. Mechanistically, TME-induced Smad3 target genes related to cell fate determination to preserve the N2 state of TAN. Importantly, genetic deletion and pharmaceutical inhibition of Smad3 enhance the anticancer capacity of neutrophils against NSCLC via promoting their N1 maturation. Thus, our work suggests that Smad3 signaling in neutrophils may represent a therapeutic target for cancer immunotherapy.
- Published
- 2023
17. Aberrant cholesterol metabolic signaling impairs antitumor immunosurveillance through natural killer T cell dysfunction in obese liver
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Wenshu Tang, Jingying Zhou, Weiqin Yang, Yu Feng, Haoran Wu, Myth T. S. Mok, Lingyun Zhang, Zhixian Liang, Xiaoyu Liu, Zhewen Xiong, Xuezhen Zeng, Jing Wang, Jiahuan Lu, Jingqing Li, Hanyong Sun, Xiaoyu Tian, Philip Chun Yeung, Yong Hou, Heung Man Lee, Candice C. H. Lam, Howard H. W. Leung, Anthony W. H. Chan, Ka Fai To, John Wong, Paul B. S. Lai, Kelvin K. C. Ng, Simon K. H. Wong, Vincent W. S. Wong, Alice P. S. Kong, Joseph J. Y. Sung, and Alfred S. L. Cheng
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Mammals ,Carcinoma, Hepatocellular ,Liver Neoplasms ,Immunology ,Article ,Mice ,Cholesterol ,Infectious Diseases ,Liver ,Monitoring, Immunologic ,Non-alcoholic Fatty Liver Disease ,Tumor Microenvironment ,Animals ,Humans ,Natural Killer T-Cells ,Immunology and Allergy ,Obesity - Abstract
Obesity is a major risk factor for cancers including hepatocellular carcinoma (HCC) that develops from a background of non-alcoholic fatty liver disease (NAFLD). Hypercholesterolemia is a common comorbidity of obesity. Although cholesterol biosynthesis mainly occurs in the liver, its role in HCC development of obese people remains obscure. Using high-fat high-carbohydrate diet-associated orthotopic and spontaneous NAFLD-HCC mouse models, we found that hepatic cholesterol accumulation in obesity selectively suppressed natural killer T (NKT) cell-mediated antitumor immunosurveillance. Transcriptome analysis of human liver revealed aberrant cholesterol metabolism and NKT cell dysfunction in NAFLD patients. Notably, cholesterol-lowering rosuvastatin restored NKT expansion and cytotoxicity to prevent obesogenic diet-promoted HCC development. Moreover, suppression of hepatic cholesterol biosynthesis by a mammalian target of rapamycin (mTOR) inhibitor vistusertib preceded tumor regression, which was abolished by NKT inactivation but not CD8(+) T cell depletion. Mechanistically, sterol regulatory element-binding protein 2 (SREBP2)-driven excessive cholesterol production from hepatocytes induced lipid peroxide accumulation and deficient cytotoxicity in NKT cells, which were supported by findings in people with obesity, NAFLD and NAFLD-HCC. This study highlights mTORC1/SREBP2/cholesterol-mediated NKT dysfunction in the tumor-promoting NAFLD liver microenvironment, providing intervention strategies that invigorating NKT cells to control HCC in the obesity epidemic.
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- 2022
18. Nasopharyngeal carcinoma: an evolving paradigm
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Lili Li, Anthony T.C. Chan, Wai Kei Jacky Lam, Qian Tao, Kwan Chee Allen Chan, Brigette B.Y. Ma, Edwin P. Hui, Ann D. King, Ka Fai To, David Michael Johnson, Kwok Wai Lo, and Kenneth C.W. Wong
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0301 basic medicine ,Oncology ,medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Head and neck cancer ,Cancer ,Translational research ,Context (language use) ,medicine.disease ,Clinical trial ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,Cancer immunotherapy ,Nasopharyngeal carcinoma ,030220 oncology & carcinogenesis ,Internal medicine ,medicine ,business ,Epigenomics - Abstract
The past three decades have borne witness to many advances in the understanding of the molecular biology and treatment of nasopharyngeal carcinoma (NPC), an Epstein–Barr virus (EBV)-associated cancer endemic to southern China, southeast Asia and north Africa. In this Review, we provide a comprehensive, interdisciplinary overview of key research findings regarding NPC pathogenesis, treatment, screening and biomarker development. We describe how technological advances have led to the advent of proton therapy and other contemporary radiotherapy approaches, and emphasize the relentless efforts to identify the optimal sequencing of chemotherapy with radiotherapy through decades of clinical trials. Basic research into the pathogenic role of EBV and the genomic, epigenomic and immune landscape of NPC has laid the foundations of translational research. The latter, in turn, has led to the development of new biomarkers and therapeutic targets and of improved approaches for individualizing immunotherapy and targeted therapies for patients with NPC. We provide historical context to illustrate the effect of these advances on treatment outcomes at present. We describe current preclinical and clinical challenges and controversies in the hope of providing insights for future investigation. Nasopharyngeal carcinoma (NPC) is an Epstein–Barr virus (EBV)-associated malignancy endemic to southern China, southeast Asia and north Africa. The authors of this Review present a comprehensive overview of advances from the past three decades on the pathogenic role of EBV, and the genomic, epigenomic and immune landscape of NPC, which have led to the development of new biomarkers, therapeutic targets and improved treatment approaches for patients with NPC.
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- 2021
19. Author Correction: Whole-genome profiling of nasopharyngeal carcinoma reveals viral-host co-operation in inflammatory NF-κB activation and immune escape
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Jeff P. Bruce, Ka-Fai To, Vivian W. Y. Lui, Grace T. Y. Chung, Yuk-Yu Chan, Chi Man Tsang, Kevin Y. Yip, Brigette B. Y. Ma, John K. S. Woo, Edwin P. Hui, Michael K. F. Mak, Sau-Dan Lee, Chit Chow, Sharmila Velapasamy, Yvonne Y. Y. Or, Pui Kei Siu, Samah El Ghamrasni, Stephenie Prokopec, Man Wu, Johnny S. H. Kwan, Yuchen Liu, Jason Y. K. Chan, C. Andrew van Hasselt, Lawrence S. Young, Christopher W. Dawson, Ian C. Paterson, Lee-Fah Yap, Sai-Wah Tsao, Fei-Fei Liu, Anthony T. C. Chan, Trevor J. Pugh, and Kwok-Wai Lo
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Multidisciplinary ,General Physics and Astronomy ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology - Published
- 2022
20. Comparison of Performance of Fabrics made of Torque-free and Conventional Ring Spun Yarn with Different Varieties of Cotton Fibres
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Yu-chun Chuang, Ka-fai Choi, Ping-yee Chu, and Chi Wai Kan
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Cotton fibre ,Materials science ,Polymers and Plastics ,General Chemical Engineering ,02 engineering and technology ,General Chemistry ,Yarn ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Ring (chemistry) ,01 natural sciences ,0104 chemical sciences ,visual_art ,visual_art.visual_art_medium ,Torque ,Composite material ,0210 nano-technology - Abstract
Performance of fabrics produced from torque-free ring spun yarns and conventional ring spun yarns with the use of three different varieties of cotton fibre (pima cotton, upland cotton and organic cotton) in terms of handle and the pilling resistance was compared. results show that fabrics produced from torque-free ring spun yarns exhibit better surface appearance, better softness and smoothness as compared to conventional ring spun yarns, irrespective of which of the three varieties of cotton was used. The greatest improvement of fabric hand was obtained by using torque-free ring spun yarns with Upland Cotton. The soft twist of the torque-free ring spun yarn did not intensify the pilling propensity but improved the pilling resistance instead.
- Published
- 2021
21. LIMK1 promotes peritoneal metastasis of gastric cancer and is a therapeutic target
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Wei Kang, Xi Kang, Sinan Zhao, Ka Fai To, Philip Wai Yan Chiu, Weixin Liu, Guiying Wang, Chi Chun Wong, Jingyu Deng, Jun Yu, Enders K.W. Ng, Weilin Li, and Han Liang
- Subjects
Male ,0301 basic medicine ,Cancer Research ,Mice, Nude ,Biology ,Article ,Metastasis ,Mice ,03 medical and health sciences ,0302 clinical medicine ,Stomach Neoplasms ,In vivo ,Cell Line, Tumor ,Oximes ,Genetics ,medicine ,Animals ,Humans ,Molecular Targeted Therapy ,Neoplasm Metastasis ,Protein Kinase Inhibitors ,Molecular Biology ,Peritoneal Neoplasms ,Cell Proliferation ,Mice, Inbred BALB C ,Sequence Analysis, RNA ,Kinase ,Imidazoles ,Lim Kinases ,Cancer ,Cell migration ,Dabrafenib ,medicine.disease ,Xenograft Model Antitumor Assays ,Survival Rate ,030104 developmental biology ,030220 oncology & carcinogenesis ,Cancer cell ,Cancer research ,Immunohistochemistry ,medicine.drug - Abstract
Peritoneal metastasis is a common form of metastasis among advanced gastric cancer patients. In this study, we reported the identification of LIM domain kinase 1 (LIMK1) as a promoter of gastric cancer peritoneal metastasis, and its potential to be a therapeutic target of dabrafenib (DAB). Using transcriptomic sequencing of paired gastric cancer peritoneal metastasis, primary tumors, and normal gastric tissues, we first unveiled that LIMK1 is selectively up-regulated in metastatic tumors. Increased LIMK1 in gastric cancer peritoneal metastasis was validated by immunohistochemistry analysis of an independent patient cohort. In vitro functional studies demonstrated that LIMK1 knockout or knockdown significantly inhibited cell migration and invasion of gastric cancer cells. LIMK1 knockout also abrogated peritoneal and liver metastases of gastric cancer cells in nude mice in vivo. Dabrafenib, a small molecule targeting LIMK1, was found to decrease cell migration and invasion of gastric cancer cells in vitro and abolish peritoneal and liver metastasis formation in vivo. Mechanistically, either LIMK1 knockout or Dabrafenib inhibited LIMK1 expression and phosphorylation of its downstream target cofilin. Taken together, our results demonstrated that LIMK1 functions as a metastasis promoter in gastric cancer by inhibiting LIMK1-p-cofilin and that Dabrafenib has the potential to serve as a novel treatment for gastric cancer peritoneal metastasis.
- Published
- 2021
22. Parvimonas micra promotes colorectal tumorigenesis and is associated with prognosis of colorectal cancer patients
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Zhao, Liuyang, primary, Zhang, Xiang, additional, Zhou, Yunfei, additional, Fu, Kaili, additional, Lau, Harry Cheuk-Hay, additional, Chun, Tommy Wai-Yiu, additional, Cheung, Alvin Ho-Kwan, additional, Coker, Olabisi Oluwabukola, additional, Wei, Hong, additional, Wu, William Ka-Kei, additional, Wong, Sunny Hei, additional, Sung, Joseph Jao-Yiu, additional, To, Ka Fai, additional, and Yu, Jun, additional
- Published
- 2022
- Full Text
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23. Author Correction: Whole-genome profiling of nasopharyngeal carcinoma reveals viral-host co-operation in inflammatory NF-κB activation and immune escape
- Author
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Bruce, Jeff P., primary, To, Ka-Fai, additional, Lui, Vivian W. Y., additional, Chung, Grace T. Y., additional, Chan, Yuk-Yu, additional, Tsang, Chi Man, additional, Yip, Kevin Y., additional, Ma, Brigette B. Y., additional, Woo, John K. S., additional, Hui, Edwin P., additional, Mak, Michael K. F., additional, Lee, Sau-Dan, additional, Chow, Chit, additional, Velapasamy, Sharmila, additional, Or, Yvonne Y. Y., additional, Siu, Pui Kei, additional, El Ghamrasni, Samah, additional, Prokopec, Stephenie, additional, Wu, Man, additional, Kwan, Johnny S. H., additional, Liu, Yuchen, additional, Chan, Jason Y. K., additional, van Hasselt, C. Andrew, additional, Young, Lawrence S., additional, Dawson, Christopher W., additional, Paterson, Ian C., additional, Yap, Lee-Fah, additional, Tsao, Sai-Wah, additional, Liu, Fei-Fei, additional, Chan, Anthony T. C., additional, Pugh, Trevor J., additional, and Lo, Kwok-Wai, additional
- Published
- 2022
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24. The cholesterol uptake regulator PCSK9 promotes and is a therapeutic target in APC/KRAS-mutant colorectal cancer
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Wong, Chi Chun, primary, Wu, Jian-Lin, additional, Ji, Fenfen, additional, Kang, Wei, additional, Bian, Xiqing, additional, Chen, Huarong, additional, Chan, Lam-Shing, additional, Luk, Simson Tsz Yat, additional, Tong, Samuel, additional, Xu, Jiaying, additional, Zhou, Qiming, additional, Liu, Dabin, additional, Su, Hao, additional, Gou, Hongyan, additional, Cheung, Alvin Ho-Kwan, additional, To, Ka Fai, additional, Cai, Zongwei, additional, Shay, Jerry W., additional, and Yu, Jun, additional
- Published
- 2022
- Full Text
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25. An Optimized Fixed Equalizer for Speech Enhancement
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He, Qi, primary, Low, Siow Yong, additional, and Yiu, Ka Fai Cedric, additional
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- 2022
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26. Round Cell Sarcoma with EWSR1-PATZ1 Fusion in the Face of a Five-Year-Old Boy: Report of a Case with Unusual Histologic Features
- Author
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Derek Tsz Wai Yau, Ka Fai To, Chit Chow, and Shun Wong
- Subjects
Male ,0301 basic medicine ,Myogenic differentiation ,Pathology ,medicine.medical_specialty ,Kruppel-Like Transcription Factors ,Case Reports ,Biology ,Round cell sarcoma ,Pathology and Forensic Medicine ,Diagnosis, Differential ,Rosette (botany) ,03 medical and health sciences ,0302 clinical medicine ,Stroma ,Round cell ,medicine ,Humans ,Sarcoma ,Histology ,medicine.disease ,Repressor Proteins ,030104 developmental biology ,Oncology ,Otorhinolaryngology ,Child, Preschool ,030220 oncology & carcinogenesis ,Immunohistochemistry ,Facial Neoplasms ,RNA-Binding Protein EWS - Abstract
Round cell sarcomas with EWSR1-PATZ1 fusion are rare polyphenotypic sarcomas that typically show both neural and myogenic differentiation on immunohistochemistry. The histology features lobular admixture of cellular fascicles of relatively monotonous spindle cells and small blue round cells separated by fibrotic stroma. The clinical behavior of EWSR1-PATZ1 sarcoma is uncertain currently with mixed outcomes reported even in cases with metastases. We herein report an additional case of EWSR1-PATZ1 fusion-related round cell sarcoma in the face of a 5-year-old boy with unusual histologic features of pale zones, rosette/gland-like structures and expression of epithelial markers. Fluorescent in-situ hybridization study (FISH) using EWSR1 breakapart probes was negative and molecular study with RNA sequencing was required to confirm the diagnosis. These findings highlight the diagnostic challenge and potential pitfall of FISH study in EWSR1-PATZ1 sarcoma. Further studies are required to increase the understanding of their behavior, morphologic spectrum and molecular features that will help devise new treatment strategies to these rare tumours. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12105-021-01285-w.
- Published
- 2021
27. Single-cycle infrared waveform control
- Author
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Steinleitner, Philipp, primary, Nagl, Nathalie, additional, Kowalczyk, Maciej, additional, Zhang, Jinwei, additional, Pervak, Vladimir, additional, Hofer, Christina, additional, Hudzikowski, Arkadiusz, additional, Sotor, Jarosław, additional, Weigel, Alexander, additional, Krausz, Ferenc, additional, and Mak, Ka Fai, additional
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- 2022
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28. Aberrant cholesterol metabolic signaling impairs antitumor immunosurveillance through natural killer T cell dysfunction in obese liver
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Tang, Wenshu, primary, Zhou, Jingying, additional, Yang, Weiqin, additional, Feng, Yu, additional, Wu, Haoran, additional, Mok, Myth T. S., additional, Zhang, Lingyun, additional, Liang, Zhixian, additional, Liu, Xiaoyu, additional, Xiong, Zhewen, additional, Zeng, Xuezhen, additional, Wang, Jing, additional, Lu, Jiahuan, additional, Li, Jingqing, additional, Sun, Hanyong, additional, Tian, Xiaoyu, additional, Yeung, Philip Chun, additional, Hou, Yong, additional, Lee, Heung Man, additional, Lam, Candice C. H., additional, Leung, Howard H. W., additional, Chan, Anthony W. H., additional, To, Ka Fai, additional, Wong, John, additional, Lai, Paul B. S., additional, Ng, Kelvin K. C., additional, Wong, Simon K. H., additional, Wong, Vincent W. S., additional, Kong, Alice P. S., additional, Sung, Joseph J. Y., additional, and Cheng, Alfred S. L., additional
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- 2022
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29. Dual-comb thin-disk oscillator
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Fritsch, Kilian, primary, Hofer, Tobias, additional, Brons, Jonathan, additional, Iandulskii, Maksim, additional, Mak, Ka Fai, additional, Chen, Zaijun, additional, Picqué, Nathalie, additional, and Pronin, Oleg, additional
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- 2022
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30. Hypomanic symptoms in early pregnancy: prevalence and associated factors
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Catherine So-kum Tang, Chui Yi Chan, Chin Peng Lee, YW Koh, Antoinette M. Lee, Siu Keung Lam, Kwok Yin Leung, and Ka Fai Chung
- Subjects
Postpartum depression ,medicine.medical_specialty ,business.industry ,Obstetrics ,Confounding ,Obstetrics and Gynecology ,medicine.disease ,Mental health ,030227 psychiatry ,03 medical and health sciences ,Psychiatry and Mental health ,0302 clinical medicine ,Hypomania ,Medicine ,Antenatal depression ,Anxiety ,medicine.symptom ,business ,030217 neurology & neurosurgery ,Depression (differential diagnoses) ,Postpartum period - Abstract
Given that the perinatal period is a time of increased risk for pregnant women to manifest mental health problems, the identification of antenatal hypomanic symptoms is particularly important. However, data on antenatal hypomanic symptoms is lacking. The present study was aimed at filling this research gap by investigating the prevalence of hypomanic symptoms, including the "active-elated" and "irritable/risk-taking" sides of hypomanic symptoms at the first trimester, and examining their associations with anxiety and depressive symptoms at the following time points: the first trimester, the second trimester, and up to 6-week postpartum. A prospective longitudinal design with a quantitative approach was adopted. A consecutive sample of 229 pregnant Chinese women in Hong Kong was assessed. Hypomanic symptoms were assessed with the Hypomania Checklist-32 (HCL-32). Of the sample, 43.6% had elevated levels of hypomanic symptoms in the first trimester. Multiple regression analysis showed that after adjusting for potential confounding factors, irritable/risk-taking symptoms were independently associated with higher anxiety symptoms in the first and second trimesters and in the 6-week postpartum period. Primary healthcare practitioners should be made aware of antenatal hypomanic symptoms in pregnant women to facilitate early identification and intervention for anxiety and depression to improve the well-being of both mothers and infants.
- Published
- 2020
31. Combined SOX10 GATA3 is most sensitive in detecting primary and metastatic breast cancers: a comparative study of breast markers in multiple tumors
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Siu-Ki Chan, Ivan K. Poon, Ronald C. K. Chan, Ka Fai To, Shirley K. Jamidi, Yan Shao, Fiona K Tam, Joshua Li, Julia Y. Tsang, Sai-Yin Cheung, Chaiwat Aphivatanasiri, Ka-Ho Shea, Gary Tse, and Joanna Tong
- Subjects
0301 basic medicine ,Cancer Research ,Breast Neoplasms ,GATA3 Transcription Factor ,03 medical and health sciences ,0302 clinical medicine ,Breast cancer ,Mammaglobin ,Biomarkers, Tumor ,medicine ,Carcinoma ,Humans ,Breast ,skin and connective tissue diseases ,Lung cancer ,biology ,Salivary gland ,SOXE Transcription Factors ,business.industry ,Melanoma ,Mammaglobin A ,GATA3 ,medicine.disease ,030104 developmental biology ,medicine.anatomical_structure ,Oncology ,030220 oncology & carcinogenesis ,embryonic structures ,biology.protein ,Cancer research ,Immunohistochemistry ,Female ,business - Abstract
For invasive breast cancer (IBC), high SOX10 expression was reported particularly in TNBC. This raised the possibility that SOX10 may complement other breast markers for determining cancers of breast origin. Here, we compared the expression of SOX10 with other breast markers (GATA3, mammaglobin and GCDFP15) and their combined expression in a large cohort of IBC together with nodal metastases. We have also evaluated the expression of GATA3 and SOX10 in a wide spectrum of non-breast carcinomas to assess their value as breast specific markers. Compared with other markers, SOX10 showed lower overall sensitivity (6.5%), but higher sensitivity in TNBC (31.4%) than other breast markers including GATA3 (29.7% for TNBC). Its expression demonstrated the highest concordance between the paired IBC and nodal metastases (96.4%, κ = 0.663) among all the breast markers. More importantly, SOX10 identified many GATA3-negative TNBC, thus the SOX10/GATA3 combination was the most sensitive marker combination for IBC (86.6%). For non-breast carcinoma, a high SOX10/GATA3 expression rate was found in melanoma (77.9%, predominately expressed SOX10), urothelial carcinoma (82.0%, predominately expressed GATA3) and salivary gland tumors (69.4%). Other carcinomas, including cancers from lungs, showed very low expression for the marker combination. The data suggested that SOX10/GATA3 combination can be used for differentiating metastases of breast and multiple non-breast origins. However, the differentiation with melanoma and urothelial tumors required more careful histologic examination, thorough clinical information and additional site-specific IHC markers. For salivary gland tumors, the overlapping tumor types with IBC renders the differentiation difficult.
- Published
- 2020
32. Optimality Analysis of a Class of Semi-infinite Programming Problems
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Lin Chen, Ka Fai Cedric Yiu, Fei Chen, and Zhi Guo Feng
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Sequence ,Control and Optimization ,Optimization problem ,Series (mathematics) ,Applied Mathematics ,Theory of computation ,Fixed-point theorem ,Applied mathematics ,Monotonic function ,Limit (mathematics) ,Management Science and Operations Research ,Semi-infinite programming ,Mathematics - Abstract
In this paper, we consider a class of semi-infinite programming problems with a parameter. As the parameter increases, we prove that the optimal values decrease monotonically. Moreover, the limit of the sequence of optimal values exists as the parameter tends to infinity. In finding the limit, we decompose the original optimization problem into a series of subproblems. By calculating the maximum optimal values to the subproblems and applying a fixed-point theorem, we prove that the obtained maximum value is exactly the limit of the sequence of optimal values under certain conditions. As a result, the limit can be obtained efficiently by solving a series of simplified subproblems. Numerical examples are provided to verify the limit obtained by the proposed method.
- Published
- 2020
33. Correction to: Nicotinamide riboside as a neuroprotective therapy for glaucoma: study protocol for a randomized, double-blind, placebo-control trial
- Author
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Christopher Kai Shun Leung, Seraph Tianmin Ren, Poemen Pui Man Chan, Kelvin Ho Nam Wan, Aziz Ka Wai Kam, Gilda Wing Ki Lai, Vivian Sheung Man Chiu, Match Wai Lun Ko, Cedric Ka Fai Yiu, and Marco Chak Yan Yu
- Subjects
Medicine (General) ,R5-920 ,Medicine (miscellaneous) ,Pharmacology (medical) - Published
- 2022
34. Nicotinamide riboside as a neuroprotective therapy for glaucoma: study protocol for a randomized, double-blind, placebo-control trial
- Author
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Cedric Ka Fai Yiu, Match W L Ko, Aziz Kam, Kelvin H Wan, Poemen P. Chan, Vivian Chiu, Seraph Tianmin Ren, Marco Yu, Gilda Lai, and Christopher Kai-Shun Leung
- Subjects
Niacinamide ,Retinal Ganglion Cells ,Medicine (General) ,genetic structures ,Glaucoma ,Medicine (miscellaneous) ,Pyridinium Compounds ,Pharmacology ,Placebo ,Neuroprotection ,Double blind ,Study Protocol ,chemistry.chemical_compound ,R5-920 ,Nerve Fibers ,Text mining ,Humans ,Multicenter Studies as Topic ,Medicine ,Pharmacology (medical) ,Randomized Controlled Trials as Topic ,Progressive retinal nerve fiber layer thinning ,Protocol (science) ,Optical coherence tomography ,business.industry ,medicine.disease ,Visual field ,eye diseases ,Nicotinamide riboside ,Retinal nerve fiber layer ,chemistry ,sense organs ,Visual Fields ,business ,Glaucoma, Open-Angle - Abstract
Background Whereas lowering the intraocular pressure (IOP) can slow optic nerve degeneration in glaucoma, many patients with glaucoma continue to develop progressive loss in vision despite a significant reduction in IOP. No treatment has been shown to be effective for neuroprotection in glaucoma. We set out to conduct a randomized controlled trial to investigate whether nicotinamide riboside (NR), a nicotinamide adenine dinucleotide precursor, is effective to slow optic nerve degeneration in patients with primary open-angle glaucoma (POAG). We hypothesize that patients treated with NR have a slower rate of progressive retinal nerve fiber layer (RNFL) thinning compared with those treated with placebo. Methods This is a randomized, double-blind, placebo-controlled, parallel-group, multi-center study including 125 patients with POAG. Patients will be randomized to receive 300 mg NR or placebo for 24 months. Clinical examination, optical coherence tomography imaging of the RNFL, and visual field (VF) test will be performed at the baseline, 1 month, 4 months, and then at 2-month intervals until 24 months. The primary outcome measure is the rate of RNFL thinning measured over 24 months. The secondary outcome measures include (1) time to VF progression, (2) time to progressive RNFL/ganglion cell inner plexiform layer (GCIPL) thinning, and (3) the rate of change of VF sensitivity over 24 months (to investigate neuroprotection) and 1 month (to investigate neuroenhancement). The rates of RNFL thinning and VF sensitivity decline between treatment groups will be compared with linear mixed modeling. Survival analysis will be performed to compare the differences in time from baseline to VF progression and time from baseline to progressive RNFL/GCIPL thinning between treatment groups using Cox proportional hazards models. Discussion Outcome measures in glaucoma neuroprotection trials have been centered on the detection of VF progression, which may take years to develop and confirm. In addition to addressing whether NR has a neuroprotective/neuroenhancement effect in glaucoma patients, this study will demonstrate the feasibility of studying neuroprotection in a relatively short trial period (24 months) by comparing the rates of progressive RNFL thinning, a more reproducible and objective outcome measure compared with VF endpoints, between treatment groups. Trial registration Chinese Clinical Trial Registry 1900021998
- Published
- 2022
35. In vitro assessment of intra-operative and post-operative environment in reducing bladder cancer recurrence
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Ryan Tsz-Hei Tse, Hongda Zhao, Christine Yim-Ping Wong, Angel Wing-Yan Kong, Ronald Cheong-Kin Chan, Ka-Fai To, Chi-Fai Ng, and Jeremy Yuen-Chun Teoh
- Subjects
Cancer microenvironment ,Multidisciplinary ,Cell Survival ,Mitomycin ,Science ,Bladder cancer ,Apoptosis ,Hyperthermia, Induced ,Urological cancer ,In Vitro Techniques ,Combined Modality Therapy ,Article ,Urogenital diseases ,Urinary Bladder Neoplasms ,Cell Line, Tumor ,Humans ,Medicine ,Postoperative Period ,Neoplasm Recurrence, Local ,Cancer - Abstract
Urinary bladder cancer is a common cancer worldwide. Currently, the modality of treating and monitoring bladder cancer is wide. Nonetheless, the high recurrence rate of non-muscle-invasive bladder cancer after surgical resection is still unsatisfactory. Hereby, our study demonstrated whether the intra-operative and post-operative environments will affect bladder cancer recurrence utilizing in vitro cell line model. Bladder cancer cell lines were submerged in four different irrigating fluids for assessing their tumorigenic properties. Our results showed that sterile water performed the best in terms of the magnitude of cytotoxicity to cell lines. Besides, we also investigated cytotoxic effects of the four irrigating agents as well as mitomycin C (MMC) in normothermic and hyperthermic conditions. We observed that sterile water and MMC had an increased cytotoxic effect to bladder cancer cell lines in hyperthermic conditions. Altogether, our results could be translated into clinical practice in the future by manipulating the intra-operative and post-operative conditions in order to lower the chance of residual cancer cells reimplant onto the bladder, which in turns, reducing the recurrence rate of bladder cancers.
- Published
- 2022
36. CircRTN4 promotes pancreatic cancer progression through a novel CircRNA-miRNA-lncRNA pathway and stabilizing epithelial-mesenchymal transition protein
- Author
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Wong, Chi Hin, Lou, Ut Kei, Fung, Frederic Khe-Cheong, Tong, Joanna H. M., Zhang, Chang-hua, To, Ka-Fai, Chan, Stephen Lam, and Chen, Yangchao
- Subjects
Adult ,Male ,Cancer Research ,Epithelial-Mesenchymal Transition ,endocrine system diseases ,HOTTIP ,Nogo Proteins ,Pancreatic ductal adenocarcinoma ,Mice ,Cell Line, Tumor ,Biomarkers, Tumor ,Animals ,Humans ,circRTN4 ,RC254-282 ,Aged ,Neoplasm Staging ,Research ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RNA, Circular ,Middle Aged ,digestive system diseases ,Gene Expression Regulation, Neoplastic ,Pancreatic Neoplasms ,Disease Models, Animal ,MicroRNAs ,Oncology ,Molecular Medicine ,MiRNAs ,Female ,RNA Interference ,RNA, Long Noncoding ,Neoplasm Grading - Abstract
Background Circular RNAs (circRNAs) play important roles in many biological processes. However, the detailed mechanism underlying the critical roles of circRNAs in cancer remains largely unexplored. We aim to explore the molecular mechanisms of circRTN4 with critical roles in pancreatic ductal adenocarcinoma (PDAC). Methods CircRTN4 expression level was examined in PDAC primary tumors. The oncogenic roles of circRTN4 in PDAC tumor growth and metastasis were studied in mouse tumor models. Bioinformatics analysis, luciferase assay and miRNA pulldown assay were performed to study the novel circRTN4-miRNA-lncRNA pathway. To identify circRTN4-interacting proteins, we performed circRNA-pulldown and mass spectrometry in PDAC cells. Protein stability assay and 3-Dimensional structure modeling were performed to reveal the role of circRTN4 in stabilizing RAB11FIP1. Results CircRTN4 was significantly upregulated in primary tumors from PDAC patients. In vitro and in vivo functional studies revealed that circRTN4 promoted PDAC tumor growth and liver metastasis. Mechanistically, circRTN4 interacted with tumor suppressor miR-497-5p in PDAC cells. CircRTN4 knockdown upregulated miR-497-5p to inhibit the oncogenic lncRNA HOTTIP expression. Furthermore, we identified critical circRTN4-intercting proteins by circRNA-pulldown in PDAC cells. CircRTN4 interacted with important epithelial-mesenchymal transition (EMT)- driver RAB11FIP1 to block its ubiquitination site. We found that circRTN4 knockdown promoted the degradation of RAB11FIP1 by increasing its ubiquitination. Also, circRTN4 knockdown inhibited the expression of RAB11FIP1-regulating EMT-markers Slug, Snai1, Twist, Zeb1 and N-cadherin in PDAC. Conclusion The upregulated circRTN4 promotes tumor growth and liver metastasis in PDAC through the novel circRTN4-miR-497-5p-HOTTIP pathway. Also, circRTN4 stabilizes RAB11FIP1 to contribute EMT. Graphical abstract
- Published
- 2022
37. Correction to: Nicotinamide riboside as a neuroprotective therapy for glaucoma: study protocol for a randomized, double-blind, placebo-control trial
- Author
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Leung, Christopher Kai Shun, primary, Ren, Seraph Tianmin, additional, Chan, Poemen Pui Man, additional, Wan, Kelvin Ho Nam, additional, Kam, Aziz Ka Wai, additional, Lai, Gilda Wing Ki, additional, Chiu, Vivian Sheung Man, additional, Ko, Match Wai Lun, additional, Yiu, Cedric Ka Fai, additional, and Yu, Marco Chak Yan, additional
- Published
- 2022
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38. Expanding the clinical and molecular spectrum of pituitary blastoma
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Liu, Anthony Pak-Yin, primary, Li, Kay Ka-Wai, additional, Chow, Chit, additional, Chan, Shing, additional, Leung, Alex Wing-Kwan, additional, Shing, Matthew Ming-Kong, additional, To, Ka-Fai, additional, Chan, Danny Tat-Ming, additional, Chan, Godfrey Chi-Fung, additional, and Ng, Ho-Keung, additional
- Published
- 2022
- Full Text
- View/download PDF
39. Nicotinamide riboside as a neuroprotective therapy for glaucoma: study protocol for a randomized, double-blind, placebo-control trial
- Author
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Leung, Christopher Kai Shun, primary, Ren, Seraph Tianmin, additional, Chan, Poemen Pui Man, additional, Wan, Kelvin Ho Nam, additional, Kam, Aziz Ka Wai, additional, Lai, Gilda Wing Ki, additional, Chiu, Vivian Sheung Man, additional, Ko, Match Wai Lun, additional, Yiu, Cedric Ka Fai, additional, and Yu, Marco Chak Yan, additional
- Published
- 2022
- Full Text
- View/download PDF
40. In vitro assessment of intra-operative and post-operative environment in reducing bladder cancer recurrence
- Author
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Tse, Ryan Tsz-Hei, primary, Zhao, Hongda, additional, Wong, Christine Yim-Ping, additional, Kong, Angel Wing-Yan, additional, Chan, Ronald Cheong-Kin, additional, To, Ka-Fai, additional, Ng, Chi-Fai, additional, and Teoh, Jeremy Yuen-Chun, additional
- Published
- 2022
- Full Text
- View/download PDF
41. STK3 promotes gastric carcinogenesis by activating Ras-MAPK mediated cell cycle progression and serves as an independent prognostic biomarker
- Author
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Chen, Bonan, primary, Chan, Wai Nok, additional, Mui, Chun Wai, additional, Liu, Xiaoli, additional, Zhang, Jinglin, additional, Wang, Yifei, additional, Cheung, Alvin H. K., additional, Chan, Aden K. Y., additional, Chan, Ronald C. K., additional, Leung, Kam Tong, additional, Dong, Yujuan, additional, Pan, Yi, additional, Ke, Huixing, additional, Liang, Li, additional, Zhou, Zhaocai, additional, Wong, Chi Chun, additional, Wu, William K. K., additional, Cheng, Alfred S. L., additional, Yu, Jun, additional, Lo, Kwok Wai, additional, To, Ka Fai, additional, and Kang, Wei, additional
- Published
- 2021
- Full Text
- View/download PDF
42. The lipid-lowering effect of once-daily soya drink fortified with phytosterols in normocholesterolaemic Chinese: a double-blind randomized controlled trial
- Author
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Man Fung Tsoi, Chor-Wing Sing, Yu-Chun Cheng, Vincent Ka-Fai Cheng, Bernard M.Y. Cheung, Ching-Lung Cheung, Yin-Pan Chau, and Grace Koon-Yee Lee
- Subjects
Adult ,Male ,0301 basic medicine ,China ,medicine.medical_specialty ,Asia ,Hypercholesterolemia ,Population ,Medicine (miscellaneous) ,030209 endocrinology & metabolism ,Placebo ,law.invention ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Double-Blind Method ,Randomized controlled trial ,law ,Internal medicine ,medicine ,Animals ,Humans ,education ,Adverse effect ,education.field_of_study ,030109 nutrition & dietetics ,Nutrition and Dietetics ,business.industry ,Cholesterol ,Phytosterols ,medicine.disease ,Lipids ,Blood pressure ,chemistry ,Intestinal cholesterol absorption ,Cattle ,Female ,business ,Dyslipidemia - Abstract
Phytosterols reduce intestinal cholesterol absorption and help to lower LDL-cholesterol. Many Chinese adults are lactose-intolerant and cannot tolerate bovine milk enriched with phytosterol. Soya-milk is a common beverage in Asia and it has beneficial effects on general health. We therefore conducted a randomized double-blind controlled trial to assess the effectiveness of a phytosterols-enriched soya drink in lowering serum LDL-cholesterol level (primary outcome) and other cardiovascular parameters (secondary outcomes). One hundred and fifty-nine normocholesterolaemic participants (85 men and 74 women; aged 19–79) were randomized to daily intake of one serving of phytosterols-enriched soya drink (N = 82), equivalent to 2 g of phytosterol per day, or a matched soya drink without phytosterols (N = 77) for 3 weeks. Adverse events, withdrawal and compliance were documented. Among the treatment group (N = 82), phytosterols-enriched soya drink significantly decreased LDL-cholesterol by 5.96% (SE 1.48, 95% CI − 8.91%, − 3.00%) with a median of 6.74% compared with baseline, resulting in a significant reduction of 4.70% (95% CI − 8.89%, − 0.51%; p = 0.028) with a median of 5.20% compared with placebo (N = 77). In contrast, there were no significant changes in other lipid parameters, blood glucose, blood pressure, body weight or waist circumference. Remarkably, 95% of the participants randomized to the fortified drink reported no adverse events at all. Daily consumption of a phytosterols-enriched soya drink may be a simple and cost-neutral means of lowering LDL-cholesterol in individuals in China, with massive population and rising incidence of coronary heart disease (ClinicalTrials.gov identifier: NCT02881658; date of registration: 14 Aug 2016).
- Published
- 2019
43. Fuzzy System with Customized Subset Selection for Financial Trading Applications
- Author
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Wing Man Tang, Ka Fai Cedric Yiu, Kit Yan Chan, and Heung Wong
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Matching (statistics) ,Computer science ,business.industry ,Big data ,Dashboard (business) ,Computational intelligence ,02 engineering and technology ,Fuzzy control system ,computer.software_genre ,Theoretical Computer Science ,Computational Theory and Mathematics ,Artificial Intelligence ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Trading strategy ,Data mining ,business ,Selection algorithm ,computer ,Software ,Selection (genetic algorithm) - Abstract
In the financial industry, identifying useful information from big data becomes a key research topic. Since the vast number of technical indicators can be captured nowadays, the indicator selection can be used to support investment decision for different financial products concurrently; however, this process is still required experience from investors. In this article, we propose a novel recommendation system which is incorporated with technical indicators. The method of fuzzy subset selection is used to feature relevant indicators which have more impact to the variation in the transaction history. The proposed method enables automatic customization of indicators for different financial products in different markets. In particular, the least absolute distance fuzzy regression with non-symmetric lower and upper bounds is proposed to avoid extreme values in dominating the model. Furthermore, to reduce computational complexity in the subset selection, the selection algorithm operates in the frequency domain for identifying and matching key patterns and peaks in transacted volumes with the technical indicators. This method performs very effective although the number of factors is much greater than the sample size. The proposed method can benefit participants in the finance markets to customize their own trading dashboard as well as set up their own trading strategies.
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- 2019
44. Analysis of Price Differences Between A and H Shares
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Y. Bai, W. M. Tang, and Ka Fai Cedric Yiu
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Mainland China ,050208 finance ,Price difference ,Financial economics ,05 social sciences ,Convergence (economics) ,Sample (statistics) ,A share ,Stock exchange ,Industry sector ,0502 economics and business ,Economics ,050207 economics ,Finance - Abstract
The price difference between A share trading in the Mainland and H share trading in Hong Kong of the same company has been prevailing since inception. Studying the differences could be useful in understanding dissimilarity between the two markets. This paper is devoted to analyze certain company specific and market factors that may influence premiums between A and H shares. An appropriate factor model is built based on a sample from 63 listed companies in both markets from January 2014 to June 2017. Our factors are useful to explain premium variations. In addition to typical market and company specific factors, it is found premium levels are significantly related to the industry sector in general. Meanwhile, it is observed that premiums of many shares are becoming narrower in recent years, which might pave the way to convergence after closer links between the Mainland and Hong Kong stock exchanges.
- Published
- 2019
45. Robust broadband beamformer design for noise reduction and dereverberation
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Ka Fai Cedric Yiu, Hai Huyen Dam, Sven Nordholm, and Lara Nahma
- Subjects
Reverberation ,Microphone array ,Microphone ,Computer science ,Applied Mathematics ,Noise reduction ,020206 networking & telecommunications ,02 engineering and technology ,Computer Science Applications ,Amplitude ,Artificial Intelligence ,Hardware and Architecture ,Robustness (computer science) ,Signal Processing ,Broadband ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,020201 artificial intelligence & image processing ,Software ,Impulse response ,Information Systems - Abstract
In this paper, we investigate robust design methods for broadband beamformers in reverberant environments. In the design formulation room reverberation as well as robustness to amplitude and phase mismatches in the microphones have been included. Particularly, the direct path and the reflections are separated in the design such that there is a penalty on the reflective part. This approach is different from the commonly studied problem of dereverberation of a single point source as the investigated design is made over a region in space. A single point derverberation is not a very practical approach due to a high sensitivity to position changes. Thus in order to obtain more practical microphone array designs, we study methods that optimize performance over areas in space. The design problem has been formulated in four different ways; (i) using direct path only representing a traditional beamformer design method, (ii) using a robust design method which considers robustness against the microphone characteristics (gain and phase) by optimizing the mean performance, (iii) by including room impulse response in the design and finally, (iv) using both robustness and room impulse response in the design. Simulation results show that robust direct path based beamformer can achieve approximately the same performance as including room response in the design in many reverberation environments. The proposed method provides robustness over larger variations in the reverberation environment. This means that the robust direct path based method which is based on mean variations in gain and phase can be used in low- to medium ($$T_{60}$$ = 100–300 ms) reverberant environments with good result.
- Published
- 2019
46. A parallel beamforming system with real-time implementation
- Author
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Ka Fai Cedric Yiu
- Subjects
Beamforming ,Hardware architecture ,Microphone array ,Computer Networks and Communications ,Computer science ,Noise reduction ,020207 software engineering ,02 engineering and technology ,Filter (signal processing) ,Speaker recognition ,Signal ,Hardware and Architecture ,Distortion ,Frequency domain ,0202 electrical engineering, electronic engineering, information engineering ,Media Technology ,Electronic engineering ,Software - Abstract
For voice control applications, it is common to employ a microphone array to enhance received signals via beamforming techniques. In designing beamformers, different criteria will lead to different signal performance. It is known that speech recognition accuracy relies heavily on the trade-off between signal distortion and noise reduction. In this paper, we propose a novel beamformer structure which can give a continuous profile in signal distortion and noise reduction. The proposed structure combines two existing optimal beamformers to form the final filter. Moreover, since both optimal beamforming filters can be executed in parallel, a method is proposed to implement the noise reduction algorithm in the frequency domain. By studying the accuracy and efficiency of different modules, a hybrid fixed-floating point arithmetic is proposed within an FPGA hardware architecture to form an embedded system for industrial applications.
- Published
- 2019
47. Jump detection in financial time series using machine learning algorithms
- Author
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Zi kai Wei, Ka Fai Cedric Yiu, Jay F.K. Au Yeung, Kit Yan Chan, and Henry Y. K. Lau
- Subjects
0209 industrial biotechnology ,Computer science ,02 engineering and technology ,Machine learning ,computer.software_genre ,Theoretical Computer Science ,020901 industrial engineering & automation ,0202 electrical engineering, electronic engineering, information engineering ,Time series ,Finance ,Artificial neural network ,business.industry ,Financial market ,Trend following ,Statistical classification ,Recurrent neural network ,020201 artificial intelligence & image processing ,Stock market ,Anomaly detection ,Step detection ,Geometry and Topology ,Tail risk ,Artificial intelligence ,Volatility (finance) ,business ,Put option ,Algorithm ,computer ,Software - Abstract
In this paper, we develop a new Hybrid method based on machine learning algorithms for jump detection in financial time series. Jump is an important behavior in financial time series, since it implies a change in volatility. Ones can buy the volatility instrument if ones expect the volatility will bloom up in the future. A jump detection model attempts to detect short-term market instability, since it could be jumping up or down, instead of a directional prediction. The directional prediction can be considered as a momentum or trend following, which is not the focus of this paper. A jump detection model is commonly applied in a systematic fast-moving strategy, which reallocates the assets automatically. Also, a systematic opening position protection strategy can be driven by a jump detection model. For example, for a tail risk protection strategy, a pair of long call and put option order could be placed in the same time, in order to protect the open position given a huge change in volatility. One of the key differentiations of the proposed model with the classical methods of time-series anomaly detection is that, jump threshold parameters are not required to be predefined in our proposed model. Also the model is a combination of a Long short-term memory (LSTM) neural network model and a machine learning pattern recognition model. The LSTM model is applied for time series prediction, which predicts the next data point. The historical prediction errors sequence can be used as the information source or input of the jump detection model/module. The machine learning pattern recognition model is applied for jump detection. The combined model attempts to determine whether the current data point is a jump or not. LSTM neural network is a type of Recurrent Neural Networks (RNNs). LSTM records not only the recent market, but also the historical status. A stacked RNN is trained on a dataset which is mixed with normal and anomalous data. We compare the performance of the proposed Hybrid jump detection model and different pattern classification algorithms, such as k-nearest neighbors algorithm identifier, Hampel identifier, and Lee Mykland test. The model is trained and tested using real financial market data, including 11 global stock market in both developed and emerging markets in US, China, Hong Kong, Taiwan, Japan, UK, German, and Israel. The experiment result shows that the proposed Hybrid jump detection model is effective to detect jumps in terms of accuracy, comparing to the other classical jump detection methods.
- Published
- 2019
48. Whole-genome profiling of nasopharyngeal carcinoma reveals viral-host co-operation in inflammatory NF-κB activation and immune escape
- Author
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Bruce, Jeff P., primary, To, Ka-Fai, additional, Lui, Vivian W. Y., additional, Chung, Grace T. Y., additional, Chan, Yuk-Yu, additional, Tsang, Chi Man, additional, Yip, Kevin Y., additional, Ma, Brigette B. Y., additional, Woo, John K. S., additional, Hui, Edwin P., additional, Mak, Michael K. F., additional, Lee, Sau-Dan, additional, Chow, Chit, additional, Velapasamy, Sharmila, additional, Or, Yvonne Y. Y., additional, Siu, Pui Kei, additional, El Ghamrasni, Samah, additional, Prokopec, Stephenie, additional, Wu, Man, additional, Kwan, Johnny S. H., additional, Liu, Yuchen, additional, Chan, Jason Y. K., additional, van Hasselt, C. Andrew, additional, Young, Lawrence S., additional, Dawson, Christopher W., additional, Paterson, Ian C., additional, Yap, Lee-Fah, additional, Tsao, Sai-Wah, additional, Liu, Fei-Fei, additional, Chan, Anthony T. C., additional, Pugh, Trevor J., additional, and Lo, Kwok-Wai, additional
- Published
- 2021
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49. Nasopharyngeal carcinoma: an evolving paradigm
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Wong, Kenneth C. W., primary, Hui, Edwin P., additional, Lo, Kwok-Wai, additional, Lam, Wai Kei Jacky, additional, Johnson, David, additional, Li, Lili, additional, Tao, Qian, additional, Chan, Kwan Chee Allen, additional, To, Ka-Fai, additional, King, Ann D., additional, Ma, Brigette B. Y., additional, and Chan, Anthony T. C., additional
- Published
- 2021
- Full Text
- View/download PDF
50. Comparison of Performance of Fabrics made of Torque-free and Conventional Ring Spun Yarn with Different Varieties of Cotton Fibres
- Author
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Chu, Ping-yee, primary, Choi, Ka-fai, additional, Chuang, Yu-chun, additional, and Kan, Chi-wai, additional
- Published
- 2021
- Full Text
- View/download PDF
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