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Leung HS, Chan LY, Law CH, Li MW, Lam HM. Twenty years of mining salt tolerance genes in soybean. Mol Breed 2023; 43:45. [PMID: 37313223 PMCID: PMC10248715 DOI: 10.1007/s11032-023-01383-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 04/12/2023] [Indexed: 06/15/2023]
Abstract
Current combined challenges of rising food demand, climate change and farmland degradation exert enormous pressure on agricultural production. Worldwide soil salinization, in particular, necessitates the development of salt-tolerant crops. Soybean, being a globally important produce, has its genetic resources increasingly examined to facilitate crop improvement based on functional genomics. In response to the multifaceted physiological challenge that salt stress imposes, soybean has evolved an array of defences against salinity. These include maintaining cell homeostasis by ion transportation, osmoregulation, and restoring oxidative balance. Other adaptations include cell wall alterations, transcriptomic reprogramming, and efficient signal transduction for detecting and responding to salt stress. Here, we reviewed functionally verified genes that underly different salt tolerance mechanisms employed by soybean in the past two decades, and discussed the strategy in selecting salt tolerance genes for crop improvement. Future studies could adopt an integrated multi-omic approach in characterizing soybean salt tolerance adaptations and put our existing knowledge into practice via omic-assisted breeding and gene editing. This review serves as a guide and inspiration for crop developers in enhancing soybean tolerance against abiotic stresses, thereby fulfilling the role of science in solving real-life problems. Supplementary Information The online version contains supplementary material available at 10.1007/s11032-023-01383-3.
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Affiliation(s)
- Hoi-Sze Leung
- Center for Soybean Research of the State Key Laboratory of Agrobiotechnology, and School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People’s Republic of China
| | - Long-Yiu Chan
- Center for Soybean Research of the State Key Laboratory of Agrobiotechnology, and School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People’s Republic of China
| | - Cheuk-Hin Law
- Center for Soybean Research of the State Key Laboratory of Agrobiotechnology, and School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People’s Republic of China
| | - Man-Wah Li
- Center for Soybean Research of the State Key Laboratory of Agrobiotechnology, and School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People’s Republic of China
| | - Hon-Ming Lam
- Center for Soybean Research of the State Key Laboratory of Agrobiotechnology, and School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People’s Republic of China
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, 518000 People’s Republic of China
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Gupta S, Brar G, Zheng K, Hakim S, Teshima CW, May GR, Law CH, Hallet J, Mosko JD. A156 OUTCOMES FOLLOWING ENDOSCOPIC RESECTION OF GASTRIC NEUROENDOCRINE TUMOURS FROM A TERTIARY-CARE ACADEMIC CENTRE. J Can Assoc Gastroenterol 2023. [PMCID: PMC9991168 DOI: 10.1093/jcag/gwac036.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Background Gastric neuroendocrine tumours (G-NET) are rare cancers derived from neuroendocrine cells of the stomach. A steady increase in the incidence of these tumours has been observed. Current treatment and surveillance strategies are guided by various tumour characteristics including size, grade, and depth of invasion. There exists conflicting evidence, however, on the rates of recurrence from positive resection margins following primary endoscopic resection. Thus, it remains uncertain whether complete endoscopic resection (R0) of these indolent tumours is clinically significant and whether follow-up endoscopic or surgical intervention is justified. Purpose Our aim is to characterize current management patterns and clinical outcomes in patients undergoing endoscopic resection of G-NETs. Method We conducted a retrospective, single-centre cohort study at The Centre for Advanced Therapeutic Endoscopy and Endoscopic Oncology at St. Michael’s Hospital, Toronto, Ontario. Consecutive patients over the age of 18 who underwent endoscopic resection of histologically proven G-NETs between 2011 and 2020 were included. Data on patient, endoscopic, and tumour characteristics were collected through electronic chart review. Descriptive statistics were conducted for data analysis. Result(s) A total of 155 foregut neuroendocrine tumours were endoscopically resected during the study period, of which 108 were identified as G-NETs. 95.3% were classified as Type I. Mean tumour size was 8.93 ± 5.27 mm. Cap-assisted EMR was performed most frequently (n=51), followed by conventional EMR (n=35). ESD was performed in eight cases. Seven intra-procedural perforations occurred, of which all were closed endoscopically. One patient experienced post-procedural perforation requiring ICU and surgery. Positive resection margins (R1) were found in 25% of cases (n=27), of which 78% were assessed at surveillance endoscopy 1 (SE1). Six patients with R1 margins were referred for surgical evaluation and four were lost to follow-up. 78% of all resected G-NETs were followed at SE1 with a median interval of 196 days (range, 23 to 3373). SE1 recurrence rate at the primary resection site was 14% (n=12), of which two were from routine scar biopsies in the absence of endoscopically identifiable recurrence. All visible recurrences at these sites (n=10) were managed with repeat endoscopic resection. Patient and tumour characteristics in the evaluation of G-NET recurrence are presented in Table I. Image ![]()
Conclusion(s) G-NET recurrence occurs in less than 15% of patients at surveillance endoscopy following endoscopic resection in spite of a predictably higher R1 resection rate. Patient, endoscopic, and tumour factors including method of resection and margin status do not appear to impact the development of early recurrence. Given the indolent nature of these tumours, patients with positive resection margins can be followed conservatively. Further investigation is warranted to determine the optimal duration and surveillance strategy for these patients. Please acknowledge all funding agencies by checking the applicable boxes below None Disclosure of Interest None Declared
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Affiliation(s)
- S Gupta
- Medicine, University of Toronto
| | - G Brar
- Medicine, University of Toronto
| | - K Zheng
- Medicine, University of Toronto
| | - S Hakim
- Laboratory Medicine and Pathobiology, St. Joseph’s Health Centre
| | - C W Teshima
- The Center for Advanced Therapeutic Endoscopy and Endoscopic Oncology, St. Michael’s Hospital
| | - G R May
- The Center for Advanced Therapeutic Endoscopy and Endoscopic Oncology, St. Michael’s Hospital
| | - C H Law
- Surgery, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - J Hallet
- Surgery, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - J D Mosko
- The Center for Advanced Therapeutic Endoscopy and Endoscopic Oncology, St. Michael’s Hospital
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Gupta S, Brar G, Zheng K, Hakim S, Teshima CW, May GR, Law CH, Hallet J, Mosko JD. A155 OUTCOMES FOLLOWING ENDOSCOPIC RESECTION OF DUODENAL NEUROENDOCRINE TUMOURS FROM A TERTIARY-CARE ACADEMIC CENTRE. J Can Assoc Gastroenterol 2023. [PMCID: PMC9991160 DOI: 10.1093/jcag/gwac036.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Background Duodenal neuroendocrine tumours (D-NET) are rare cancers derived from neuroendocrine cells of the duodenum. A steady increase in the incidence of these tumours has been observed. Current treatment and surveillance strategies are guided by various tumour characteristics including size, grade, and depth of invasion. There exists conflicting evidence, however, on the rates of recurrence after positive resection margins following endoscopic resection. Thus, it remains uncertain whether complete endoscopic resection (R0) of these indolent tumours is clinically significant and whether follow-up endoscopic or surgical intervention is justified. Purpose Our aim is to characterize endoscopic management and clinical outcomes in patients undergoing endoscopic resection of D-NETs. Method We conducted a retrospective, single-centre cohort study at The Centre for Advanced Therapeutic Endoscopy and Endoscopic Oncology at St. Michael’s Hospital, Toronto, Ontario. Consecutive patients over the age of 18 who underwent endoscopic resection of histologically proven D-NETs between 2011 and 2020 were included. Data on patient, endoscopic, and tumour characteristics were collected through electronic chart review. Descriptive statistics were conducted for data analysis. Result(s) A total of 155 foregut neuroendocrine tumours (NET) were endoscopically resected amongst 96 patients during the study period. 47 of these were histologically identified as D-NETs. Mean tumour size was 9.88 ± 6.86 mm. Conventional endoscopic mucosal resection (EMR) was performed most frequently (55%, n=26/47), followed by cap-assisted EMR (30%, n=14/47). Hybrid endoscopic submucosal dissection (ESD)/EMR was performed in one case. A total of two intra-procedural perforations occurred, both of which were successfully closed endoscopically. One patient with a peri-ampullary D-NET experienced significant intra-procedural bleeding requiring Hemospray® and subsequent endotracheal intubation resulting in a brief hospitalization. 57% of all resected D-NETs were followed at surveillance endoscopy 1 (SE1) at a median interval of 199 days (range, 84 to 830). Positive resection margins (R1) were found in 26 cases (55%), of which 16 were assessed at SE1 while nine were lost to follow-up. One patient with R1 margins was electively treated with APC at SE1. Tumour recurrence at SE1 occurred in only two patients. Image ![]()
Conclusion(s) D-NET recurrence is found in less than 5% of patients at surveillance endoscopy following endoscopic resection in spite of a high R1 resection rate. Given this indolent nature of these tumours, our study suggests that patients with positive resection margins can be followed conservatively with surveillance endoscopy. Further investigation is warranted to determine the optimal duration and surveillance strategy for these patients. Please acknowledge all funding agencies by checking the applicable boxes below CAG Disclosure of Interest None Declared
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Affiliation(s)
- S Gupta
- Medicine, University of Toronto
| | - G Brar
- Medicine, University of Toronto
| | - K Zheng
- Medicine, University of Toronto
| | - S Hakim
- Laboratory Medicine and Pathobiology, St. Joseph’s Health Centre
| | - C W Teshima
- The Center for Advanced Therapeutic Endoscopy and Endoscopic Oncology, St. Michael’s Hospital
| | - G R May
- The Center for Advanced Therapeutic Endoscopy and Endoscopic Oncology, St. Michael’s Hospital
| | - C H Law
- Surgery, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - J Hallet
- Surgery, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - J D Mosko
- The Center for Advanced Therapeutic Endoscopy and Endoscopic Oncology, St. Michael’s Hospital
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Ku YS, Cheng SS, Cheung MY, Law CH, Lam HM. The Re-Localization of Proteins to or Away from Membranes as an Effective Strategy for Regulating Stress Tolerance in Plants. Membranes (Basel) 2022; 12:membranes12121261. [PMID: 36557168 PMCID: PMC9788111 DOI: 10.3390/membranes12121261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 06/12/2023]
Abstract
The membranes of plant cells are dynamic structures composed of phospholipids and proteins. Proteins harboring phospholipid-binding domains or lipid ligands can localize to membranes. Stress perception can alter the subcellular localization of these proteins dynamically, causing them to either associate with or detach from membranes. The mechanisms behind the re-localization involve changes in the lipidation state of the proteins and interactions with membrane-associated biomolecules. The functional significance of such re-localization includes the regulation of molecular transport, cell integrity, protein folding, signaling, and gene expression. In this review, proteins that re-localize to or away from membranes upon abiotic and biotic stresses will be discussed in terms of the mechanisms involved and the functional significance of their re-localization. Knowledge of the re-localization mechanisms will facilitate research on increasing plant stress adaptability, while the study on re-localization of proteins upon stresses will further our understanding of stress adaptation strategies in plants.
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Kagedan DJ, Frankul F, El-Sedfy A, McGregor C, Elmi M, Zagorski B, Dixon ME, Mahar AL, Vasilevska-Ristovska J, Helyer L, Rowsell C, Swallow CJ, Law CH, Coburn NG. Negative predictive value of preoperative computed tomography in determining pathologic local invasion, nodal disease, and abdominal metastases in gastric cancer. ACTA ACUST UNITED AC 2016; 23:273-9. [PMID: 27536178 DOI: 10.3747/co.23.3124] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
BACKGROUND Before undergoing curative-intent resection of gastric adenocarcinoma (ga), most patients undergo abdominal computed tomography (ct) imaging to determine contraindications to resection (local invasion, distant metastases). However, the ability to detect contraindications is variable, and the literature is limited to single-institution studies. We sought to assess, on a population level, the clinical relevance of preoperative ct in evaluating the resectability of ga tumours in patients undergoing surgery. METHODS In a provincial cancer registry, 2414 patients with ga diagnosed during 2005-2008 at 116 institutions were identified, and a primary chart review of radiology, operative, and pathology reports was performed for all patients. Preoperative abdominal ct reports were compared with intraoperative findings and final pathology reports (reference standard) to determine the negative predictive value (npv) of ct in assessing local invasion, nodal involvement, and intra-abdominal metastases. RESULTS Among patients undergoing gastrectomy, the npv of ct imaging in detecting local invasion was 86.9% (n = 536). For nodal metastasis, the npv of ct was 43.3% (n = 450). Among patients undergoing surgical exploration, the npv of ct for intra-abdominal metastases was 52.3% (n = 407). CONCLUSIONS Preoperative abdominal ct imaging reported as negative is most accurate in determining local invasion and least accurate in nodal assessment. The poor npv of ct should be taken into account when selecting patients for staging laparoscopy.
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Affiliation(s)
- D J Kagedan
- Division of General Surgery, Department of Surgery, University of Toronto, Toronto, ON; Department of General Surgery, Sunnybrook Health Sciences Centre, Toronto, ON; Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON
| | - F Frankul
- Department of General Surgery, Sunnybrook Health Sciences Centre, Toronto, ON
| | - A El-Sedfy
- Department of Surgery, Saint Barnabas Medical Center, Livingston, NJ, U.S.A
| | - C McGregor
- Department of Medical Imaging, Sunnybrook Health Sciences Centre, Toronto, ON
| | - M Elmi
- Division of General Surgery, Department of Surgery, University of Toronto, Toronto, ON; Department of General Surgery, Sunnybrook Health Sciences Centre, Toronto, ON; Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON
| | - B Zagorski
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON
| | - M E Dixon
- Department of Surgery, Maimonides Medical Center, Brooklyn, NY, U.S.A
| | - A L Mahar
- Department of Public Health Sciences, Queen's University, Kingston, ON
| | | | - L Helyer
- Division of General Surgery, Dalhousie University, Halifax, NS
| | - C Rowsell
- Department of Anatomic Pathology, Sunnybrook Health Sciences Centre, Toronto, ON
| | - C J Swallow
- Division of General Surgery, Department of Surgery, University of Toronto, Toronto, ON
| | - C H Law
- Division of General Surgery, Department of Surgery, University of Toronto, Toronto, ON; Department of General Surgery, Sunnybrook Health Sciences Centre, Toronto, ON; Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON
| | - N G Coburn
- Division of General Surgery, Department of Surgery, University of Toronto, Toronto, ON; Department of General Surgery, Sunnybrook Health Sciences Centre, Toronto, ON; Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON
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Su LK, Abdalla EK, Law CH, Kohlmann W, Rashid A, Vauthey JN. Biallelic inactivation of the APC gene is associated with hepatocellular carcinoma in familial adenomatous polyposis coli. Cancer 2001. [PMID: 11466687 DOI: 10.1002/1097-0142(20010715)92: 2<332: : aid-cncr1327>3.0.co; 2-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND Certain primary hepatic tumors have been associated with familial adenomatous polyposis (FAP), a condition caused by germline mutations of the adenomatous polyposis coli (APC) gene. However, a genetic association between FAP and hepatocellular carcinoma (HCC) has not been shown. This study tested the hypothesis that biallelic inactivation of the APC gene contributed to the development of HCC in a patient with FAP and a known germline mutation of the APC gene at codon 208, but no other risk factors for HCC. METHODS Total RNA and genomic DNA were isolated from the tumor, and in vitro synthesized protein assay and DNA sequencing analysis were used to screen for a somatic mutation in the APC gene. RESULTS A somatic one-base pair deletion at codon 568 was identified in the wild-type allele of the APC gene. CONCLUSIONS To the authors' knowledge, this study provides the first evidence that biallelic inactivation of the APC gene may contribute to the development of HCC in patients with FAP.
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Affiliation(s)
- L K Su
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
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Abstract
BACKGROUND Certain primary hepatic tumors have been associated with familial adenomatous polyposis (FAP), a condition caused by germline mutations of the adenomatous polyposis coli (APC) gene. However, a genetic association between FAP and hepatocellular carcinoma (HCC) has not been shown. This study tested the hypothesis that biallelic inactivation of the APC gene contributed to the development of HCC in a patient with FAP and a known germline mutation of the APC gene at codon 208, but no other risk factors for HCC. METHODS Total RNA and genomic DNA were isolated from the tumor, and in vitro synthesized protein assay and DNA sequencing analysis were used to screen for a somatic mutation in the APC gene. RESULTS A somatic one-base pair deletion at codon 568 was identified in the wild-type allele of the APC gene. CONCLUSIONS To the authors' knowledge, this study provides the first evidence that biallelic inactivation of the APC gene may contribute to the development of HCC in patients with FAP.
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Affiliation(s)
- L K Su
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
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Law CH, Brenneman FD, Rizoli SB, Boulanger BR, Hanna SS. Post-traumatic small-bowel stricture: a case report. Can J Surg 1996; 39:57-8. [PMID: 8599794 PMCID: PMC3895128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The use of lap seat belts has recently been recognized as a mechanism of blunt injury to the small bowel. Patients usually present immediately after injury and require urgent laparotomy. An unusual case of delayed small-bowel stricture after conservative management of an injury resulting from blunt trauma is reported. A 37-year-old woman involved in a high-speed motor vehicle accident was managed in hospital by observation. She had abdominal distension and pain, which gradually decreased and allowed slow introduction of a liquid diet. She was discharged from hospital but returned 6 weeks after injury with pain, abdominal distension, vomiting and obstipation. Stricture of an 8-cm segment of distal jejunum was found. Resection of the involved segment with primary anastomosis was curative.
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Affiliation(s)
- C H Law
- Department of Surgery, Sunnybrook Health Science Centre, University of Toronto, Toronto, Ont
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Chan SH, Chen F, Chio LF, Ho KT, Law CH, Leong SF, Mathew T, Ng PL, Oon CJ, Seah CS, Simons MJ, Tan A, Tan IK. Hepatitis B virus and alphafetoprotein in liver diseases in Singapore. Singapore Med J 1980; 21:506-8. [PMID: 6156492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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10
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MacLennan R, Da Costa J, Day NE, Law CH, Ng YK, Shanmugaratnam K. Risk factors for lung cancer in Singapore Chinese, a population with high female incidence rates. Int J Cancer 1977; 20:854-60. [PMID: 591126 DOI: 10.1002/ijc.2910200606] [Citation(s) in RCA: 183] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The high incidence of lung cancer in Chinese females in Singapore, especially among those belonging to the Cantonese dialect group, and the relatively high rates in Chinese males have been studied by means of interviews of cases and controls. A significant dose-response effect of cigarette smoking was found for all male and female groups, but neither smoking nor any other exposure explains the high incidence of lung cancer observed in Cantonese females who exhibit high rates of adenocarcinoma appraently unrelated to smoking. In general, persons with a low consumption of green vegetables were at higher risk for lung cancer. This finding might be due to an increased susceptibility in the presence of a relative deficiency of vitamin A.
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Sinniah R, Law CH, Pwee HS. Glomerular lesions in patients with asymptomatic persistent andorthostatic proteinuria discovered on routine medical examination. Clin Nephrol 1977; 7:1-14. [PMID: 318947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The incidence of asymptomatic proteinuria in young healthy men entering the army service in Singapore was 0.94%; 0.56% had intermittent orthostatic proteinuria and 0.38% with persistent proteinuria. Renal biopsies from 45 cases with persistent proteinuria and 10 cases with orthostatic proteinuria were studied by light microscopy, electron microscopic and immunofluorescent antibody techniques. Three cases with orthostatic proteinuria showed a minimal lesion ('Nil'), and 7 a minimal lesion with increased centrilobular mesangial matrix and mild focal and segmental mesangial hypercellularity. Focal and segmental capillary loop changes were seen in two cases. No immunoglobulin deposits were found in orthostatic proteinuria. A raised anti-streptolysin O titer was found in 3 cases. 13.3% of cases with persistent proteinuria showed a minimal lesion ('Nil'); 66.6% a minimal lesion with increased centrilobular mesangial matrix and mild focal and segmental mesangial hypercellularity: Focal global sclerosis, focal segmental sclerosing glomerulonephritis and diffuse proliferative GN (mesangial hypercellularity) were each found in 6.7% of patients in this group. Focal and segmental changes in capillary loops were found in 30% of cases. Changes in visceral epithelium such as the appearance of cytoplasmic swelling, vesicles and dense aggregates, and areas of focal foot process fusion were common findings. Mesangial deposits of IgA were found in 34.3%, with an IgA-IgG-beta1C globulin combination in 28.6% of cases. IgM-beta1C globulin was present in 5.7% of cases with persistent proteinuria. Early complement components, C1q and C4, and IgA secretory piece were absent. A raised antistreptolysin O titer was found in 25% of cases. The changes inthe glomeruli may represent the end or healing stages of an early bout of glomerulonephritis. Changed hemodynamic responses on assuming an upright position may play a role in the loss of protein across the glomerular basement membrane in patients with orthostatic proteinuria.
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Abstract
The demonstration of hepatitis B antigen in the liver cells in formalin fixed paraffin embedded tissues by Shikata's orcein staining method affords an opportunity to conduct retrospective studies on necrospy materials. Such a study in Singapore showed orcein-positive liver cells in 22 out of 52 (42.3%) and 37 out of 50 (74.0%) cases of cirrhosis of the liver and hepatocellular carcinoma respectively, while only 5 out of 113 (4.4%) 'normal' livers gave positive results. There is a significant difference in the frequency of hepatocellular carcinoma in orcein-positive and orcein-negative cirrhotic livers (28 out of 50, 10 out of 40 respectively). These results suggest a possible aetiological relationship between hepatitis B antigen and hepatocellular carcinoma.
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Law CH, Goh EH, Shanmugaratnam K. Malignant melanomas of the upper respiratory tract. Singapore Med J 1976; 17:133-7. [PMID: 1019610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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14
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Foo KT, Sridharan M, Ong SC, Law CH. Primary carcinoma of duodenum--a case report. Singapore Med J 1976; 17:109-12. [PMID: 982087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Law CH, Day NE, Shanmugaratnam K. Incidence rates of specific histological types of lung cancer in Singapore Chinese dialect groups, and their aetiological significance. Int J Cancer 1976; 17:304-9. [PMID: 1254354 DOI: 10.1002/ijc.2910170305] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Significant differences in the incidence levels of lung cancer have been observed among major Chinese dialect groups or communities (Kokkien, Teochew and Cantonese) in Singapore. Among males, the incidence rate is highest in the Hokkiens (age-standardized incidence rate per 100,000 persons per year in Hokkien 67.8, Teochew 55.3, Cantonese 54.0) and among females, it is highest in the Cantonese (Hokkien 12.4, Teochew 12.8, Cantonese 27.2). The present investigation was undertaken to determine the incidence rates of each of the main histological types of lung cancer in the Chinese population and to determine whether there are any correlations between histological patterns and the dialect group differentials that may be of aetiological significance. During the period 1968-1972, a total of 1,747 cases of lung cancer (1,285 males and 462 females) were reported to the Singapore Cancer Registry. It proved possible to type the neoplasms histologically in 476 males (37.0%) and 154 females (33.3%). Age-standardized rates by histological type were computed on the assumption that those histologically typed were a representative sample of all lung cancers. This study shows that Hokkien males have a significantly higher incidence rate of epidermoid carcinoma than the other dialect groups (Hokkien 36.1, Teochew 21.1, Cantonese 17.3). The Cantonese females have significantly higher incidence rates of both epidermoid carcinoma (Hokkien 3.7, Teochew 2.3, Cantonese 5.9) and adenocarcinoma (Hokkien 4.6, Teochew 3.6, Cantonese 11.9). Various sources of bias in studied of this type were examined; it is concluded that the differences in the histologic-specific incidence rates of lung cancer among the various Chinese dialect groups in Singapore are real and not artefactual. The significance of these findings in relation to possible aetiological factors is discussed.
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