scholarly journals Rectal Cancer Diagnosed after Cesarean Section in Which High Microsatellite Instability Indicated the Presence of Lynch Syndrome

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Tomohiro Okuda ◽  
Hiroshi Ishii ◽  
Sadao Yamashita ◽  
Sakura Ijichi ◽  
Seiki Matsuo ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Rectal Cancer ◽  
Family History ◽  
Cesarean Section ◽  
Lynch Syndrome ◽  
Microsatellite Instability ◽  
Birth Canal ◽  
Emergency Cesarean ◽  
History Of ◽  
Revised Bethesda Guidelines

We report a case of rectal cancer with microsatellite instability (MSI) that probably resulted from Lynch syndrome and that was diagnosed after Cesarean section. The patient was a 28-year-old woman (gravid 1, para 1) without a significant medical history. At 35 gestational weeks, vaginal ultrasonography revealed a 5 cm tumor behind the uterine cervix, which was diagnosed as a uterine myoma. The tumor gradually increased in size and blocked the birth canal, resulting in the patient undergoing an emergency Cesarean section. Postoperatively, the tumor was diagnosed as rectal cancer with MSI. After concurrent chemoradiation therapy, a lower anterior resection was performed. The patient’s family history revealed she met the criteria of the revised Bethesda guidelines for testing the colorectal tumor for MSI. Testing revealed that the tumor did indeed show high MSI and, combined with the family history, suggested this could be a case of Lynch syndrome. Our findings emphasize the importance of considering the possibility of Lynch syndrome in pregnant women with colorectal cancer, particularly those with a family history of this condition. We suggest that the presence of Lynch syndrome should also be considered for any young woman with endometrial, ovarian, or colorectal cancer.

TUMOUR PATHOLOGY PREDICTS MICROSATELLITE INSTABILITY IN A POPULATION-BASED SERIES OF COLORECTAL CANCER CASES

2008 ◽  
Vol 31 (4) ◽  
pp. 12
Author(s):  
A J Hyde ◽  
D Fontaine ◽  
R C Green ◽  
M Simms ◽  
P S Parfrey ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Lynch Syndrome ◽  
Microsatellite Instability ◽  
Population Based ◽  
Pathological Features ◽  
Predictive Tool ◽  
Entire Cohort ◽  
Dna Mismatch ◽  
Bethesda Guidelines ◽  
Revised Bethesda Guidelines

Background: Lynch Syndrome is an autosomal dominant trait that accounts forapproximately 3% of all cases of colorectal cancer (CRC). It is caused by mutations in DNA mismatch repair (MMR) genes, most commonly MLH1 or MSH2. These MMR defects cause high levels of microsatellite instability (MSI-H) in the tumours. MSI testing of all CRCs to identify potential Lynch Syndrome cases is not practical, so the Bethesda Guidelines, which use clinical and pathological features, were created to identify those tumours most likely to be MSI-H^1. In 2007 Jenkins et. al. created MsPath, a tool based on the pathological features described in the rarely used 3^rd Bethesda criterion, to improve prediction of MSI-H tumours among CRC cases diagnosed before age 60 years^2. Methods: We collected a population-based cohort of 716 CRC cases diagnosed before age 75 years in Newfoundland. For each of these cases we collected family history, performed MSI analysis, and scored a number of pathological features for the purpose of evaluating the accuracy of the Bethesda Criteria and MsPath at predicting MSI-H tumours. Results: Our work validates the MsPath tool in the Newfoundland population for the same age group used to create the tool. We found it identified MSI-H cases with a sensitivity of 95% and specificity of 35% in our population of CRCcases diagnosed before age 60 years (n=290). We also tested this tool on our older population of CRCcases, diagnosed at ages 60 to 74 years (n=426). We found it to be at least as predictive in this population,with a sensitivity of 95% and a specificity of 42%. We then used our entire cohort (N=716) to compare MsPath with the other Bethesda criteria.Bethesda criteria 1, 2, 4 and 5 together predicted MSI-H cases with a sensitivity of 67% and a specificity of 51%. MsPath was better at identifying these cases, with a sensitivity of 95% and a specificity of 39%. Conclusions: We conclude that MsPath can be extended to include patients diagnosed with CRC before age 75 years. As well, we have found that MsPath is a better predictive tool than the Revised Bethesda Guidelines for identifying MSI-H cases within a population-based setting of colorectal cancer. References: 1. Umar, A. et. al. J Natl Cancer Inst 2004;96:261-8 2.Jenkins, M.A. et. al. Gastroenterology 2007;133:48-56

scholarly journals The Association of Tumor Microsatellite Instability Phenotype with Family History of Colorectal Cancer

2009 ◽  
Vol 18 (3) ◽  
pp. 967-975 ◽  
Author(s):  
Bharati Bapat ◽  
Noralane M. Lindor ◽  
John Baron ◽  
Kim Siegmund ◽  
Lin Li ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Family History ◽  
Microsatellite Instability ◽  
History Of ◽  
Instability Phenotype

scholarly journals Family History of Colorectal Cancer Is Not Associated with Colorectal Cancer Survival Regardless of Microsatellite Instability Status

2014 ◽  
Vol 23 (8) ◽  
pp. 1700-1704 ◽  
Author(s):  
Amanda I. Phipps ◽  
Dennis J. Ahnen ◽  
Peter T. Campbell ◽  
Aung Ko Win ◽  
Mark A. Jenkins ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Family History ◽  
Microsatellite Instability ◽  
Cancer Survival ◽  
Colorectal Cancer Survival ◽  
History Of

scholarly journals The Effectiveness of Clinical Guidelines in the Diagnosis of Lynch Syndrome Compared to Microsatellite Instability and Immunohistochemistry Analyses in Southern Thailand

2019 ◽  
Author(s):  
Thitipat Thavornpattanapong ◽  
Kanet Kanjanapradit ◽  
Surasak Sangkhathat ◽  
Worrawit Wanitsuwan
Keyword(s):  
Lynch Syndrome ◽  
Microsatellite Instability ◽  
Sensitivity And Specificity ◽  
Demographic Data ◽  
High Specificity ◽  
Molecular Testing ◽  
Tissue Samples ◽  
Molecular Tests ◽  
History Of ◽  
Revised Bethesda Guidelines

Objective: This study aims to assess the accuracy of Amsterdam II criteria (AMII) and Revised Bethesda Guidelines (RBG) compared to molecular tests in Thai patients.Material and Methods: One hundred eighty-one patients were enrolled. Demographic data and pathological features and locations of tumors were recorded. Family history of the patients was reviewed by AMII and RBG. Tissue samples were collected and molecular testing was tested by microsatellite instability (MSI) analysis and immunohistochemistry (IHC). Statistical analysis was used to estimate the sensitivity and specificity of AMII and RBG compared to molecular testing.Results: Of the patients, 2.8% fulfilled the AMII criteria and 28.1% met the RBG criteria. Molecular testing showed 16.57% and 13.8% of the samples lost at least 1 out of 4 mismatch repair (MMR) proteins in the IHC test. In addition, 10.5% of patients had both microsatellite instability high (MSI-H) and loss of protein MMR expression. The sensitivity and specificity of AMII were 6.7% and 98.0%, respectively, while for the RBG they were 70.0% and 82.1%, respectively.Conclusion: The present study suggests that for patients who complete the AMII, doctors should be highly suspicious of Lynch syndrome, due to its high specificity. The RBG is useful for screening for Lynch syndrome and the selection of individuals for further molecular testing.

scholarly journals Prevalence and spectrum of MLH1, MSH2, and MSH6 pathogenic germline variants in Pakistani colorectal cancer patients

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Muhammad Usman Rashid ◽  
Humaira Naeemi ◽  
Noor Muhammad ◽  
Asif Loya ◽  
Jan Lubiński ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Family History ◽  
Lynch Syndrome ◽  
Research Centre ◽  
Germline Variants ◽  
Pathogenic Variants ◽  
History Of ◽  
Group 2 ◽  
Colorectal Cancer Patients ◽  
Group 1

Abstract Background Pathogenic germline variants in MLH1, MSH2 and MSH6 genes account for the majority of Lynch syndrome (LS). In this first report from Pakistan, we investigated the prevalence of pathogenic MLH1/MSH2/MSH6 variants in colorectal cancer (CRC) patients. Methods Consecutive cases (n = 212) were recruited at the Shaukat Khanum Memorial Cancer Hospital and Research Centre (SKMCH&RC), between November 2007 to March 2011. Patients with a family history of > 3 or 2 HNPCC-associated cancers were classified as HNPCC (n = 9) or suspected-HNPCC (n = 20), respectively (group 1; n = 29). Cases with no family history were designated as non-HNPCC (group 2; n = 183). MLH1/MSH2/MSH6 genes were comprehensively screened in group 1. Pathogenic/likely pathogenic variants identified in group 1 were subsequently evaluated in group 2. Results Eight distinct pathogenic/likely pathogenic MLH1/MSH2 variants were found in group 1 (10/29; 34.5%), belonging to HNPCC (5/9; 55.6%) and suspected-HNPCC (5/20; 25%) families and in group 2 (2/183; 1.1%) belonging to non-HNPCC. Overall, three recurrent variants (MSH2 c.943-1G > C, MLH1 c.1358dup and c.2041G > A) accounted for 58.3% (7/12) of all families harboring pathogenic/likely pathogenic MLH1/MSH2 variants. Pathogenic MSH6 variants were not detected. Conclusion Pathogenic/likely pathogenic MLH1/MSH2 variants account for a substantial proportion of CRC patients with HNPCC/suspected-HNPCC in Pakistan. Our findings suggest that HNPCC/suspected-HNPCC families should be tested for these recurrent variants prior to comprehensive gene screening in this population.

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