Multigene Panel Testing Provides a New Perspective on Lynch Syndrome

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Carin R EspenschiedHeather Hampel

Abstract

Purpose Most existing literature describes Lynch syndrome (LS) as a hereditary syndrome leading to high risks of colorectal cancer (CRC) and endometrial cancer mainly as a result of mutations in MLH1 and MSH2. Most of these studies were performed on cohorts with disease suggestive of hereditary CRC and population-based CRC and endometrial cancer cohorts, possibly biasing results. We aimed to describe a large cohort of mismatch repair (MMR) mutation carriers ascertained through multigene panel testing, evaluate their phenotype, and compare the results with those of previous studies. Methods We retrospectively reviewed clinical histories of patients who had multigene panel testing, including the MMR and EPCAM genes, between March 2012 and June 2015 (N = 34,981) and performed a series of statistical comparisons. Results Overall, MSH6 mutations were most frequent, followed by PMS2, MSH2, MLH1, and EPCAM mutations, respectively. Of 528 patients who had MMR mutations, 63 (11.9%) had breast cancer only and 144 (27.3%) had CRC only. When comparing those with breast cancer only to those with CRC only, MSH6 and PMS2 mutations were more frequent than MLH1 and MSH2 mutations ( P = 2.3 × 10-5). Of the 528 patients, 22.2% met BRCA1 and BRCA2...Continue Reading

Associated Clinical Trials

Aug 31, 2020·Katherine Nathanson, MD

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