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01-07-2020 | Colorectal Cancer | Original Article

Do the risks of Lynch syndrome-related cancers depend on the parent of origin of the mutation?

Authors: Shimelis Dejene Gemechu, Christine M. van Vliet, Aung Ko Win, Jane C. Figueiredo, Loic Le Marchand, Steven Gallinger, Polly A. Newcomb, John L. Hopper, Noralane M. Lindor, Mark A. Jenkins, James G. Dowty

Published in: Familial Cancer | Issue 3/2020

Abstract

Individuals who carry pathogenic mutations in DNA mismatch repair (MMR) genes have high risks of cancer, and small studies have suggested that these risks depend on the sex of the parent from whom the mutation was inherited. We have conducted the first large study of such a parent-of-origin effect (POE). Our study was based on all MMR gene mutation carriers and their relatives in the Colon Cancer Family Registry, comprising 18,226 people. The POE was estimated as a hazard ratio (HR) using a segregation analysis approach that adjusted for ascertainment. HR = 1 corresponds to no POE and HR > 1 corresponds to higher risks for maternal mutations. For all MMR genes combined, the estimated POE HRs were 1.02 (95% confidence interval (CI) 0.75–1.39, p = 0.9) for male colorectal cancer, 1.12 (95% CI 0.81–1.54, p = 0.5) for female colorectal cancer and 0.84 (95% CI 0.52–1.36, p = 0.5) for endometrial cancer. Separate results for each MMR gene were similar. Therefore, despite being well-powered, our study did not find any evidence that cancer risks for MMR gene mutation carriers depend on the parent-of-origin of the mutation. Based on current evidence, we do not recommend that POEs be incorporated into the clinical guidelines or advice for such carriers.

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Title: Do the risks of Lynch syndrome-related cancers depend on the parent of origin of the mutation?
Authors: Shimelis Dejene Gemechu
Christine M. van Vliet
Aung Ko Win
Jane C. Figueiredo
Loic Le Marchand
Steven Gallinger
Polly A. Newcomb
John L. Hopper
Noralane M. Lindor
Mark A. Jenkins
James G. Dowty
Publication date: 01-07-2020
Publisher: Springer Netherlands
Keywords: Colorectal Cancer
Colorectal Cancer
Endometrial Cancer
Endometrial Cancer
Published in: Familial Cancer / Issue 3/2020
Print ISSN: 1389-9600
Electronic ISSN: 1573-7292
DOI: https://doi.org/10.1007/s10689-020-00167-4

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