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Short Communication |
From the Department of Medical Genetics,*Programme of Neurosciences, and the Department of Neurology,Biomedicum Helsinki, University of Helsinki, Helsinki, Finland; the Molecular and Population Genetics Laboratory,Cancer Research UK, London, United Kingdom; the Departments of Pathologyand Surgery,¶Kuopio University Central Hospital, Kuopio, Finland; the Department of Surgery,||Jyväskylä Central Hospital, Jyväskylä, Finland; the Second Department of Surgery,**Helsinki University Central Hospital, Helsinki, Finland
Recessively inherited mutations in the base excision repair gene MYH have recently been associated with predisposition to colorectal adenomas and cancer in materials selected for occurrence of multiple adenomas. In particular, variants Y165C and G382D have been shown to play a role in Caucasian patients. To evaluate the contribution of MYH mutations to colorectal cancer burden on the population level, and to examine the MYH-associated phenotype in an unselected series of colorectal cancer patients, we determined the frequencies of Y165C and G382D MYH mutations in a population-based series of 1042 Finnish colorectal cancer patients. Four (0.4%) patients had both MYH alleles mutated. Although all these patients had multiple adenomatous polyps, the phenotypes tended to be less extreme than in previous studies on selected cases. The lowest number of colorectal adenomas at the time of cancer diagnosis was five. Cases with one mutant MYH allele were subjected to sequencing of all exons to detect possible Finnish founder mutations, but no additional changes were detected. The Y165C and G382D variants were not present in 424 Finnish cancer-free controls showing that MYH mutations are not enriched in the population. As evaluated against national Finnish Polyposis Registry data MYH-associated colorectal cancer appears to be as common as colorectal cancer associated with familial adenomatous polyposis.
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