Abstract
To compare the phenotypic expression of three different MSH2 mutations causing Lynch syndrome, 290 family members at 50% risk of inheriting a mutation were studied. Two truncating mutations of the MSH2 gene have been identified in Newfoundland: an exon 8 deletion in five families (N=74 carriers) and an exon 4–16 deletion in one family (N=65 carriers). The third mutation was an intron 5 splice site mutation resulting in deletion of exon 5 in RNA and occurred in 12 families (N=151 carriers). Age to onset of first cancer, first colorectal cancer (CRC), first extracolonic cancers and death were compared. By age 60, 89% of family members with the intron 5 mutation, 81% with the exon 8 deletion, and 85% with the exon 4–16 deletion had developed cancer. For all three mutations males had a higher age-related risk of CRC and death compared to females. In the intron 5 splice site mutation carriers, the number of transitional cell cancers of the urinary tract was significantly lower and time to first ovarian cancer was significantly higher than in the carriers of the genomic deletions. The incidence of CRC in MSH2 mutation carriers, exposed to the same environment, is not modified by the specific mutation, although there is a suggestion that type of mutation may influence development of some extracolonic cancers.
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Funding was received from the Canadian Institute for Health Research through the Colorectal Cancer Interdisciplinary Health research Team at the University of Toronto and Memorial University (Team Leader: Dr. John McLaughlin). Dr Parfrey holds a CIHR-RPP Distinguished Scientist Award.
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Drs. Roger Green and Jane Green share equal responsibilities for this paper.
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Stuckless, S., Parfrey, P.S., Woods, M.O. et al. The phenotypic expression of three MSH2 mutations in large Newfoundland families with Lynch syndrome. Familial Cancer 6, 1–12 (2007). https://doi.org/10.1007/s10689-006-0014-8
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DOI: https://doi.org/10.1007/s10689-006-0014-8