Cancer risks for mismatch repair gene mutation carriers: a population-based early onset case-family study.

Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association
Mark A JenkinsMelissa C Southey

Abstract

Cancer risks for mismatch repair gene mutation carriers have been derived almost exclusively using families ascertained owing to their strong cancer family history. These may be overestimates, due to analytic problems, and not generalizable. We estimated average cancer risks for mutations identified in population-based early onset colorectal cancer cases (probands) unselected for family history. Data were cancer histories and mutation status (carrier, non-carrier, or unknown) of 17 mismatch repair gene mutation carrier probands with colorectal cancer diagnosed before age 45 (8 hMLH1, 4 hMSH2, 4 hMSH6, 1 hPMS2) and their first- and second-degree relatives. We used modified segregation analysis theory, adjusting for the family being ascertained through the proband being an early onset mutation carrier. Eleven carrier probands (64%) were from families meeting the Amsterdam II criteria for hereditary nonpolyposis colorectal cancer. The cumulative risk for colorectal cancer (95% confidence interval) to age 70 was 45% (29%-62%) for men and 38% (19%-51%) for women. Corresponding risks were 67% (47%-84%) and 72% (48%-85%) for any hereditary nonpolyposis colorectal cancer-related cancer. Compared with the general population, colorectal ...Continue Reading

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