Risks of primary extracolonic cancers following colorectal cancer in lynch syndrome

Aung Ko Win, N Lindor, Joanne Young, Finlay Macrae, Graeme Young, Elizabeth Williamson, Susan Parry, Jack Goldblatt, Lara Lipton, Ingrid Winship, Katherine Tucker, Graham Giles, Daniel Buchanan, Mark Clendenning, Christophe Rosty, Julie Arnold, A Levine, Steven Gallinger, Loic Le Marchand, Polly NewcombJohn Hopper, Mark Jenkins

    Research output: Contribution to journalArticlepeer-review

    143 Citations (Scopus)

    Abstract

    Background Lynch syndrome is a highly penetrant cancer predisposition syndrome caused by germline mutations in DNA mismatch repair (MMR) genes. We estimated the risks of primary cancers other than colorectal cancer following a diagnosis of colorectal cancer in mutation carriers.MethodsWe obtained data from the Colon Cancer Family Registry for 764 carriers of an MMR gene mutation (316 MLH1, 357 MSH2, 49 MSH6, and 42 PMS2), who had a previous diagnosis of colorectal cancer. The KaplanMeier method was used to estimate their cumulative risk of cancers 10 and 20 years after colorectal cancer. We estimated the age-, sex-, country-and calendar periodspecific standardized incidence ratios (SIRs) of cancers following colorectal cancer, compared with the general population.ResultsFollowing colorectal cancer, carriers of MMR gene mutations had the following 10-year risk of cancers in other organs: kidney, renal pelvis, ureter, and bladder (2%, 95% confidence interval [CI] = 1% to 3%); small intestine, stomach, and hepatobiliary tract (1%, 95% CI = 0.2% to 2%); prostate (3%, 95% CI = 1% to 5%); endometrium (12%, 95% CI = 8% to 17%); breast (2%, 95% CI = 1% to 4%); and ovary (1%, 95% CI = 0% to 2%). They were at elevated risk compared with the general population: cancers of the kidney, renal pelvis, and ureter (SIR = 12.54, 95% CI = 7.97 to 17.94), urinary bladder (SIR = 7.22, 95% CI = 4.08 to 10.99), small intestine (SIR = 72.68, 95% CI = 39.95 to 111.29), stomach (SIR = 5.65, 95% CI = 2.32 to 9.69), and hepatobiliary tract (SIR = 5.94, 95% CI = 1.81 to 10.94) for both sexes; cancer of the prostate (SIR = 2.05, 95% CI = 1.23 to 3.01), endometrium (SIR = 40.23, 95% CI = 27.91 to 56.06), breast (SIR = 1.76, 95% CI = 1.07 to 2.59), and ovary (SIR = 4.19, 95% CI = 1.28 to 7.97).ConclusionCarriers of MMR gene mutations who have already had a colorectal cancer are at increased risk of a greater range of cancers than the recognized spectrum of Lynch syndrome cancers, including breast and prostate cancers.

    Original languageEnglish
    Pages (from-to)1363-1372
    Number of pages10
    JournalJournal of The National Cancer Institute
    Volume104
    Issue number18
    DOIs
    Publication statusPublished - 19 Sep 2012

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