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. 2018 Oct 10;36(29):2961-2968.
doi: 10.1200/JCO.2018.78.4777. Epub 2018 Aug 30.

Cancer Risks for PMS2-Associated Lynch Syndrome

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Cancer Risks for PMS2-Associated Lynch Syndrome

Sanne W Ten Broeke et al. J Clin Oncol. .

Erratum in

  • Errata.
    [No authors listed] [No authors listed] J Clin Oncol. 2019 Mar 20;37(9):761. doi: 10.1200/JCO.19.00316. J Clin Oncol. 2019. PMID: 30875485 Free PMC article. No abstract available.

Abstract

Purpose: Lynch syndrome due to pathogenic variants in the DNA mismatch repair genes MLH1, MSH2, and MSH6 is predominantly associated with colorectal and endometrial cancer, although extracolonic cancers have been described within the Lynch tumor spectrum. However, the age-specific cumulative risk (penetrance) of these cancers is still poorly defined for PMS2-associated Lynch syndrome. Using a large data set from a worldwide collaboration, our aim was to determine accurate penetrance measures of cancers for carriers of heterozygous pathogenic PMS2 variants.

Methods: A modified segregation analysis was conducted that incorporated both genotyped and nongenotyped relatives, with conditioning for ascertainment to estimates corrected for bias. Hazard ratios (HRs) and corresponding 95% CIs were estimated for each cancer site for mutation carriers compared with the general population, followed by estimation of penetrance.

Results: In total, 284 families consisting of 4,878 first- and second-degree family members were included in the analysis. PMS2 mutation carriers were at increased risk for colorectal cancer (cumulative risk to age 80 years of 13% [95% CI, 7.9% to 22%] for males and 12% [95% CI, 6.7% to 21%] for females) and endometrial cancer (13% [95% CI, 7.0%-24%]), compared with the general population (6.6%, 4.7%, and 2.4%, respectively). There was no clear evidence of an increased risk of ovarian, gastric, hepatobiliary, bladder, renal, brain, breast, prostate, or small bowel cancer.

Conclusion: Heterozygous PMS2 mutation carriers were at small increased risk for colorectal and endometrial cancer but not for any other Lynch syndrome-associated cancer. This finding justifies that PMS2-specific screening protocols could be restricted to colonoscopies. The role of risk-reducing hysterectomy and bilateral salpingo-oophorectomy for PMS2 mutation carriers needs further discussion.

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Figures

Fig 1.
Fig 1.
Cumulative risks (solid lines) and corresponding 95% CIs (dotted lines) of (A) colorectal cancer, and (B) endometrial cancer for heterozygous PMS2 mutation carriers, and for the US general population (dashed lines). Blue and gold represent males and females, respectively.
Fig 2.
Fig 2.
Hazard ratios (HRs) and corresponding 95% CIs of extracolonic cancers for PMS2 mutation carriers.

References

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    1. Harkness EF, Barrow E, Newton K, et al. : Lynch syndrome caused by MLH1 mutations is associated with an increased risk of breast cancer: A cohort study. J Med Genet 52:553-556, 2015 - PubMed
    1. Win AK, Lindor NM, Young JP, et al. : Risks of primary extracolonic cancers following colorectal cancer in Lynch syndrome. J Natl Cancer Inst 104:1363-1372, 2012 - PMC - PubMed

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