Risk of colorectal cancer for carriers of a germ-line mutation in POLE or POLD1. - PubMed - NCBI
Genet Med. 2017 Nov 9. doi: 10.1038/gim.2017.185. [Epub ahead of print]
Risk of colorectal cancer for carriers of a germ-line mutation in POLE or POLD1.
Buchanan DD1,2,3,
Stewart JR1,
Clendenning M1,
Rosty C1,4,5,
Mahmood K1,6,
Pope BJ1,6,
Jenkins MA2,
Hopper JL2,
Southey MC7,
Macrae FA3,8,9,
Winship IM3,8,
Win AK2,3.
Abstract
BackgroundGerm-line mutations in the exonuclease domains of the POLE and POLD1 genes are associated with an increased, but yet unquantified, risk of colorectal cancer (CRC).MethodsWe identified families with POLE or POLD1 variants by searching PubMed for relevant studies prior to October 2016 and by genotyping 669 population-based CRC cases diagnosed in patients under 60 years of age, from the Australasian Colorectal Cancer Family Registry. We estimated the age-specific cumulative risks (penetrance) using a modified segregation analysis.ResultsWe observed 67 CRCs (mean age at diagnosis = 50.2 (SD = 13.8) years) among 364 first- and second- degree relatives from 41 POLE families, and 6 CRCs (mean age at diagnosis = 39.7 (SD = 6.83) years) among 69 relatives from 9 POLD1 families. We estimated risks of CRC up to the age of 70 years (95% confidence interval) for males and females, respectively, to be 40% (26-57%) and 32% (20-47%) for POLE mutation carriers and 63% (15-99%) and 52% (11-99%) for POLD1 mutation carriers.ConclusionCRC risks for POLE mutation carriers are sufficiently high to warrant consideration of annual colonoscopy screening and implementation of management guidelines comparable to those applied in cases of Lynch syndrome. Refinement of estimates of CRC risk for POLD1 carriers is needed; however, clinical management recommendations could follow those made for POLE carriers.GENETICS in MEDICINE advance online publication, 9 November 2017; doi:10.1038/gim.2017.185.
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