Abstract：
:The base excision repair protein, MUTYH, functionally interacts with the DNA mismatch repair (MMR) system. As genetic testing moves from testing one gene at a time, to gene panel and whole exome next generation sequencing approaches, understandin g the risk associated with co-existence of germline mutations in these genes will be important for clinical interpretation and management. From the Colon Cancer Family Registry, we identified 10 carriers who had both a MUTYH mutation (6 with c.1187G>A p.(Gly396Asp), 3 with c.821G>A p.(Arg274Gln), and 1 with c.536A>G p.(Tyr179Cys)) and a MMR gene mutation (3 in MLH1, 6 in MSH2, and 1 in PMS2), 375 carriers of a single (monoallelic) MUTYH mutation alone, and 469 carriers of a MMR gene mutation alone. Of the 10 carriers of both gene mutations, 8 were diagnosed with colorectal cancer. Using a weighted cohort analysis, we estimated that risk of colorectal cancer for carriers of both a MUTYH and a MMR gene mutation was substantially higher than that for carriers of a MUTYH mutation alone [hazard ratio (HR) 21.5, 95% confidence interval (CI) 9.19-50.1; p < 0.001], but not different from that for carriers of a MMR gene mutation alone (HR 1.94, 95% CI 0.63-5.99; p = 0.25). Within the limited power of this study, there was no evidence that a monoallelic MUTYH gene mutation confers additional risk of colorectal cancer for carriers of a MMR gene mutation alone. Our finding suggests MUTYH mutation testing in MMR gene mutation carriers is not clinically informative.
journal_name
Fam Cancerjournal_title
Familial cancerauthors
Win AK,Reece JC,Buchanan DD,Clendenning M,Young JP,Cleary SP,Kim H,Cotterchio M,Dowty JG,MacInnis RJ,Tucker KM,Winship IM,Macrae FA,Burnett T,Le Marchand L,Casey G,Haile RW,Newcomb PA,Thibodeau SN,Lindor NM,Hopperdoi
10.1007/s10689-015-9824-xsubject
Has Abstractpub_date
2015-12-01 00:00:00pages
575-83issue
4eissn
1389-9600issn
1573-7292pii
10.1007/s10689-015-9824-xjournal_volume
14pub_type
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