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.
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Acknowledgments
The authors thank all study participants of the Colon Cancer Family Registry and staff for their contributions to this project.
Funding
This work was supported by Grant UM1 CA167551 from the National Cancer Institute, National Institutes of Health (NIH) and through cooperative agreements with members of the Colon Cancer Family Registry (CFR) and Principal Investigators. Collaborating centers include Australasian Colorectal Cancer Family Registry (U01/U24 CA097735), Mayo Clinic Cooperative Family Registry for Colon Cancer Studies (U01/U24 CA074800), Ontario Familial Colorectal Cancer Registry (U01/U24 CA074783), Seattle Colorectal Cancer Family Registry (U01/U24 CA074794), Stanford Consortium Colorectal Cancer Family Registry (U01/U24 CA074799), and University of Hawaii Colorectal Cancer Family Registry (U01/U24 CA074806). A.K.W. is an Australian National Health and Medical Research Council (NHMRC) Early Career Fellow. M.A.J. is an NHMRC Senior Research Fellow. J.L.H. is a NHMRC Senior Principal Research Fellow. D.D.B. is a University of Melbourne Research at Melbourne Accelerator Program (R@MAP) Senior Research Fellow.
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Disclaimer: The content of this manuscript does not necessarily reflect the views or policies of the National Cancer Institute or any of the collaborating centers in the CFRs, nor does mention of trade names, commercial products, or organizations imply endorsement by the US Government or the CFR.
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Win, A.K., Reece, J.C., Buchanan, D.D. et al. Risk of colorectal cancer for people with a mutation in both a MUTYH and a DNA mismatch repair gene. Familial Cancer 14, 575–583 (2015). https://doi.org/10.1007/s10689-015-9824-x
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DOI: https://doi.org/10.1007/s10689-015-9824-x