Journal Article

Lifetime Risk of Melanoma in CDKN2A Mutation Carriers in a Population-Based Sample

Colin B. Begg, Irene Orlow, Amanda J. Hummer, Bruce K. Armstrong, Anne Kricker, Loraine D. Marrett, Robert C. Millikan, Stephen B. Gruber, Hoda Anton-Culver, Roberto Zanetti, Richard P. Gallagher, Terence Dwyer, Timothy R. Rebbeck, Nandita Mitra, Klaus Busam, Lynn From and Marianne Berwick

in JNCI: Journal of the National Cancer Institute

Volume 97, issue 20, pages 1507-1515
Published in print October 2005 | ISSN: 0027-8874
Published online October 2005 | e-ISSN: 1460-2105 | DOI: http://dx.doi.org/10.1093/jnci/dji312
Lifetime Risk of Melanoma in CDKN2A Mutation Carriers in a Population-Based Sample

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Background: Germline mutations in the CDKN2A gene have been linked to melanoma incidence in many families with multiple cases of the disease. Previous studies of multiple-case families have indicated that the lifetime risk (i.e., penetrance) of melanoma in CDKN2A mutation carriers is very high, ranging from 58% in Europe to 91% in Australia by age 80 years. In this study, we examined lifetime melanoma risk among CDKN2A mutation carriers using carriers who were identified in a population-based study of melanoma. Methods: Probands for the study were incident case patients with either first or subsequent melanoma who were identified in nine geographic regions in Australia, Canada, the United States, and Italy. A total of 3626 probands (53% participation rate) with adequate DNA for analysis were recruited and genotyped for CDKN2A mutations. From the 3550 probands whose DNA could be amplified by polymerase chain reaction of CDKN2A exons 1α, 2, and 3 and surrounding regions, 65 mutation carriers were identified. Melanoma histories in first-degree relatives of these probands were used to calculate the lifetime risk in CDKN2A mutation carriers using the kin–cohort method. Results: The risk of melanoma in CDKN2A mutation carriers was approximately 14% (95% CI = 8% to 22%) by age 50 years, 24% (95% CI = 15% to 34%) by age 70 years, and 28% (95% CI = 18% to 40%) by age 80 years. Eighteen probands had three or more first-degree relatives with melanoma, but only one was a carrier of a CDKN2A mutation. Conclusions: CDKN2A mutation carriers in the general population have a much lower risk of melanoma than that suggested by estimates obtained from multiple-case families. The preponderance of familial clustering of melanoma occurs in families without identifiable mutations in CDKN2A.

Journal Article.  7917 words.  Illustrated.

Subjects: Medical Oncology

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