Absence of BRAF mutations in UV-protected mucosal melanomas.

Abstract:

BACKGROUND:Mutations in BRAF have recently been identified in a significant percentage of primary and metastatic cutaneous malignant melanomas. As ultraviolet (UV) exposure may play a role in the development of cutaneous melanoma lesions with BRAF mutations, BRAF mutation frequency in melanomas arising in sites protected from sun exposure may be lower than those from sun-exposed areas. Thus, we determined the BRAF mutation frequency in a panel of 13 mucosal melanomas and compared those data with data from all currently published series of cutaneous melanomas. METHODS:BRAF exon 15 DNA from 13 archival primary mucosal melanomas (eight vulvar, four anorectal, and one laryngeal) was sequenced using intron-based primers. As archival DNA occasionally produces poor-quality template, results were confirmed with a TspRI restriction fragment length polymorphism (RFLP) that distinguishes wild-type BRAF from the common mutant form V599E. A binomial test was used to compare the mutation frequency in the mucosal melanomas with the published mutation frequency in cutaneous melanomas. RESULTS:None of the 13 mucosal melanomas in this series had an exon 15 BRAF mutation, as compared to 54/165 (33%) primary cutaneous melanomas with BRAF mutations in a compilation of all current published studies (p = 0.006). DISCUSSION:These data suggest that UV exposure, plays a role in the genesis of BRAF mutations in cutaneous melanoma, despite the absence of the characteristic C>T or CC>TT mutation signature associated with UV exposure, and suggests mechanisms other than pyrimidine dimer formation are important in UV-induced mutagenesis.

journal_name

J Med Genet

authors

Edwards RH,Ward MR,Wu H,Medina CA,Brose MS,Volpe P,Nussen-Lee S,Haupt HM,Martin AM,Herlyn M,Lessin SR,Weber BL

doi

10.1136/jmg.2003.016667

keywords:

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

270-2

issue

4

eissn

0022-2593

issn

1468-6244

journal_volume

41

pub_type

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