TY - JOUR KW - Adult KW - Female KW - Humans KW - Aged KW - Male KW - Middle Aged KW - United States KW - Australia KW - Genotype KW - GTP Phosphohydrolases KW - Melanoma KW - Membrane Proteins KW - Mutation KW - Phenotype KW - Proto-Oncogene Proteins B-raf KW - Receptor, Melanocortin, Type 1 KW - Skin Neoplasms AU - Group GEM AU - Dwyer T AU - Thomas Nancy AU - Edmiston Sharon AU - Kanetsky Peter AU - Busam Klaus AU - Kricker Anne AU - Armstrong Bruce AU - Cust Anne AU - Anton-Culver Hoda AU - Gruber Stephen AU - Luo Li AU - Orlow Irene AU - Reiner Anne AU - Gallagher Richard AU - Zanetti Roberto AU - Rosso Stefano AU - Sacchetto Lidia AU - Parrish Eloise AU - Hao Honglin AU - Gibbs David AU - Frank Jill AU - Ollila David AU - Begg Colin AU - Berwick Marianne AU - Conway Kathleen AB -

Associations of MC1R with BRAF mutations in melanoma have been inconsistent between studies. We sought to determine for 1,227 participants in the international population-based Genes, Environment, and Melanoma (GEM) study whether MC1R and phenotypes were associated with melanoma BRAF/NRAS subtypes. We used logistic regression adjusted by age, sex, and study design features and examined effect modifications. BRAFwere associated with younger age, blond/light brown hair, increased nevi, and less freckling, and NRASwith older age relative to the wild type (BRAF/NRAS) melanomas (all P < 0.05). Comparing specific BRAF subtypes to the wild type, BRAF V600E was associated with younger age, blond/light brown hair, and increased nevi and V600K with increased nevi and less freckling (all P < 0.05). MC1R was positively associated with BRAF V600E cases but only among individuals with darker phototypes or darker hair (P< 0.05) but inversely associated with BRAF V600K (P = 0.006) with no significant effect modification by phenotypes. These results support distinct etiologies for BRAF V600E, BRAF V600K, NRAS, and wild-type melanomas. MC1R's associations with BRAF V600E cases limited to individuals with darker phenotypes indicate that MC1R genotypes specifically provide information about BRAF V600E melanoma risk in those not considered high risk based on phenotype. Our results also suggest that melanin pathways deserve further study in BRAF V600E melanomagenesis.

BT - J Invest Dermatol C1 - https://www.ncbi.nlm.nih.gov/pubmed/28842324?dopt=Abstract DO - 10.1016/j.jid.2017.07.832 IS - 12 J2 - J. Invest. Dermatol. LA - eng N2 -

Associations of MC1R with BRAF mutations in melanoma have been inconsistent between studies. We sought to determine for 1,227 participants in the international population-based Genes, Environment, and Melanoma (GEM) study whether MC1R and phenotypes were associated with melanoma BRAF/NRAS subtypes. We used logistic regression adjusted by age, sex, and study design features and examined effect modifications. BRAFwere associated with younger age, blond/light brown hair, increased nevi, and less freckling, and NRASwith older age relative to the wild type (BRAF/NRAS) melanomas (all P < 0.05). Comparing specific BRAF subtypes to the wild type, BRAF V600E was associated with younger age, blond/light brown hair, and increased nevi and V600K with increased nevi and less freckling (all P < 0.05). MC1R was positively associated with BRAF V600E cases but only among individuals with darker phototypes or darker hair (P< 0.05) but inversely associated with BRAF V600K (P = 0.006) with no significant effect modification by phenotypes. These results support distinct etiologies for BRAF V600E, BRAF V600K, NRAS, and wild-type melanomas. MC1R's associations with BRAF V600E cases limited to individuals with darker phenotypes indicate that MC1R genotypes specifically provide information about BRAF V600E melanoma risk in those not considered high risk based on phenotype. Our results also suggest that melanin pathways deserve further study in BRAF V600E melanomagenesis.

PY - 2017 SP - 2588 EP - 2598 T2 - J Invest Dermatol TI - Associations of MC1R Genotype and Patient Phenotypes with BRAF and NRAS Mutations in Melanoma. VL - 137 SN - 1523-1747 ER -