Purpose: Previous studies suggest that solar UV exposure in early life is predictive of cutaneous melanoma risk in adulthood, whereas the relation of BRAF mutation with sun exposure and disease prognosis has been less certain. We investigated the associations between BRAFV600E and NRASQ61R mutations and known risk factors, clinicopathologic characteristics and clinical outcomes of melanoma in a case series of primary invasive cutaneous melanoma from the Nurses’ Health Study (NHS).
Methods: Somatic BRAFV600E and NRASQ61R mutations of 127 primary invasive melanomas from the NHS cohort were determined by pyrosequencing using formalin-fixed, paraffin-embedded block tissues. Logistic regression analyses were performed to detect the associations of mutations with melanoma risk factors, and Kaplan–Meier method was used to examine associations between mutations and survival.
Results: The odds ratios for harboring BRAFV600E mutations were 5.54 (95 % CI 1.19–25.8, ptrend = 0.02) for women residing in states with UV index ≥ 7 versus those residing in states with UV index ≤5 at 30 years of age. Patients with BRAFV600E mutations tended to have shorter melanoma-specific survival when compared to patients with wild type at both loci (median survival time 110 vs. 159 months) (p = 0.03). No association was found between NRASQ61R mutation and melanoma risk factors or melanoma-specific survival.
Conclusions: BRAFV600E mutations in primary cutaneous melanomas were associated with residence in locations with medium and high UV indices in mid-life. BRAFV600E mutation may be associated with an unfavorable prognosis among melanoma patients.
- Sun exposure
ASJC Scopus subject areas
- Cancer Research