Solar elastosis and cutaneous melanoma: a site-specific analysis.

Area of Science:

• Dermatology
• Epidemiology
• Oncology

Background:

• Cutaneous melanomas (skin cancers) develop via "chronic sun exposure" or "nevus" pathways.
• The role of sun exposure in non-head/neck melanoma development is not fully understood.

Purpose of the Study:

• To investigate the prevalence and risk factors for chronic solar damage in skin adjacent to invasive melanomas.
• To compare trunk and head/neck melanomas regarding solar damage and associated factors.

Main Methods:

• A population-based, case-control study in Brisbane, Australia (2007-2010).
• Inclusion of 418 trunk and 92 head/neck melanoma patients (aged 18-79).
• Assessment of solar elastosis (sun damage) by dermatopathologists and collection of patient-reported data on sun exposure, phenotype, and nevi.

Main Results:

• Moderate-to-marked solar elastosis was found in 37% of trunk melanomas and 77% of head/neck melanomas.
• For trunk melanomas, elastosis correlated with age, sun exposure, facial freckling, and inversely with tanning ability and nevus count.
• Similar associations were observed for moderate solar elastosis, indicating distinct risk profiles.

Conclusions:

• Approximately one-third of trunk melanomas in Queensland show evidence of significant sun damage.
• Trunk melanomas with solar damage exhibit different risk factor associations compared to those without.
• Findings highlight the importance of sun exposure in the etiology of trunk melanomas.