Solar considerations in the development of cutaneous melanoma

Area of Science:

• Dermatology and Environmental Health
• Photobiology
• Epidemiology

Background:

• Melanoma development is influenced by solar radiation, but the specific wavelengths responsible remain debated.
• Previous research has considered various parts of the solar spectrum, including ultraviolet (UV), visible, and near-infrared (NIR) radiation.
• Epidemiological data and physical considerations are crucial for identifying the action spectrum of melanoma.

Purpose of the Study:

• To narrow down the possible action spectrum for melanoma by evaluating different solar radiation bands.
• To investigate the potential role of UV, visible, and NIR radiation in melanoma development.
• To assess the utility of altitude as a discriminating variable in epidemiological studies of melanoma.

Main Methods:

• Analysis of physical factors and epidemiological data to evaluate potential solar agents for melanoma.
• Comparison of the energy and flux of different radiation types (UV-C, UV-B, UV-A, visible, NIR).
• Consideration of altitude's effect on light transmission and its correlation with melanoma incidence.

Main Results:

• Ionizing radiation is unlikely to be the primary cause of melanoma.
• UV, visible, and NIR radiation are plausible candidates, with UV-B, UV-A, visible, and NIR all having potential roles.
• Altitude's differential effect on light transmission suggests it could be a key factor if UV radiation is implicated.

Conclusions:

• The action spectrum for melanoma is broad and not limited to a single solar emission band.
• UV radiation, particularly UV-B, is a strong candidate, but UV-A, visible, and NIR cannot be excluded.
• Altitude-dependent epidemiological studies are essential to further elucidate the role of different solar wavelengths in melanoma causation.