An Ecological Study Indicates the Importance of Ultraviolet A Protection in Sunscreens

Area of Science:

• Dermatology
• Epidemiology
• Public Health

Background:

• Sunscreen use is advised to mitigate sun exposure damage.
• Melanoma incidence varies globally, influenced by factors including sun protection regulations.

Purpose of the Study:

• To investigate the association between sunscreen sales and melanoma incidence.
• To compare these trends in countries with differing sunscreen regulations.

Main Methods:

• Analysis of public data from Sweden, England, Australia, and the USA (1999-2018).
• Utilized generalized estimating equations to assess melanoma incidence and sunscreen sales.
• Employed predictive modeling for future melanoma case projections.

Main Results:

• Melanoma incidence showed a positive association with sunscreen sales in England, Australia, and the USA.
• Sweden exhibited a negative association between melanoma incidence and sunscreen sales.
• Predicted melanoma growth rates: Sweden (0.42%), England (16.7%), Australia (19.1%), USA (12.2%).

Conclusions:

• Discrepancies in melanoma trends correlate with regulatory differences in sunscreen composition.
• Stronger regulations mandating ultraviolet A (UVA) blocking agents may contribute to lower melanoma rates, as observed in Sweden.