In June 2018 researchers from Poland and Italy published a review of the scientific literature relating to both caffeinated and decaffeinated coffee consumption and the risk of melanoma. A total of 7 studies were included in the analysis, and involved 1,418,779 participants and 9,211 cases of melanoma. Results showed that coffee consumption appeared to reduce the risk of melanoma. In fact, an increase in coffee consumption of one cup per day appeared to be associated with a 3% reduction in melanoma risk.
Micek A et al. Caffeinated and decaffeinated coffee consumption and melanoma risk: a dose-response meta-analysis of prospective cohort studies. Int J Food Sci Nutr. 2018; 69:417-426.