evidence: For the European Organization for Research and Treatment of Cancer Melanoma Group [...] Philippe Autier, Jean-François Doré, Sylvie Négrier, Danièle Liénard, Renato Panizzon, Ferdy J. Lejeune, David Guggisberg, Alexander M. M. Eggermont, For the European Organization for Research and Treatment of Cancer Melanoma Group, Sunscreen Use and Duration of Sun Exposure: a Double-Blind, Randomized Trial, JNCI: Journal of the National Cancer Institute, Volume 91, Issue 15, 4 August 1999, Pages 1304–1309, https://doi.org/10.1093/jnci/91.15.1304 BACKGROUND: In epidemiologic studies, sunscreen use is associated with increased risk of cutaneous melanoma, basal cell skin cancer, and higher numbers of nevi. It has been proposed that sunscreens may encourage prolonged sun exposure because they delay sunburn occurrence.