A Randomized, 12-Year Primary-Prevention Trial of Beta Carotene Supplementation for Nonmelanoma Skin Cancer in the Physicians' Health Study

Abstract
BASAL CELL carcinoma (BCC) and squamous cell carcinoma (SCC), usually referred to as nonmelanoma skin cancer (NMSC), are the most common malignant neoplasms among white patients. Worldwide, including in the United States, the incidence of NMSC is increasing.1,2 Although NMSC has an extremely low case fatality rate, it is a major cause of morbidity, including notable disfigurement, particularly as most lesions occur on the face, head, or neck.3