Association of 25-hydroxyvitamin D levels and cutaneous melanoma: A nested case-control study of the Women's Health Initiative Observation Study

To the Editor: Exposure to ultraviolet radiation is an important risk factor for melanoma but is also the principal means by which the body synthesizes vitamin D in the skin. Prior studies on the association between 25-OH-D levels and melanoma occurrence and prognosis have shown conflicting results.1,2