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Nevi are a risk factor for melanoma, and the number in an individual grows with increasing ultraviolet radiation. Investigators asked whether the number of nevi might also forecast a predisposition to basal cell carcinoma (BCC).
The researchers recorded the number of nevi on the forearms and hands of volunteers from Queensland, Australia, in 1986, and the number on the backs of the same individuals in 1992. The subjects were followed prospectively for the development of new BCCs from 1992 through 2007. A total of 1339 individuals were evaluated for the duration of the study or until they died. In all, 1202 histologically confirmed BCCs were diagnosed in 401 subjects. Patients with nevi on the forearms and hands were more likely to develop BC…