Follow-up of participants and their subsequent cancers after non melanoma skin cancer.

1Of 2,725 cases, 82 (3%) had both a BCC and SCC diagnosed within 30 days of the reference date. Of these, oversampling for SCC cases led 79 to an SCC classification.2Participants with cancer of any organ except the skin, diagnosed before the reference date, were excluded from the main analyses. Relative to controls, the odds ratio for a history of non-skin cancer in those with BCC was, adjusted for age, sex and smoking: odds ratio 1.74 (95% CI 1.40, 2.18) and for SCC, OR 1.99 (95% CI 1.59, 2.89).3Total exceeds number of participants with subsequent cancer because a participant may be diagnosed with multiple primary tumors.