• Andrew C Chen, Andrew J Martin, Bonita Choy, Pablo Fernández-Peñas, Robyn A Dalziell, Catriona A McKenzie, Richard A Scolyer, Haryana M Dhillon, Janette L Vardy, Anne Kricker, Gayathri St George, Niranthari Chinniah, Gary M Halliday, and Diona L Damian.
• From the Department of Dermatology and Bosch Institute (A.C.C., R.A.D., G.M.H., D.L.D.) and the Department of Tissue Pathology and Diagnostic Oncology (C.A.M., R.A.S.), University of Sydney at Royal Prince Alfred Hospital, National Health and Medical Research Council Clinical Trials Center (A.J.M.), Central Clinical School (A.C.C., R.A.S., G.M.H., D.L.D.) and Concord Clinical School (J.L.V.), Sydney Medical School, Center for Medical Psychology and Evidence-Based Decision-Making (H.M.D., J.L.V.), and Sydney School of Public Health (A.K.), University of Sydney, Melanoma Institute Australia, North Sydney (R.A.S., D.L.D.), the Department of Dermatology, University of Sydney at Westmead Hospital (B.C., P.F.-P., G.S.G., N.C.), and Concord Repatriation General Hospital (J.L.V.) - all in Sydney.
• N. Engl. J. Med. 2015 Oct 22;373(17):1618-26.

BackgroundNonmelanoma skin cancers, such as basal-cell carcinoma and squamous-cell carcinoma, are common cancers that are caused principally by ultraviolet (UV) radiation. Nicotinamide (vitamin B3) has been shown to have protective effects against damage caused by UV radiation and to reduce the rate of new premalignant actinic keratoses.MethodsIn this phase 3, double-blind, randomized, controlled trial, we randomly assigned, in a 1:1 ratio, 386 participants who had had at least two nonmelanoma skin cancers in the previous 5 years to receive 500 mg of nicotinamide twice daily or placebo for 12 months. Participants were evaluated by dermatologists at 3-month intervals for 18 months. The primary end point was the number of new nonmelanoma skin cancers (i.e., basal-cell carcinomas plus squamous-cell carcinomas) during the 12-month intervention period. Secondary end points included the number of new squamous-cell carcinomas and basal-cell carcinomas and the number of actinic keratoses during the 12-month intervention period, the number of nonmelanoma skin cancers in the 6-month postintervention period, and the safety of nicotinamide.ResultsAt 12 months, the rate of new nonmelanoma skin cancers was lower by 23% (95% confidence interval [CI], 4 to 38) in the nicotinamide group than in the placebo group (P=0.02). Similar differences were found between the nicotinamide group and the placebo group with respect to new basal-cell carcinomas (20% [95% CI, -6 to 39] lower rate with nicotinamide, P=0.12) and new squamous-cell carcinomas (30% [95% CI, 0 to 51] lower rate, P=0.05). The number of actinic keratoses was 11% lower in the nicotinamide group than in the placebo group at 3 months (P=0.01), 14% lower at 6 months (P<0.001), 20% lower at 9 months (P<0.001), and 13% lower at 12 months (P=0.001). No noteworthy between-group differences were found with respect to the number or types of adverse events during the 12-month intervention period, and there was no evidence of benefit after nicotinamide was discontinued.ConclusionsOral nicotinamide was safe and effective in reducing the rates of new nonmelanoma skin cancers and actinic keratoses in high-risk patients. (Funded by the National Health and Medical Research Council; ONTRAC Australian New Zealand Clinical Trials Registry number, ACTRN12612000625875.).

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