Preventing skin cancer with nicotinamide in transplant patients
The purpose of this study is to determine whether an oral vitamin called nicotinamide can help prevent skin cancer in 396 high-risk kidney, liver, heart and lung transplant recipients. Participants will be involved in the study for four years and will visit the study doctor or clinical research staff every 17 weeks. Participants will receive nicotinamide or a placebo, taken orally for the entire follow-up period, which will last up to 208 weeks.