A Scandinavian study of survivors of childhood cancer has found a significantly higher incidence of a range of autoimmune disorders compared with matched controls. Using Denmark, Iceland and Sweden’s comprehensive national cancer and hospital episode recording registries 20,361 survivors of cancer diagnosed before the age of 20 were identified. These individuals were matched with 125,794 controls selected from national population registers. The median follow-up was 15 years for survivors and 19 years for controls (range 0-42 years for both).