The risk of non-melanoma skin cancer in New Zealand in inflammatory bowel disease patients treated with thiopurines

Journal of Gastroenterology and Hepatology
Morwan BahiMichael Schultz

Abstract

New Zealand (NZ) has one of the highest rates of non-melanoma skin cancers (NMSCs) in the world. Thiopurine use in inflammatory bowel disease (IBD) patients has been shown to increase NMSC risk. This study aimed to investigate the possible increase of NMSC risk in thiopurine-treated IBD patients in NZ despite the high background rate. Inflammatory bowel disease patients treated with thiopurines and healthy controls were recruited across two different latitude centers in NZ. Consented participants completed a questionnaire to identify additional risk factors and were examined for suspicious skin lesions. These were photographed, and the pictures were evaluated by a dermatologist. Data were compared between centers and between groups with NMSC incidence and thiopurine-associated relative risks estimated. One hundred seventy-one thiopurine-exposed IBD patients and 201 controls were recruited. Twenty seven of 390 photographs (26 participants) showed suspicious lesions (17 exposed, 9 controls) as determined by the dermatologist. Estimated NMSC incidence was 24.7-34.3/1000 patient-years (thiopurine-exposed, depending on classification of unconfirmed suspicious lesions) and 7-14/1000 patient-years (control). The relative risk of NMSC ...Continue Reading

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