Study links widely-used drug azathioprine to skin cancers
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A drug used to treat inflammatory bowel disease, arthritis and vasculitis as well as to prevent organ rejection in transplant patients has been identified as an important contributor to skin cancer development, in a research study carried out at the University of Dundee, Queen Mary University of London and the Wellcome Sanger Institute.

The research, published in Nature Communications, identified a `strong case for an association’ between the drug azathioprine and the mutational signature found in cases of cutaneous squamous cell carcinoma (cSCC), a common form of skin cancer.

It was already known that use of azathioprine leads to increased photosensitivity to UVA light, probably contributing to development of skin cancers. This new study finds that use of azathioprine leaves a molecular fingerprint in skin cancers, further implicating it in cSCC development.

Charlotte Proby, Professor of Dermatology in the School of Medicine at Dundee, said, “We recommend all physicians give appropriate advice on UVA avoidance including year-round sun protection for their patients on azathioprine.”

Professor Proby and colleagues said they were not necessarily advocating withdrawal of azathioprine.

“As with all medications the risks must be balanced against the benefits, particularly with the need to treat potentially life-threatening diseases with

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