Management of imatinib-related exacerbation of psoriasis in a patient with a gastrointestinal stromal tumour.

A 62-year-old woman with a pre-existing psoriasis was treated with oral imatinib (400 mg/day) for a metastatic gastrointestinal stromal tumour. Within 4 weeks of starting therapy, she developed a guttate psoriasis flare. The eruption markedly improved within 2 weeks following cessation of imatinib. However, it recurred when imatinib was recommenced. She has been able to continue on imatinib (400 mg/day) with low-dose oral methotrexate (12.5 mg/week) controlling the psoriasis.