A patient with non-small cell lung carcinoma and recent radiotherapy for brain metastases developed toxic epidermal necrolysis (TEN) shortly after therapy with phenytoin was initiated for a seizure. Exfoliation progressed to involve 90% of her body surface despite treatment with high-dose corticosteroids for 5 days, but sloughing and systemic toxicity ceased within 2 days of initiating therapy with intravenous cyclophosphamide (300 mg/day). Reepithelialization rapidly followed. This experience and the reports of others suggest that intravenous cyclophosphamide is helpful in the treatment of TEN.
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