Flexural Exanthema From Enfortumab Vedotin

Urothelial malignancies are commonly treated with platinum-based therapies. Newer trials have tested antimitotic therapies such as enfortumab vedotin as viable treatment therapy for refractory malignany. Enfortumab vedotin targets nectin-4, a member of a family of calcium-dependent, immunoglobulin-like adhesion molecules found in adherens junctions and expressed in various epithelial malignancies, including bladder, breast, lung, ovarian, head/neck, and esophageal cancers. We present a case of a patient with symmetrical drug-related intertriginous and flexural exanthema secondary to enfortumab. He was successfully treated with topical corticosteroids. Cutaneous toxicity appears to be a common adverse reaction in this growing class of antibody-drug conjugates.