Remission of psoriasis after treatment with interferon-alfa and 2-chlordeoxyadenosine for hairy cell leukemia.

2-Chlordeoxyadenosine (2-CdA) is an antineoplastic/immunosuppressive agent used to treat hairy cell leukemia (HCL), chronic lymphocytic leukemia, and low-grade lymphomas. Its immunomodulatory properties, however, may allow its future use in the treatment of psoriasis. We report a patient with psoriasis and HCL who was treated for 1 week with continuous intravenous infusion of 2-CdA for recurring HCL. Both the psoriasis and the HCL cleared. Four years after 2-CdA treatment, the patient has psoriasis on only 1% of his body surface area. 2-CdA induces lymphocytopenia, which may explain the improvement in this patient's psoriasis.