Denileukin diftitox.

Primary cutaneous T-cell lymphomas (CTCLs) encompass a wide variety of lymphomas that are characterized by the localization of the malignant lymphocytes to the skin at presentation. They are slow-growing and rare, occurring in fewer than 1,000 people annually. Patients may go for months to years with skin abnormalities before being diagnosed. Mycosis fungoides and Sezary syndrome are the most common forms of CTCL and are considered to be indolent diseases. Patients with T1 disease have a normal life expectancy, whereas patients who undergo transformation to large cell lymphoma (8%-23% of patients) have a poor prognosis, with mean survival ranging from 2-19 months.