Survival from transformation in MF/SS according to clinical T category at transformation (Kaplan-Meier). T2, more than 10% of skin surface involved by plaque (8 patients); T3, cutaneous tumors (13 patients); T4, erythroderma (5 patients). There were no patients with clinical T1 category. A P value (shown) was determined by the Gehan-Wilcoxon test. Tick marks indicate points at which there are 1 or more patients who are still alive at the time of the analysis. (○) Patients who have died.