ID Of Prognostic Factors In Mycosis Fungoides/Sezary Syndrome

Inclusion Criteria * Diagnosis of advanced stage MF or SS (Stages IIB - IVB) within 6 months of presentation to the participating center * Patients that are expected to have care administered at the participating center or jointly with referring physician(s) where follow-up data would be available Exclusion Criteria * Patients diagnosed with early stage MF/SS (Stages IA-IIA) before progressing to advanced stage * Patients diagnosed with advanced MF/SS more than 6 months prior to initial presentation to the participating center * Exclude one-time consultation type of new patients.