ID Of Prognostic Factors In Mycosis Fungoides/Sezary Syndrome

This study is identifying which factors predict outcomes in patients with advanced mycosis fungoides or Sézary syndrome — rare types of blood cancer that mainly affect the skin — to improve how doctors manage and treat these conditions. **You may be eligible if...** - You have been diagnosed with advanced mycosis fungoides or Sézary syndrome at stages IIB through IVB - You were diagnosed within 6 months of first coming to the participating center - Your care is expected to be provided at or coordinated with the participating center so that follow-up data can be collected **You may NOT be eligible if...** - You had early-stage disease before progressing to advanced stage and were diagnosed at that early stage at another center - You were diagnosed more than 6 months before your first visit to the participating center - You are only coming for a single one-time consultation Talk to your doctor to see if this trial is right for you.