Registry of the German CLL Study Group

This study is building a national registry in Germany to track patients with chronic lymphocytic leukemia (CLL) and related blood cancers over time, collecting information about diagnosis, treatment choices, and outcomes to improve future care. **You may be eligible if...** - You are 18 or older with a confirmed diagnosis of CLL, B-cell or T-cell prolymphocytic leukemia, small lymphocytic lymphoma, large granular lymphocyte leukemia, hairy cell leukemia, or Richter's transformation (a rare aggressive change in CLL) - You are newly diagnosed and being watched without treatment, on standard therapy, being evaluated for a stem cell transplant, or have relapsed disease - You have signed a written informed consent form **You may NOT be eligible if...** - Your diagnosis has not been confirmed by appropriate testing - You are under 18 years old Talk to your doctor to see if this trial is right for you.