A Retrospective Clinical Study on the First-line Maintenance Treatment of PTCL With Chidamide.

This is a retrospective study — meaning researchers are looking back at existing medical records — to understand how well a drug called chidamide works as a maintenance treatment (ongoing treatment to prevent relapse) for a type of blood cancer called peripheral T-cell lymphoma (PTCL). PTCL is a rare and aggressive type of lymphoma. Maintenance therapy is given after the main treatment to help keep the cancer from coming back. **You may be eligible if...** - You are 18 years or older - You have been diagnosed with peripheral T-cell lymphoma (PTCL) - You received chidamide as a maintenance therapy after your first round of cancer treatment - You are willing to have your past medical records reviewed **You may NOT be eligible if...** - You have a different type of lymphoma (not PTCL) - You are pregnant Talk to your doctor to see if this trial is right for you.