MORPHEE : Mechanisms of Cell Death Induced by Extracorporeal Photochemotherapy

This study (MORPHEE) is examining the biological mechanisms by which extracorporeal photochemotherapy (ECP) — a light-based treatment where blood is treated outside the body — causes cancer cells and overactive immune cells to die, to better understand and improve the therapy. **You may be eligible if...** - You are an adult who has been receiving ECP therapy for at least 1 month - You are being treated with ECP for graft-versus-host disease (GVHD) after a transplant, rejection after a solid organ transplant, or a type of skin cancer called cutaneous T-cell lymphoma **You may NOT be eligible if...** - You have limited legal capacity - You are unlikely to follow the study procedures in the investigator's judgment - You have no social security coverage - You are pregnant - You are currently excluded from another trial Talk to your doctor to see if this trial is right for you.