Blood irradiation therapy

Blood irradiation therapy, often referred to as photopheresis or extracorporeal photopheresis (ECP), is a medical treatment used primarily for certain hematologic conditions, including cutaneous T-cell lymphoma (CTCL) and graft-versus-host disease (GVHD). The therapy involves the collection of a patient's blood, which is then treated with a photosensitizing agent, most commonly 8-methoxypsoralen (8-MOP).