Photopheresis

• A process in which peripheral blood is exposed in an extracorporeal flow system to photoactivated 8-methoxypsoralen (methoxsalen) and ultraviolet light - a procedure known as puva therapy. Photopheresis is at present a standard therapy for advanced cutaneous T-cell lymphoma; it shows promise in the treatment of autoimmune diseases.
  (Source: The On-line Medical Dictionary)
• A technique for treating cutaneous T-cell lymphoma; after administration of a photoactive chemical, such as methoxsalen, blood is circulated out of the patient, through a source of ultraviolet radiation, and returned. The therapeutic effect is believed to involve stimulation of the host immune system.
  (Source: Dorland's Illustrated Medical Dictionary)

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