photopheresis

photopheresis
pho·to·phe·re·sis -fə-'rē-səs n a method of treating disease (as certain lymphomas) esp. of T cell origin that involves pretreating blood in the living patient by administering a photoactive drug (as methoxalen), obtaining a fraction rich in white blood cells, exposing the fraction to damaging ultraviolet radiation, and returning it to the body where it stimulates a therapeutic immunological response

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pho·to·phe·re·sis (fo″to-fə-reґsis) [photo- + pheresis] 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.

Medical dictionary. 2011.

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