Patent ID: 6821289
Filing Date: 2004-11-23
Classification: A61N,A61P

Abstract:
A safer, improved, photodynamic-therapeutic method of treatment of hyperproliferative diseased tissue, including cancers, psoriasis, and arthritis, comprising the steps of:a. administering a preselected dose of a photosensitizer formulation, wherein said photosensitizer is taken up by said hyperproliferative diseased tissue at a treatment site and preferentially retained in said diseased tissue over normal, healthy tissue; b. waiting a first preselected amount of time to allow said photosensitizer to return to a basal value in normal tissue while remaining elevated in said diseased tissue; c. administering at least one additional dose of said photosensitizer to said treatment site after said preselected first amount of time, wherein another preselected amount of time elapses between each additional dose to permit reduction of a concentration of said photosensitizer to a basal value in normal tissue; and d. irradiating said treatment site after an additional period of time has elapsed after the finally administered dose.