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Gastroenterologists at Mayo Clinic in Jacksonville, Fla., report photodynamic therapy (PDT) appears to destroy the abnormal tissue of Barrett's esophagus as well as superficial esophageal cancer. Here's how PDT works. Patients are given an injection of a photosensitizing drug called porfimer sodium (Photofrin). Cells in the body absorb this drug. Normal cells get rid of it, but the drug tends to collect in premalignant and malignant cells.

Tags: Mayo Clinic Jacksonville