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In recent years photodynamic laser therapy (PDT) has been tested in animal and clinical studies for treatment of esophageal cancer. In several animal experiments a synergistic effect was found by simultaneously applying PDT and hyperthermia (HT). In this paper an optical fibre system is described which can be used in the esophagus for combined PDT with a 1 W dye laser and HT with a 15 W Nd:YAG laser...