A case report of photo dynamic therapy (PDT) using a pulsed gold vapor laser was described. Hematoporphyrin derivative (HpD, 3mg/kg) was used as a photosensitizer. Patient was a 72 y.o. male and he has a lesion of early gastric cancer. Power of PDT was 330mW and total energy was set to be 160J /cm2(2.5cm2) and 132J/cm2(1.5cm2). Resection surgery was carried out after PDT. Pathological examination of the resected stomach revealed that the PDT effect to the tissue was extended to the muscle layer. This case suggects that a gold vapor laser is effective in the treatment of gastrointestinal cancer.
