Progress of photodynamic therapy in gastric cancer

Progress of photodynamic therapy (PDT) in gastric cancer are described in this paper. 1) We included the whole lesion and a 5-mm margin in the field for irradiation. 2) We established the standard light dose to be 90 J/cm(2) for an argon dye laser and 60 J/cm2 for a pulse wave laser. 3) The size of cancerous lesions curable by PDT was increased by employing a new excimer dye laser model. 4) The depth of cancer invasion which could be treated by PDT was increased from about 4 mm in depth to more than 10 mm in depth. 5) We employed a side-viewing fiberscope for gastric PDT. 6) We developed an endoscopic device for photoradiation in PDT.