Abstract
We have studied experimentally and clinically to evaluate the efficacy and safety of the endoscopic VAG laser therapy, and those of the contact type of optical fiber (micro-tip) for the tumors in the gastrointestinal tract. 2 cases of superficial esophageal cancer, 7 cases of early gastric cancer, 22 cases of gastric adenoma, 6 cases of advanced cancer in the esophagus, stomach and colon with stenosis and bleeding were treated with Nd-YAG laser (Medilas). The micro-tip is made of Al2O3 and durable, and then able to treat under half of the exposure power less than those of quartz fiber. 5 cases out of 24 cases (15.6%) treated with quartz fiber were appeared residual tumor in course of endoscopic follow-up. The contact laser treatment is possible to cure accurately than the non-contact radiation.
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