Abstract
During past 4 years 40 cases of small gastric cancer were treated radically by endoscopic techniques. The endoscopic treatment was classified tree groups, local resection by snare electro-cauterytechnique (mucosal marking-resection method), local tissue coagulation by laser and combined method of resection and coagulation. These resection technique is the best method because it is possible to examine histopathologically through the resected specimen. Whenever possible, a technique which allows the resection of cancerous lesion should be chosen over photocoagulation techniques, photocoagulation is only used to as a primary treatment when partial or total tissue resection is not considered feasible.
Under these application of laser, 1.32μm wavelength of Nd-YAG laser is very useful. The clinical effects of the coagulation properties of 1.32μm wavelength (B-line) compared to the conventional 1.06μm wavelength (A-line) were studied. We obtained the output power of 20 watts in B-line by replacing the laser millors. Three cases of early gastric cancer including a case of IIc type and two cases of IIa type were first treated endoscopically. The biopsies of all cases are negative for cancer during 3 to 6 months after phototherapy. It was observed that in our clinical studies B-line showed more distinguished effects which are limited in the superficial regions. Even if input and output efficiencies are low in B-line, it is useful because of having more strong coagulation and easer to control than A-line in the treatment of mucosal cancer, especially superficial depressed cancer without concern of perforation.
