Through the qualitative study of peritoneal cavity free cancer cells of patients with gastric cancer, to evaluate the rational of exercising intraoperative no touch isolation technique, routine peritoneal and warm perfusion chemotherapy after the operation. 102 patients in PLA 309 Hospital with gastric cancer were included into the study. 100 ml peritoneal fluid were collected respectively before the investigation and before close peritoneal cavity,and rapidly sent for free cancer cells examination. Results: Before the investigation, the positive rate of free cancer cells is 36.3%, and the positive rate before close peritoneal cavity is 52.9%. The free cancer cells positive rate is concerned with tumor infiltration depth, serous membrane infection area and the type of the histopathology。Conclusions: Inside the peritoneal cavity of patients with gastric cancer, free cancer cells are able to survive and have a high degree of activity. Although all kinds of intraoperative no touch isolation technique are used, it still cannot be avoided that some cancer cells will exfoliate and slip into the peritoneal cavity. The wound stimulation during the operation will certainly increase the exfoliation. So, it is quite necessary in the course of operation to adopt no touch isolation technique and to use a great deal of normal saline to give peritoneal cavity lavage. And what's more important is, to give these patients who show positive in the free cancer cell examination perfusion chemotherapy after the operation.

To evaluate the effect of intra arterial infusion chemotherapeutic medicine and immunizator in treatment of later gastro intestinal carcinoma, 86 cases suffering from irremovable gastro intestinal carcinoma were divided into treatment group(group A) and control group (group B). 46 cases in group A were treated with intra arterial chemo immunotherapy, 40 cases in group B were treated only with chemotherapy. Effective rates of group A and group B were 82 6% and 52 5% ( P