[Repeated intraperitoneal injection of low-dose CDDP for gastric cancer with ascites owing to peritonitis carcinomatosa].

We attempted treating 5 patients with ascites from peritonitis carcinomatosa of gastric carcinoma using TS-1 as systemic chemotherapy, and repeated intraperitoneal injection of low-dose CDDP for the carcinomatous ascites. TS-1 was administered in the usual manner and repeated intraperitoneal injection of CDDP (10 mg/body) dissolved in physiological saline 20-500 ml was given with an implantable reservoir. In 3 patients, the carcinomatous ascites disappeared, and in 2 other patients they decreased remarkably. As a result, the QOL and PS of all patients were improved. Serum concentration of CDDP suggested that weekly repeated intraperitoneally injected CDDP not only has an effect on peritonitis carcinomatosa, but also functions as a modulator for 5-FU.