The present study was undertaken to determine whether chemoimmunotherapy using activated killer cells is better than chemotherapy alone for cancer patients with peritoneal carcinomatosis. Thirty-one cancer patients received adoptive immunotherapy by activated killer cells and chemotherapy by anticancer drugs selected by a chemosensitivity test (chemoimmunotherapy group), and another 31 cancer patients received chemotherapy (chemotherapy group). The regimen of chemotherapy was determined by the results of a chemosensitivity test in both groups. The clinical effects including response rate and survival were assessed. Five patients (16.1%) achieved complete response (CR), and 17 patients (54.8%) partial response (PR) in the chemoimmunotherapy group (response rate: 22/31 patients = 71.0%), whereas 4 patients (12.9%) achieved CR, and 5 patients (16.1%) PR in the chemotherapy group (response rate: 9/31 patients = 29.0%). The response rate was higher in chemoimmunotherapy group than in chemotherapy group (p<0.05). However, no difference was observed in survival between the two groups. Therefore, it is necessary to develop methods to induce more potent killer cells for adoptive immunotherapy.
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