Abstract
Polysaccharide K (PSK) is widely used in Japan as a biological response modifier for cancer patients. We investigated the effects of PSK with S-1 based chemotherapy for advanced gastric cancer patients in immune response. Nine advanced gastric cancer patients who underwent chemotherapy at the University of Tokushima were included in this study. In all patients, 3g PSK was received orally and S-1 based chemotherapy for 2 weeks alternately for 8 weeks. Serial changes in immunological parameters (Foxp3, Natural killer (NK), CD4/CD8) were monitored. The levels of Foxp3 at 8 weeks was significantly decreased compared with 2 weeks (4.26% vs. 3.11%). In NK activity at 8 weeks was significantly increased compared with 2 weeks (27% vs. 47%). These results of this study suggested that chemotherapy with PSK improved the immune response in advanced gastric cancer patients. Especially Foxp3 was concerned in this mechanism.
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