[Augmentation of the anti-tumor activity of regional lymph node lymphocytes and spleen cells of tumor-bearing mice by culture with T cell growth factor in vitro--a comparison of the intestinal cancer model and footpad cancer model].

The anti-tumor activity of regional lymph node lymphocytes (RLNL) of DS mice bearing syngeneic carcinoma SC42 was observed both in intestinal cancer model and in footpad cancer model, while neither spleen cells (SPLC) nor distant lymph node lymphocytes showed any activity in Winn's tumor neutralizing test. This anti-tumor activity of RLNL was tumor specific examining between SC42 and SC115. RLNL in both cancer models did not show any cytotoxic activity against SC42 measured by 51Cr release test. However, after 9 days of culture with lectin-free T cell growth factor (LF-TCGF), the cytotoxic activity against SC42 of RLNL was induced in both cancer models. Cultured SPLC showed the cytotoxic activity against SC42 only in intestinal cancer model. Any lymphocytes from normal mice showed no cytotoxic activity against SC42 after culture with LF-TCGF. Moreover, the cytotoxic activity of cultured RLNL was tumor specific between SC42 and SC115, while that of cultured SPLC was non-specific. These results indicated that RLNL was immunologically important in tumor bearing host and the immunological significance of spleen was different between intestinal cancer and cancer of other sites.