Abstract

The effect of a synthetic thymic hormone, THF-γ2, on the anti-tumor activity of spleen cells was studied in mice immunized against the RPC-5 tumor. Following two courses of the THF-γ2 treatment, the mean RPC-5 specific cytotoxic response of immune spleen cells was significantly increased when compared to normal cells ( P<0.001) and to untreated immune spleen cells ( P<0.04). In addition, THF-γ2 treatment improved the competence of immune spleen cells in adoptive immunotherapy (AIT) when performed in combination with chemotherapy by melphalan. Recipients of spleen cells from THF-γ2 treated mice showed a 35% increase in survival when compared to AIT with immune cells alone. The results suggest that THF-γ2 treatment of donors for AIT might be applicable to cancer therapy in humans.

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