Addition of PBMC stimulated with IL-2 (Fig. 5 b) or addition of NK cells (Fig. 5 c) resulted in an even higher cytotoxicity on the addressed sarcoma cells, whereby the cytotoxic effect again was significantly stronger on MeV-infected A673 cells (Fig. 5 b, c, right panel) than on mock-infected cells (Fig. 5b, c, left panel). This evidence concerns the gene IL2 and sarcoma.