Abstract
The transfer of certain cytokine genes into cancer cells can provide very powerful suppression of tumor growth in the absence of any toxic side effects. Some of these cytokines, such as interleukin-4, granulocyte colony-stimulating factor and tumor necrosis factor, can mediate powerful immune supression even in T-cell-deficient animals and appear to be effective for poorly or non-antigenic tumors. However, approaches must be found to induce or deliver cytokines locally at the tumor site.
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