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The molecular mechanisms of tumor invasion and metastasis are yet to be fully elucidated. A potential tumor‐metastasis‐suppressor gene nm23 has been described in certain rodent and human tumors. In the present study, we examined the potential anti‐invasive and anti‐metastatic effect of nm23 gene in B16F10 cells, a malignant murine melanoma cell line. Transfection of nm23 gene into B16F10 melanoma ceils resulted in significant suppression of the invasiveness and metastatic ability of melanoma cells and significantly enhanced the survival of tumor‐bearing mice. B16F10 melanoma cells transfected with nm23 produced significantly less soluble ICAM‐I and were more susceptible to LAK‐cell‐mediated cytotoxicity. Co‐culture of B16F10 melanoma cells with IL‐2 had no effect on nm23 expression, whereas treatment with PGE₂, TNF‐α and IFN‐γ resulted in down‐regulation of nm23 expression …