Although in TC-1- and TC-1/dIfngr1-induced tumors, IFN-γ had an anti-tumor effect and in TC-1/A9-induced tumors, it did not markedly affect tumor growth, this cytokine supported the growth of TC-1/A9/dIfngr1-induced tumors, which was mediated by non-tumor cells sensitive to IFN-γ. The gene discussed is IFNG; the disease is neoplasm.