A cancer vaccine derived from two gentically modified human melanoma cell lines with potential antineoplastic activity. Allogeneic melanoma vaccine AGI-101H consists of a 1:1 mixture of cells from two genetically modified human melanoma cell lines, designated as Mich1H6 and Mich2H6, that have been gamma-irradiated to render the cells non-proliferative. Upon administration, this vaccine may stimulate a cytotoxic immune response against melanoma tumor cells.