An allogeneic cancer vaccine composed of lethally irradiated, whole pancreatic cancer cells transfected with a plasmid carrying the gene for cytokine granulocyte-macrophage colony-stimulating factor (GM-CSF), with potential immunostimulating and antineoplastic activities. Allogeneic GM-CSF-secreting tumor vaccine PANC 6.03 pcDNA-1/GM-Neo secretes GM-CSF thereby activating dendritic cells, promoting antigen presentation to B- and T-cells, and promoting a cytotoxic T-lymphocyte (CTL) response. This may eventually kill tumor cells. The pancreatic tumor cells are derived from the PANC 6.03 tumor cell line.