Pancreatic-cancer-bearing CCR4−/− mice (tumor implantation n = 22; n = 5 died in <14 days; long-term survivors: n = 3; for statistical analysis: n = 14) benefited from significantly improved survival compared to their wildtype C57BL/6 counterparts (tumor implantation n = 18; n = 3 died in <14 days; long-term survivors: n = 1; for statistical analysis n = 14). This evidence concerns the gene CCR4 and neoplasm.