On day 35 post-inoculation, the tumor size in Ccr1−/−Cxcr2−/− > WT mice was 794 ± 104 mm3, whereas those in WT > WT, Ccr1−/−>WT and Cxcr2−/− > WT mice were 2198 ± 525 mm3, 1243 ± 352 mm3 and 1188 ± 246 mm3 (P < 0.05, <0.05 and <0.05, respectively: Fig. 6b and Supplementary Fig. 4b). The gene discussed is CCR1; the disease is neoplasm.