Mouse melanoma tumor cells incubated with the CXCR3 ligand, CXCL9, exhibited greater viability than the control cells (Table 1), thus demonstrating that CXCR3 imparts a selective advantage to tumor cells most likely allowing them to compete more effectively for oxygen and nutrient availability in the competitive tumor microenvironment (60–62). The gene discussed is CXCL9; the disease is melanoma.