CXCR1 and gastric cancer: In discovery data set, it turned out that CXCR1 expression, together with TNM stage, was identified as one of the two independent prognosticators for resectable gastric cancer patients’ OS (P = 0.001, HR: 2.32, 95% CI: 1.39-3.89 and P < 0.001, HR: 2.22, 95% CI: 1.48-3.32, Figure 2D), which was validated in the validation data set (P = 0.01, HR: 1.84, 95% CI: 1.16-2.93 and P < 0.001, HR: 2.47, 95% CI: 1.65-3.70, Figure 3B).