IL6 and gastric cancer: Subgroup analysis based on country showed that, in Chinese and Japanese GC patients, postoperative serum IL-6 levels in LAG group were significantly lower than OG group (Japanese: SMD = −1.19, 95% CI = −1.81 ~ −0.57, P < 0.001; Chinese: SMD = −2.78, 95% CI = −4.21 −1.36, P < 0.001).