GPX1 and gastric cancer: Using the GEPIA database [18] (GEPIA, http://gepia.cancer-pku.cn/), the mRNA expression levels of GPx2 and GPx1 in gastric cancer tissues and adjacent normal tissues were examined (Fig. 1A, B); GPx2 was overexpressed in GC tissues compared with adjacent normal tissues (P < 0.01), while there was no significant difference in GPx1 expression.