GPX4 and neoplasm: Bioinformatic analysis of 408 tumor tissues from patients with gastric adenocarcinoma and 211 tissue samples from non-tumor diseases in the online database GEPIA (http://gepia.cancer-pku.cn/)) showed that the transcript copy numbers of TET1, TET2, GPX4, and SLC7A11 in tumor tissues were significantly higher than those in the normal tissues (Figure 6A).