The results showed that in LTBP2-silenced gastric cancer cells, the intracellular productions of ROS, MDA, and MSSG were decreased after coculture with NK-252 (Figures 6(a)–6(c) and 6(e)), while the productions of GSH and GPX4 were increased correspondingly (Figures 6(d) and 6(f)). This evidence concerns the gene GPX4 and gastric cancer.