POU5F1 and gastric cancer: To predict the relationship between prognosis and the co-expression of OCT4 (POU5F1) and its pseudogenes, we retrieved clinical prognosis data from patients with various types of cancers, including breast, ovarian, lung, and gastric cancers, using the Kaplan-Meier plotter database (Fig. 8 and Supplementary Fig. S4).