Furthermore, we explored the prognostic value of PTPN1 in several types of cancer in the Kaplan-Meier Plotter database and found that PTPN1 was significantly associated with poor OS and post-progression survival (PPS) of patients with ovarian cancer, as well as poor OS, first progression (FP), and PPS of patients with lung cancer, and poor OS and PPS of patients with gastric cancer. This evidence concerns the gene PTPN1 and gastric cancer.