As shown in Supplementary Fig. 1, the expression of PPFIA1 apparently correlated with the RFS, OS, PPS, and DMFS of patients with breast cancer (P < 0.05); the PFS, OS, and PPS of patients with ovarian cancer (P < 0.05); the FP, OS, and PPS of patients with lung cancer (P < 0.05); and the FP, OS, and PPS of patients with gastric cancer (P < 0.05). Here, PPFIA1 is linked to gastric cancer.