PF4 and cancer: The level of PDGF (AUC: 0.856, 95% CI: 0.771–0.940), PF4 (AUC: 0.735, 95% CI: 0.612–0.859), VEGF (AUC: 0.789, 95% CI: 0.694–0.884), and TGF-β1 (AUC: 0.763, 95% CI: 0.658–0.868) in PP is significantly different between the cancer groups and control groups (Table 4).