GSTM1 and neoplasm: The univariate Cox regression model revealed that BMI < 18.5 kg/m2, PSS 2–3, history of chemotherapy, postoperative CCR2–4, PCI > 20, tumor grade 3–4, preoperative Hb levels, and postoperative Hb levels of 81–90 and 91–100 g/L were significantly associated with postoperative OS in patients with PMP (all P < 0.05, Table 2).