ALB and neoplasm: Multivariate logistic regression indicated that previous abdominal surgery (OR = 3.186, 95%CI = 1.212–8.380, p = 0.019), tumor stage (OR = 2.847, 95%CI = 1.196–6.782, p = 0.018), operation time (OR = 1.006, 95%CI = 1.000–1.012, p = 0.036), PG-SGA score (OR = 2.551, 95% CI = 1.207–5.390, p = 0.014), albumin level (OR = 0.830, 95%CI = 0.691–0.997, p = 0.047), and hemoglobin level (OR = 0.978, 95%CI = 0.958–0.999, p = 0.040) were independent risk factors for PPOI (Table 3).