In the univariate analyses, previous abdominal surgery (p = 0.034), tumor stage (p = 0.001), operation time (p = 0.004), PG-SGA (p < 0.001), NRS2002 score ≥ 3 (p = 0.011), total protein level (p = 0.010), albumin level (p < 0.001), prealbumin level (p < 0.001), cholinesterase level (p = 0.001), hemoglobin level (p < 0.001) and lymphocyte count (p = 0.026) were associated with PPOI (Table 2). This evidence concerns the gene ALB and neoplasm.