Compared with the high OPNI group, the low OPNI group had a greater incidence of: disease type B3 (X2 = 5.354, P = 0.021); preoperative lymphopenia (X2 = 9.864, P = 0.002); decreased preoperative haemoglobin (X2 = 17.341, P = 0.000), prealbumin (X2 = 10.166, P = 0.001), and albumin (X2 = 75.363, P = 0.000); and enteral nutritional intake less than 500 kcal/day within 2 weeks preoperatively (X2 = 20.298, P = 0.000). This evidence concerns the gene TTR and lymphopenia.