ObjectiveTo evaluate the value of omega-3 fish oil fat emulsion in parenteral nutrition support after radical resection of gastric cancer patients.MethodsThe clinical data of 80 patients in Tongling Peopl’s Hospital undergoing radical resection of gastric cancer from March 2018 to September 2019 were enrolled by retrospective method. Of them, 40 patients were treated with routine parenteral nutrition (control group) and 40 patients were treated with extra 100 mL omega-3 fish oil fat emulsion after operation (observation group). Nutritional and stress indicators included blood total albumin (TP), albumin (ALB), c-reactive protein (CRP), and procalcitonin (PCT) on one day before operation, and 1st, 3rd, and 7th day after operation were collected. The collected indexes of liver function included blood cholesterol (CHO), triglyceride (TG), total bilirubin (TBIL), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and gamma glutamyl transpeptidase (γ-GT) on one day before operation, and 3rd and 7th days after operation.Results① Nutritional indicator. There was no significant differences in TP and ALB levels between the two groups on one day before operation, and on the 1st, 3rd, and 7th day after operation (P>0.05). In the same group compared with one day before operation, the average TP level of the control group and the observation group decreased on the 1st, 3rd, and 7th day after operation (P<0.05), and in the control group and the observation group, the ALB level decreased on the 1st day after operation (P<0.05), and increased on the 7th day after operation (P<0.05). ② Stress index. There was no significant difference in CRP and PCT levels between the two groups on one day before and one day after operation (P>0.05), and the CRP and PCT levels in the observation group were lower than those in the control group on the 3rd day and 7th day after operation (P<0.05). Compared with the CRP and PCT levels on the one day before operation, the average CRP and PCT levels in the observation group and the control group increased on the 1st, 3rd, and 7th day after operation (P<0.05). ③ Liver function index. There was no significant differences in CHO, TG, and γ-GT levels between the two groups on one day before operation and the 3rd day after operation (P>0.05), but the above indexes of observation group were lower on the 7th day after operation than those of the control group (P<0.05). There was no significant differences on TBIL, ALT, and ALP levels between the postoperative observation group and the control group (P>0.05). Compared with one day before operation in the same group, there was no significant difference on CHO and ALP levels on 3rd and 7th day after operation in both the observation group and control group (P>0.05). There was no significant differences in TG and TBIL levels in the observation group on 3rd and 7th day after operation (P>0.05), but the TG and TBIL levels in the control group were increased on 7th after operation (P<0.05), and the ALT and γ-GT levels in the observation group and the control group on 7th day after operation were increased in the same group compared with one day before operation (P<0.05).ConclusionParenteral nutrition with omega-3 fish oil fat emulsion do not improve the recent postoperative nutritional status, but reduce the inflammatory stress response and protecte liver function in patients with gastric cancer after operation.