Abstract:Objective To investigate the correlation between preoperative albumin to alkaline phosphatase ratio (AAPR)combined with systemic inflammatory response index (SIRI) and the clinicopathological characteristics and prognosis of patients with radically resected gastric cancer. Methods A total of 241 patients admitted to the Department of Gastrointestinal Surgery of the Affiliated Hospital of Guangdong Medical University for radical gastric cancer treatment during the period of August 2018 to December 2020 were selected. The clinical data of the patients were collected, and the values of the AAPR and the SIRI were calculated. The optimal cut-off points for AAPR and SIRI were determined by ROC curves. The AAPR-SIRI score was constructed by combining the two indexes, and the relationship between the AAPR-SIRI score and the pathological characteristics of gastric cancer was analyzed by the χ2 test; the survival curve was depicted by the Kaplan-Meier method; and unifactorial and multifactorial analyses were carried out by the Cox proportional hazards regression model. Results (1) The AAPR-SIRI scores of the 0, 1, and 2 groups showed statistically significant differences in tumor diameter, TNM stage, presence or absence of nerve invasion, presence or absence of choroidal cancer embolism, and survival time when compared between groups (P<0.05). The patients with high scores may have larger tumor diameters, later TNM stages, easier invasion of nerves and vessels, and shorter survival times. (2) Survival analysis showed that the three-year survival rates of AAPR-SIRI subgroups 0, 1, and 2 were 81.08%, 57.47%, and 41.25%, respectively, and the differences among the three groups were statistically significant (P<0.05), with higher AAPR-SIRI scores associated with lower survival rates. (3) The results of multifactorial Cox analysis showed that AAPR-SIRI score, Lauren staging, TNM, and indwelling ring cell-containing carcinoma were independent risk factors affecting the prognosis of patients with gastric cancer (all P<0.05). Conclusion (1) There is a correlation between AAPR-SIRI score and clinicopathological features such as tumor diameter size, pathological stage, and neurovascular invasion in patients with gastric cancer. (2) AAPR-SIRI score, Lauren staging, TNM staging, and the presence of indolent cell carcinoma are independent risk factors for prognosis in patients with gastric cancer.