Inclusion Criteria:  Patients over the age of 18 who underwent a surgical procedure for gastric cancer  Exclusion Criteria:  Patients < 18 years of age Patients with no routine blood examination before surgery or incomplete medical records Patients followed up less than 3 months Patients with additional malignancy Patients having tumors that invading adjacent organs Patients with adjacent or distant metastasis Patients receiving neoadjuvant therapy (chemo- or radiotherapy) Patients with previous malignancy history Patients with a clinical evidence of infection Patients with a history of preoperative use of anti-inflammatory drugs or immunosuppressive treatment Patients with a history of chronic inflammatory disease or autoimmune disease Patients who underwent emergency surgical resection Patients who have undergone R1/R2 resection or those with positive peripheral margins Patients with missing data on follow-up