Aims and background: Gastric cancer is the second leading cause of cancer death worldwide; the risk of dying depends on several patient and disease characteristics. An existing prognostic score predicts survival in gastric cancer patients undergoing curative resection based on patient age, tumor site, extent of wall invasion and nodal status, categorized as simply as negative or positive.
Methods: Our aim was to modify the original prognostic score by incorporating information on nodal stage according to the latest TNM classification (number of involved nodes), based on a retrospective series of 610 chemotherapy-naive gastric cancer patients recruited to a surgical clinical trial. We then tested the modified score on an independent series of 136 gastric cancer patients.
Results: Nodal stage added significant prognostic information to the nodal status classification (P < 0.001), and was therefore included in the modified score. With the latter, we were able to identify three risk groups with overall five-year survival varying from more than 70% to less than 30%. The prognostic performance of the modified score was better than that achieved with the AJCC-UICC TNM staging.
Conclusions: The modified score, based on established prognostic factors, is proposed as a simple tool for prognostic grouping of gastric cancer patients undergoing curative surgery.