Superiority of a new UICC-TNM staging system for gastric carcinoma.

Background: The definition of the degree of lymph node metastasis (n-classification) for gastric cancer differs greatly in the new Union Internationale Contre le Cancer--TNM classification (5th edition) and the Japanese gastric cancer classification (JGC). The feasibility of the new TNM classification is evaluated in comparison with the JGC.
Methods: At Chiba University, 940 patients who underwent a gastrectomy were retrospectively classified into appropriate stages with both the TNM and JGC systems, and the survival curves of the respective stages were also compared.
Results: Patients with 1 to 6 metastatic nodes (TNM-pN1) showed similar survival rates whether the metastases were limited to the perigastric area (JGC-n1) or reached distant areas (JGC-n2). The patients with node metastasis that was limited to the perigastric area (JGC-n1) had significantly different survival rates, depending on the number of metastatic nodes (TNM-pN1 or pN2, P = .022). A similar phenomenon was also observed in patients with TNM-N2 and JGC-n2. A multivariate analysis indicated the TNM N-classification, rather than the JGC n-classification, as an independent prognostic factor.
Conclusions: The new TNM classification appears to be a better prognostic indicator than the JGC system for patients with gastric carcinoma.