Purposes: The purpose of this study was to determine an effective treatment strategy for patients with Stage IV gastric cancer.
Methods: We analyzed the significant prognostic factors in 74 patients who underwent surgery between 1989 and 2005, and were finally determined to have Stage IV gastric cancer. These patients were classified as curability A (n = 0), B (n = 29) and C (n = 45) according to the criteria outlined by Japanese Gastric cancer society. Anti-tumor drugs were used after surgery in some cases. There were 32 patients who received either no treatment or an oral anti-tumor drug, and 42 patients who received new chemotherapeutic regimens.
Results: According to a univariate analysis, the postoperative mean survival times were significantly different; tumor size ≤ 12 cm, a tumor without lymphatic involvement, more than D2 lymphadenectomy, and classification as curability B were favorable prognostic factors. The multivariate analysis revealed that tumor size, lymphadenectomy and curability were independent prognostic factors. In curability B patients, venous involvement was an independent prognostic factor. In curability C patients, both the tumor size and postoperative chemotherapy affected their prognosis.
Conclusions: In patients with curable Stage IV gastric cancer, at least a D2 gastrectomy to reduce the absolute volume of tumor cells, followed by adjuvant chemotherapy, may be essential to improve their prognosis. In incurable cases, aggressive new chemotherapeutic regimens should be the treatment of choice for the prolongation of survival.
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