Background: Peritoneal carcinomatosis is a common pattern of recurrence in gastric cancer and is associated with a poor prognosis. Determining predictive factors for peritoneal recurrence can help the selection of patients suitable for more aggressive treatment strategies.
Methods: A retrospective chart review of 162 patients diagnosed with gastric cancer with no peritoneal carcinomatosis and treated at a single institution in Brazil from January 1994 to December 2004 was carried out. Univariate and multivariate analyses were performed to identify patient and tumor-related characteristics associated with the development of peritoneal metastasis.
Results: Twenty-three (14.2%) patients developed peritoneal carcinomatosis. Three independent factors associated with the development of peritoneal metastasis were identified by multivariate analysis: signet-ring cell histology (odds ratio [OR] = 4.9; P = 0.018), the presence of vascular invasion (OR = 4.8; P = 0.022), and the presence of visceral metastasis at diagnosis (OR = 5.1; P = 0.011). Tumor stages T3 or T4 showed a trend towards significance (P = 0.062).
Conclusions: Patients with gastric cancer presenting with signet-ring histology, vascular invasion, or visceral metastasis appear to be at higher risk for the development of peritoneal carcinomatosis.
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