Significance of Microscopic Residual Tumor in Adenocarcinoma of Stomach and Esophagogastric Junction after Gastrectomy with D2 Lymphadenectomy

Objective: Microscopic residual tumor (R1 resection) may have a significant negative impact on prognosis of patients with adenocarcinoma of stomach and esophagogastric junction. Results of R1 resection on survival and recurrence patterns have not yet been thoroughly investigated in Thailand. The aim of this study was to study the oncological outcomes of R1 resection after curative intended surgery. Methods: We retrospectively analyzed the medical records of patients who underwent curative intended surgery from 2005 to 2013 at Siriraj Hospital. Results: 162 patients underwent curative intended gastrectomy with radical lymphadenectomy. 122 (75.3%) patients received R0 resection (non-residual group), 40 (24.7%) patients had microscopic residual tumor (residual group). Microscopic residual tumor was associated with tumor size (p=0.008), tumor extension (p=0.028), pT-stage (p=0.012), pN-stage (p=0.012), and AJCC/TNM stage (p