Is Preoperative Screening Colonoscopy Useful In Patients With Gastric Cancer?

290 Background: In patients with gastric cancer (GC), the most common double cancer is colorectal cancer (CRC). However, the meaning of screening colonoscopy has not been established. The aim of this retrospective study was to evaluate the useful of screening colonoscopy in preoperative patients with GC. Methods: This study included 689 patients who received screening colonoscopy before gastric surgery between 2012 and 2016. Multivariate analysis using logistic regression model was conducted to elucidate independent risk factors of CRC. Then, we investigated the clinicopathological factors for CRC. Results: Colorectal adenomas and CRC were observed in 315 patients (46%) and 37 patients (5.4%), respectively. The clinical T classification of the CRC were as follows; Tis: 24 patients (65%), T1: 8 patients (21%), T2: 2 patients (6%), and T3: 3 patients (8%). In multivariate analysis, male (OR 5.04, 95% C.I. 1.29-19.6, p = 0.020) was revealed as risk factor for affecting CRC. The treatments for CRC were as follows; EMR was performed in 27 patients, simultaneous resection with GC was performed in 9 patients, resection after gastrectomy was performed in 1 patient, respectively. Pathological stage of CRC was as follows; Stage 0: 24 patients, Stage I: 10 patients, and Stage IIA: 3 patients, respectively. As for the patients who underwent surgery for CRC, all of them received radical colectomy. No patient died for CRC who received colonoscopy before gastric surgery. Conclusions: Screening colonoscopy is useful for GC patients. Because most of the synchronous CRC were found early stage and curatively treated.