OBJECTIVETo explore the risk factors contributing to the progression-free survival rate of patients undergoing endoscopic non-curative resection.

METHODSClinicopathological data of patients with early colorectal carcinoma and intraepithelial neoplasia undergoing endoscopic resection in our department from January 2009 to January 2015 were collected. Associated factors affecting the progression-free survival rate of the early colorectal carcinoma after endoscopic non-curative resection were analyzed. Any of the following conditions was defined as endoscopic non-curative resection: (1) positive lateral or vertical cutting margin; (2) submucosa invasion depth ≥1 000 μm; (3) vascular or lymphatic invasion; (4) low differentiation, including signet ring cell carcinoma or mucinous adenocarcinoma; (5) high grade tumor budding.

RESULTSClinicopathological data of 840 cases were collected. According to China's Endoscopic Screening, Diagnosis and Treatment Guidelines for Early Colorectal Cancer, 56(56/840, 6.7%) cases were defined as the non-curative resection, the metastasis or recurrence rate was 14.3%(8/56), 3-year progression-free survival rate was 85.7%(48/56), and 3-year overall survival rate was 94.6%(53/56). Univariate prognostic analysis showed that 3-year progression-free survival rate in low and moderate-high differentiation adenocarcinoma was 25.0% and 90.4%(χ=6.711, P=0.010), in patients with submucosa invasion depth ≥2 000 μm and <2 000 μm was 75.0% and 93.8%(χ=6.745, P=0.009), and in patients with and without vascular or lymphatic invasion was 60.0% and 88.2%(χ=7.708, P=0.005), whose differences were all significant. Multivariate Cox regression analysis revealed that low differentiation adencarcinoma (P=0.015, HR=8.021, 95%CI: 1.499-42.921), invasion depth ≥2 000 μm (HR=6.823, 95%CI: 1.299-35.848) and vascular or lymphatic invasion (HR=18.143, 95%CI: 2.079-158.358) were independent risk factors for the progression-free survival rate of the early colorectal carcinoma after endoscopic non-curative resection.

CONCLUSIONPathology after endoscopic non-curative resection for early colorectal carcinoma indicates that low differentiation adenocarcinoma, submucosa invasion depth ≥2 000 μm and vascular or lymphatic invasion are independent risk factors of poor prognosis.