J Cancer 2018; 9(14):2428-2435. doi:10.7150/jca.24675

Research Paper

Additional lymphadenectomy might not improve survival of patients with resectable metastatic colorectal adenocarcinoma of T4 stage, proximal location, poor/undifferentiation, or N3/N4 stages: a large population-based study.

Yang-Yang Zhou1,*, Qing-Wei Zhang2,*, Jian Huang3,*, Xia-Lin Yan4, Chao Chen1, Fan-Fan Xu1, Xiao-Jing Du1, Rong Jin1,5✉

1. Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou325000, Zhejiang, China.
2. Division of Gastroenterology and Hepatology, Key Laboratory of Gastroenterology and Hepatology, Ministry of Health, Renji Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai Institute of Digestive Disease;145 Middle Shandong Road, Shanghai 200001, China.
3. Department of Gastroenterology, Yuyao People's Hospital of Zhejiang Province, The Affiliated Yangming Hospital of Ningbo University, Ningbo 315400, Zhejiang, China.
4. Department of Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197, Ruijin 2nd Rd, Shanghai 200025, China.
5. Department of Epidemiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou325000, Zhejiang, China.
* Equal contributions

Abstract

This study was performed to evaluate the prognostic effect of lymphadenectomy on outcomes in patients with resectable metastatic colorectal adenocarcinoma (mCRC). We selected patients with mCRC from 2004 to 2013 from Surveillance, Epidemiology, and End Results Program (SEER) database. Kaplan-Meier analysis, univariate Cox regression and multivariate Cox regression analysis were performed to assess the clinical value of lymphadenectomy on overall survival (OS) and cause-specific survival (CSS) of patients with resectable mCRC. A total 24178 eligible patients were included, 23056 (95.36%) of which received lymphadenectomy. Results showed that lymphadenectomy was an independent protective factor for survival of patients with mCRC overall [OS (HR: 0.86, 95%CI: 0.79-0.93, P=0.002) and CSS (HR: 0.85, 95%CI: 0.78-0.93, P<0.001)]. Further analysis showed that lymphadenectomy improved survival of patients with T1 stage [OS (HR: 0.51, 95%CI: 0.39-0.66, P<0.001); CSS (HR: 0.48, 95%CI: 0.36-0.65, P<0.001)], distal [OS (HR: 0.65, 95%CI: 0.56-0.75, P<0.001); CSS (HR: 0.65, 95%CI: 0.65-0.75, P<0.001)], rectal [OS (HR: 0.60, 95%CI: 0.52-0.70, P<0.001); CSS (HR: 0.59, 95%CI: 0.51-0.69, P<0.001)] , well/moderately differentiated [OS (HR: 0.62, 95%CI: 0.56-0.70, P<0.001); CSS (HR: 0.62, 95%CI: 0.55-0.69, P<0.001)], N1 stage [OS (HR: 0.76, 95%CI: 0.67-0.85, P<0.001); CSS (HR: 0.74, 95%CI: 0.65-0.84, P<0.001)] and N2 stage [OS (HR: 0.63, 95%CI: 0.54-0.74, P<0.001; CSS (HR: 0.65, 95%CI: 0.55-0.77, P<0.001)) mCRC. While lymphadenectomy might not improve survival of patients with T4 stage, proximal, poor or undifferentiated, N3 and N4 stage mCRC. In general, Additional lymphadenectomy was suggested for patients with mCRC overall. However, lymphadenectomy might not improve survival of patients with mCRC of higher malignancy tendency, such as T4 stage, proximal location, poor or undifferentiation, N3 and N4 stages.

Keywords: Metastatic colorectal adenocarcinoma, SEER, Lymphadenectomy, Overall survival, Cause-specific survival

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How to cite this article:
Zhou YY, Zhang QW, Huang J, Yan XL, Chen C, Xu FF, Du XJ, Jin R. Additional lymphadenectomy might not improve survival of patients with resectable metastatic colorectal adenocarcinoma of T4 stage, proximal location, poor/undifferentiation, or N3/N4 stages: a large population-based study.. J Cancer 2018; 9(14):2428-2435. doi:10.7150/jca.24675. Available from http://www.jcancer.org/v09p2428.htm