1. National Comprehensive Cancer Network. NCCN clinical practice guidelines: esophageal and esophagogastric junction cancers, version 1.2017. Available at: https://www.nccn.org/professionals/physician_gls/default.aspx. Accessed February 1, 2018.
2. Is the increasing rate of local excision for stage I rectal cancer in the United States justified? A nationwide cohort study from the National Cancer Database;You;Ann Surg,2007
3. Risk of lymph node metastasis in T1 carcinoma of the colon and rectum;Nascimbeni;Dis Colon Rectum,2002
4. Analysis of risk factors for lymph nodal involvement in early stages of rectal cancer: when can local excision be considered an appropriate treatment? Systematic review and meta-analysis of the literature;Carrara;Int J Surg Oncol,2012
5. Metastatic potential in T1 and T2 colorectal cancer;Fang;Hepatogastroenterology,2005