Ahnen DJ, Macrae FA. Colorectal cancer: Epidemiology, risk factors, and protective factors. Available from: http://www.uptodate.com/contents/colorectal-cancerepidemiology-risk-factors-and-protective-factors.
Berger AC, Sigurdson ER, LeVoyer T, Hanlon A, Mayer RJ, Macdonald JS, et al.Colon cancer survival is associated with decreasing ratio of metastatic to examined lymph nodes. J Clin Oncol 2005; 23(34):8706-12.
National Cancer Registry Report 1986–1987. Tehran, Iran: Ministry of Health, Deputy for Health Directory, CDC Cancer Office; 2008-2009 (Persian).
National Cancer Registry Report 1986–1987. Tehran, Iran: Ministry of Health, Deputy for Health Directory, CDC Cancer Office; 2006-2007 (Persian).
National Cancer Registry Report 1986–1987. Tehran, Iran: Ministry of Health, Deputy for Health Directory, CDC Cancer Office; 2007-2008 (Persian).
Hermanek P. pTNM and residual tumor classifications: problems of assessment and prognostic significance. World J Surg 1995;19(2):184-90.
Tang R, Wang JY, Chen JS, Chang-Chien CR, Tang S, Lin SE, et al.Survival impact of lymph node metastasis in TNM stage III carcinoma of the colon and rectum. J Am Coll Surg 1995; 180(6):705-12.
Joseph NE, Sigurdson ER, Hanlon AL, Wang H, Mayer RJ, MacDonald JS, et al.Accuracy of determining nodal negativity in colorectal cancer on the basis of the number of nodes retrieved on resection. Ann Surg Oncol 2003; 10(3):213-8.
Goldstein NS, Sanford W, Coffey M, Layfield LJ. Lymph node recovery from colorectal resection specimens removed for adenocarcinoma: trends over time and a recommendation for a minimum number of lymph nodes to be recovered. Am J Clin Pathol 1996; 106(2):209-16.
Wong JH, Severino R, Honnebier MB, Tom P, Namiki TS. Number of nodes examined and staging accuracy in colorectal carcinoma. J Clin Oncol 1999; 17(9):2896-900.
Lee HY, Choi HJ, Park KJ, Shin JS, Kwon HC, Roh MS, et al.Prognostic significance of metastatic lymph node ratio in node-positive colon carcinoma. Ann Surg Oncol 2007; 14(5): 1712-7.
Sang-Min Lee, Jong-Seok Shin, Hong-Jo Choi, KiJae Park, Young-Hoon Roh, Hyuk-Chan Kwon, et al.Prognostic implication of metastatic lymph node ratio in node-positive rectal cancer. J Korean Surg Soc 2011; 80(4):260-6.
Sakcak I, Yıldız BD, Avşar FM, Akturan S, Kilic K, Cosgun E, et al.Does N ratio affect survival in D1 and D2 lymph node dissection for gastric cancer? World J Gastroenterol 2011; 17(35): 4007-12.
Bando E, Yonemura Y, Taniguchi K, Fushida S, Fujimura T, Miwa K. Outcome of ratio of lymph node metastasis in gastric carcinoma. Ann Surg Oncol 9(8):775-84.
Nitti D, Marchet A, Olivieri M, Ambrosi A, Mencarelli R, Belluco C, et al.Ratio between metastatic and examined lymph nodes is an independent prognostic factor after D2 resection for gastric cancer: analysis of a large European monoinstitutional experience. Ann Surg Oncol 2003;10(9):1077-85.
Voordeckers M, Vinh-Hung V, Van de Steene J, Lamote J, Storme G.The lymph node ratio as prognostic factor in node-positive breast cancer. Radiother Oncol 2004; 70(3):225-30.
Herr HW. Superiority of ratio based lymph node staging for bladder cancer. J Urol 2003; 169(3):943-5.
Berger AC, Watson JC, Ross EA, Hoffman JP. The metastatic/examined lymph node ratio is an important prognostic factor after pancreaticoduodenectomy for pancreatic adenocarcinoma. Am Surg 2004; 70(3):235-40.
Chin CC, Wang JY, Yeh CY, Kuo YH, Huang WS, Yeh CH. Metastatic lymph node ratio is a more precise predictor of prognosis than number of lymph node metastases in stage III colon cancer. Int J Colorectal Dis 2009; 24(11):1297-302.
Peschaud F, Benoist S, Julié C, Beauchet A, Penna C, Rougier P, et al.The ratio of metastatic to examined lymph nodes is a powerful independent prognostic factor in rectal cancer. Ann Surg 2008; 248(6):1067-73.
Vaccaro CA, Im V, Rossi GL, Quintana GO, Benati ML, Perez de Arenaza D, et al.Lymph node ratio as prognosis factor for colon cancer treated by colorectal surgeons. Dis Colon Rectum 2009; 52(7):1244-50.
Ng M, Roy-Chowdhury S, Lum SS, Morgan JW, Wong JH. The impact of the ratio of positive to total lymph nodes examined and outcome in colorectal cancer. Am Surg 2009; 75(10):873-6.
Wang J, Hassett JM, Dayton MT, Kulaylat MN. Lymph node ratio: role in the staging of node-positive colon cancer. Ann Surg Oncol 2008; 15: 1600-8.
Shimomura M, Ikeda S, Takakura Y, Kawaguchi Y, Tokunaga M, Egi H, et al.Adequate lymph node examination is essential to ensure the prognostic value of the lymph node ratio in patients with stage III colorectal cancer. Surg Today 2011; 41(10):1370-9.
Edge S, Byrd DR, Compton CC, Fritz AG, Greene FL, Trotti A. editors. Colon and rectum. In: American Joint Committee on Cancer: AJCC Cancer Staging Manual. 7th ed. New York (NY): Springer; 2010.
Kang J, Hur H, Min BS, Lee KY, Kim NK. Prognostic impact of the lymph node ratio in rectal cancer patients who underwent preoperative chemoradiation. J Surg Oncol 2011; 104(1):53-8.
Prandi M, Lionetto R, Bini A, Francioni G, Accarpio G, Anfossi A, et al. Prognostic evaluation of stage B colon cancer patients is improved by an adequate lymphadenectomy: results of a secondary analysis of a large scale adjuvant trial. Ann Surg 2002;235(4):458-63.
Chen SL, Steele SR, Eberhardt J, Zhu K, Bilchik A, Stojadinovic A. Lymph node ratio as a quality and prognostic indicator in stage III colon cancer. Ann Surg 2011; 253(1):82-7.
Huh JW, Kim CH, Kim HR, Kim YJ. Factors predicting oncologic outcomes in patients with fewer than 12 lymph nodes retrieved after curative resection for colon cancer. J Surg Oncol 2012; 105(2):125-9.
Micu B, Micu C, Leucuta Dc, Crivii C, Constantea N. The role and prognostic impact of lymph node ratio on stage III colorectal cancer. Clujul Medical 2013; 86 (3): 245-9.
Lu YJ, Lin PC, Lin CC, Wang HS, Yang SH, Jiang JK, et al.The impact of the lymph node ratio is greater than traditional lymph node status in stage III colorectal cancer patients. World J Surg 2013; 37(8): 1927-33.
Galizia G, Orditura M, Ferraraccio F, Castellano P, Pinto M, Zamboli A, et al.The lymph node ratio is a powerful prognostic factor of node-positive colon cancers undergoing potentially curative surgery. World J Surg 2009;33(12):2704-13.
Kim YS, Kim JH, Yoon SM, Choi EK, Ahn SD, Lee SW, et al.Lymph node ratio as a prognostic factor in patients with stage III rectal cancer treated with total mesorectal excision followed by chemoradiotherapy. Int J Radiat Oncol Biol Phys 2009; 74(3): 796-802.
Nadoshan JJ, Omranipour R, Beiki O, Zendedel K, Alibakhshi A, Mahmoodzadeh H. Prognostic value of lymph node ratios in node positive rectal cancer treated with preoperative chemo radiation. Asian Pac J Cancer Prev 2013; 14(6): 3769–72.
Ghahramani L, Moaddabshoar L, Razzaghi S, Hamedi S.H., Pourahmad S, Mohammadianpanah M. Prognostic value of total lymph node identified and ratio of lymph nodes in resected colorectal cancer. Ann Colorectal Res 2013; 1(3): 81-91.