Lymph Node Evaluation and Long-Term Survival in Stage II and Stage III Colon Cancer: A National Study
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The most important prognostic factor in colonic cancer is the presence or absence of regional lymph nodes metastases. The aim of this study was to evaluate the relationship between 5-year mortality in the New Zealand population, and the number of nodes examined in Stage II and III colon cancers.
New Zealand Cancer Registry data were retrieved for patients with colonic cancer from January 1995 to July 2003. Patients with incomplete entries, Stage I tumors, and distant metastases were excluded from analysis. Univariate and Cox regression models were used with 5-year mortality as the primary endpoint.
The study identified 4309 patients. Younger age, female gender, Pacific Island descent, and right-sided tumors were associated with significantly higher lymph node retrieval. Cox regression analysis showed that the number of nodes examined was a significant predictor of 5-year mortality when age, sex, ethnicity, and site were controlled for. Five-year survival consistently improved between nodal strata until the 16-node mark, above which survival advantage was minimal. For Stage III cancers, a higher lymph node ratio was associated with a significant increase in mortality.
Increased rates of nodal examination are associated with a significantly lower 5-year mortality for Stage II and III colonic cancer, but this survival advantage appears to be minimal after the 16-node mark. The lymph node ratio has been validated as a powerful predictor of survival in Stage III cancer. Our results support the current practice of harvesting and examining as many nodes as possible during attempted curative resection.
KeywordsImprove Lymph Node Incomplete Entry Zealand Cancer Registry Attempted Curative Resection Nodal Stratum
- 1.New Zealand Health Information Service. Cancer: New Registrations and Deaths: 1993. Wellington: Ministry of Health, 1997.Google Scholar
- 6.Stage III. The classification of cancer of the rectum. J Pathol. 1932;35:323–32.Google Scholar
- 7.Simpson WC, Mayo CW. The mural penetration of the carcinoma cell in the colon: anatomic and clinical study. Surg Gynecol Obstet. 1939;68:872–7.Google Scholar
- 9.Vather R, Sammour T, Zargar K, Metcalf PA, Connolly AB, Hill AG. Lymph node examination as a predictor of long-term outcome in Dukes B colon cancer. Int J Colorectal Dis. 2008 Aug 21 [Epub ahead of print].Google Scholar
- 14.Fielding LP, Arsenault PA, Chapuis PH, Dent O, Gathright B, Hardcastle JD, et al. Clinicopathological staging for colorectal cancer: an International Documentation System (IDS) and an International Comprehensive Anatomical Terminology (ICAT). J Gastroenterol Hepatol. 1991;6:325–44.PubMedCrossRefGoogle Scholar
- 15.National Quality Forum. Specifications of the national voluntary consensus standards for breast and colon cancer. http://www.qualityforum.org/pdf/cancer/txbreast-colonAppA-Specsvoting01-18-07clean.pdf. Accessed 18 Jan 2007.
- 20.De Ridder M, Vinh-Hung V, Van Nieuwenhove Y, et al. Prognostic value of the lymph node ratio in node positive colon cancer. Gut. 2006;55:1681.Google Scholar