Resumen

BANNURA C, GUILLERMO et al. Prognostic valué of TNM 2002 staging system for colorectal cancer: Analysis of 624 patients. Rev Chil Cir [online]. 2008, vol.60, n.3, pp. 202-211. ISSN 0718-4026.  doi: 10.4067/S0718-40262008000300007.

Background: TNM staging system for colorectal cancer is based on population studies and it is widely used. Aim: To assess the prognostic valué of TNM 2002 in a series of patients. Material and methods: All patients operated for a colorectal cancer in a period of 14 years, were included in the study. Survival was analyzed according to TNM staging. Other intervening variables were also considered in survival analysis such as preoperative carcinoembrionic antigen, degree of cellular differentiation, tumor size and location. Kaplan Myer survival analysis was used, using a log rank analysis to compare curves. ACox regression model was used to determine the main survival prognostic factors. Results: In the study period, 624 patients (353 with colon and 271 with rectal cancer), aged 65 + 13 years, 55 % females, were operated. The follow up ranged from 2 to 186 months with a mean of 48 months. Among tumors excised with a curative purpose, colon and rectal tumor relapse rate was 11 and 30%, respectively (p< 0.01). The 10 years survival probabilities for colon cancer was 93, 91, 100, 80, 48 and 0% for tumors in TNM 2002 stage I, NA, IIB, IIIA, IIIB, IIIC and IV, respectively. The figures for rectal tumors were 93, 89, 78, 59, 68, 34 and 5% respectively. Cox regression disclosed location, preoperative carcinoembrionic antigen and TNM staging from stage IIIA, as independent predictors of survival. Conclusions: There is overlapping of survival curves according to TNM 2002 staging. Therefore, this classification does not adequately stratify survival of patients with colorectal cancer

Palabras clave : Colorectal cancer; survival; TNM staging.