Prognostic factors for survival after curative resection of Dukes' B colonic cancer

Aim Data on the prognostic factors for survival in patients with locally advanced, node-negative colon cancer are limited. This study aimed to determine which factors might predict survival in patients with Dukes' B (T3 or T4, N0) colon cancer. Method One hundred and eighty (93 male; median age 75 [range, 38-96] years) consecutive patients who had resection of a primary Dukes' B (on final histopathological analysis) colonic cancer between 1998 and 2003 were studied. No patient received neoadjuvant chemotherapy. Multivariate Cox regression modelling was used to assess the prognostic value of variables. Median follow up was 85 (60-125) months. Results Thirteen (7%) patients had a perforation at presentation. The median distance from tumour to the nearest longitudinal resection margin was 6 (0.3-27) cm. One hundred and twenty-four (69%) patients had a lymph node yield of 12 or more nodes. Actual 5-year survival was 59%. On multivariate regression analysis, tumour perforation (perforation vs no perforation, 5-year survival, 23% vs 61%; hazard ratio (HR), 3.7; 95% confidence interval (CI), 1.6-8.4; P = 0.002), tumourto- margin distance (< 5 cm vs 5 cm, 48% vs 65%; HR, 1.7; 95% CI, 1.1-2.7; P = 0.039) and older age (75 years vs < 75 years, 45% vs 72%; HR, 3; 95% CI, 1.8-5; P < 0.001) were independent significant variables. Conclusion A lymph node yield of 12 or more nodes is not a significant prognostic factor for survival after resection of Dukes' B colonic cancer. Patients with tumour perforation or limited resection have worse prognosis.