[One-stage curative treatment of neoplastic colonic obstruction: long-term results, comparison with elective surgery and therapeutic implications].

Over a period of ten years (1980-1989) 528 patients with colon cancer were treated at one institution. One hundred seventy nine (33.9%) were obstructed (O) and underwent emergency surgery, while 349 received elective (E) treatment; of these 363 had one-stage curative treatment. Operative mortality was 10.3% (O) and 3.5% (E) respectively (p < .0.5). Three hundred forty three patients survived surgery and entered follow-up: 96 were O (M:F, 54:42) and 247 E (M:F, 119:128, p = N.S.). Their mean age was 69.5 and 64.4 (p < .001), respectively. Dukes' stage and histological grading were evenly distributed within the two groups, but sites of the primary were not (p < .001). During the follow-up local recurrence occurred in 40 patients (13 O, 27 E, p = N.S.) and metastatic disease in 78 (28 O, 50 E, p < .05, Life Table Analysis) including liver recurrence in 17 O and 30 E (p = .063). Five year crude survival (51%) was significantly worse in obstructed patients. Multivariate analysis showed that Dukes' stage and obstruction were the only prognostic factors of recurrent disease, while survival was affected by the same variables and age over 70. When recurrent disease was introduced in the model survival depended on Dukes' stage, site of the primary and age over 70 and the variable obstruction disappeared as prognostic factor. Right sided tumours showed a better and those at the splenic flexure a worse prognosis. Despite one-stage curative treatment obstruction carries a significantly higher risk of developing metastatic disease, suggesting that obstruction enhances cancer cell dissemination. These patients might benefit from per-operative intra-portal and post-operative systemic adjuvant chemotherapy.