The effect of obstruction and perforation on colorectal cancer disease-free survival

Obstruction (OBSTR) and perforation (PERF) in colorectal cancer impact adversely upon outcomes, and cancer-related survival may also be affected. However, data are sparse, particularly on disease-free survival (DFS) where the cancer is both obstructed and perforated (OBS-PERF).

Data were extracted from a prospectively collected database of 1876 colorectal cancer patients managed and followed up at the Royal Brisbane Hospital from 1984 to 2004. The patients who had curative surgery (n = 1426) were classified as OBSTR (n = 153), PERF (n = 53), OBS-PERF (n = 19), and uncomplicated (UNCOM; n = 1201). Kaplan-Meier survival and Cox proportional hazard analyses were performed.

Postoperative mortality within 30 days of surgery was 1.5% (n = 22) and the overall complication rate was 40.8% (n = 582). However, only 7.2% (n = 102) required reoperations. The median survival time was 71 (IQR = 64.9-77.1) months and the median follow-up for DFS was 37.5 (IQR 14-68) months. The overall recurrence rate was 32.7% (n = 466), the local recurrence rate was 9.4% (n = 135), and local and distant recurrences occurred in the same patient in 4.7% (n = 67). Male gender, OBSTR, PERF, OBS-PERF, emergency operation, major medical and surgical complications, reoperation, TNM staging, tumor grading, and tumor venous invasion adversely affected DFS (p < 0.05). Multivariate analysis showed that OBS-PERF (p = 0.008), major medical complications (p = 0.011), reoperation (p = 0.018), TNM staging (p < 0.001), grading (p = 0.018), and venous invasion (p = 0.002) were independently associated with a poorer DFS.

OBS-PERF colorectal cancer is associated with a poorer DFS, which may be worse than either OBSTR or PERF alone.