Survival Rate and Prognostic Factors in Perforated Colorectal Cancer Patients: A Case-Control Study

ABSTRACT

PURPOSE: Perforations are rare but serious complications in colorectal cancer. Controversy exists over whether to perform a radical operation because colorectal cancer perforation is considered as an advanced stage disease, and septic complications of peritonitis have been identified as being responsible for a poor prognosis. The aim of this study was to assess the correlation between the survival rate and the clinicopathological parameters that might be used as predictive factors of the prognosis for perforated colorectal cancer. METHODS: The analysis was based on 24 cases of perforated colorectal cancer (the case group), 48 cases of matching uncomplicated colorectal cancer (the control group), and 72 cases of the case and the control groups combined together (the combined group), all of which were identified during a 10-yr period in a single institution. RESULTS: The five-year survival rates of the perforated colorectal cancer patients and their matching controls were similar (P=0.484). No significant differences in the locations of the cancer, the pre-operative carcinoembryonic antigen (CEA) levels, the tumor sizes, the resection margins, or the numbers of the lymph nodes harvested were found between the two groups. A univariate analysis of the prognostic factors that influenced the case group revealed that adjuvant chemotherapy (P=0.004) was significantly correlated to a better five-year survival rate. A univariate analysis of the prognostic factors that influenced the five-year survival rate of the combined group revealed that the stage (P<0.001), the pre-op CEA level (P=0.018), the angio invasion (P=0.019), the perineural invasion (P=0.019), the number of harvested lymph nodes (P=0.004), and adjuvant chemotherapy (P=0.001) were significantly correlated to the five-year survival rate. The identified independent prognostic factors in the combined group were the stage (hazard ratio, 5.20), angio-invasion (hazard ratio, 2.81), and adjuvant chemotherapy (hazard ratio, 0.17). CONCLUSION: The clinical pathway of perforated colorectal cancer is similar to that of uncomplicated colorectal cancer. Therefore, perforated colorectal cancer patients should be recommended for treatment with the appropriate radical operation and adjuvant chemotherapy based on oncologic principles.