Postoperative recurrence and risk factors of colorectal cancer perforation

Purpose The common causes of colorectal perforation are benign. However, perforated colorectal cancer confers a risk of recurrence in the long term because of the malignant nature of the disease. In addition, the recurrence rate can also increase because of dissemination of cancer cells, reduced extent of lymph node dissection to prioritize saving life, and other reasons. Methods We evaluated the clinical features and postoperative recurrence in patients with perforated colorectal cancer who developed general peritonitis and underwent emergency surgery during a 7-year period between April 2007 and March 2014. Results During the study period, 44 patients had colorectal cancer perforation. The cancer sites were the ascending colon in 6 patients, transverse colon in 1, descending colon in 4, sigmoid colon in 15, and rectum in 18. The disease stage was stage II in 18 patients, stage III in 15, and stage IV in 7. Among 22 patients who could be followed up, 8 had postoperative recurrence. The recurrence rates were 18.2% for stage II cancer and 54.5% for stage III. Postoperative recurrence was more likely to occur in the patients positive for lymph node metastasis, those with poorly differentiated adenocarcinoma, those with T4 cancer, and those who did not receive postoperative adjuvant chemotherapy. Conclusion The recurrence rate was higher in the patients with perforated colorectal cancer than in those who underwent surgery for common colorectal cancer. The prognosis can be expected to improve by performing standard surgical procedures, to the maximum extent possible, followed by postoperative adjuvant chemotherapy.