Surgery of colorectal cancer: surgical morbidity and five- and ten-year results in 2400 patients--monoinstitutional experience.

The objective of this study was to determine surgical morbidity and long-term outcome of colorectal cancer surgery for quality control reasons and as the basis for new treatment modalities. Surgically treated colorectal cancer patients (mean age 65 years) were followed prospectively in a university center (110 months mean follow-up, 1978-1999). Overall survival (OAS), radicality, extent of resection, recurrence, and morbidity were analyzed (log-rank test of survival, multivariate analysis). Altogether, 2452 colorectal cancers localized in the colon (CC, 44.6%), rectum (RC, 44.8%) or multicentric (CRC, 10.6%) were of UICC stages I (19%), II (30%), III (21%), IV (20%), or undetermined (10%). Radicality and stage but not tumor localization influenced the OAS (p <0.0001). The 5-year/10-year OASs were 50%/42% (all), 78%/66% (R0), 46%/36% (R1), 4%/0% (R2), 0% (unresected) and 86%/79% (I), 70%/58% (II), 42%/33% (III), 3%/0% (IV) or 21%/12% (undetermined), respectively (p <0.0001). Multivisceral resections (17%) resulted in morbidity and survival rates equal to those for standard resection. The overall tumor recurrence rate was 27%, mainly with both local and distant relapse (15%). Surgery-related complications occurred in 18% (all), 14% (CC), 21% (RC), or 20% (CRC). The perineal infection rate (RC) was 4%, overall anastomotic leakage 1%, and mortality rate 0.8%. A prospective, uniform follow-up used over two decades warrants quality control in colorectal cancer surgery, which was curative for half of the patients. The morbidity and mortality were low and were not increased by multivisceral resections.