[Impact of the French consensus guidelines on the management of colonic and rectal cancer: a population-based study].

Aim: To compare the management of colorectal cancer (CRC) before and after the French consensus conferences of rectal cancer (RC) in 1994 and colonic cancer (CC) in 1998.
Methods: From 344 CCR incident cases in 1992 and 545 in 2000, patient characteristics, tumor data, and diagnostic and treatment modalities were collected to compare the management of CRC.
Results: Post-operative mortality did not change significantly (4% in 1992 and 2.8% in 2000). No trends were observed in disease stage at diagnosis or rate of resection. For patients with CC (n=244 in 1992 and n=396 in 2000), the number of resection specimens with at least 12 lymph nodes increased from 11% in 1992 to 27% in 2000 (p<0.001). For CC with Dukes stage C and D, the use of chemotherapy increased significantly: for Dukes Stage C from 45% in 1992 to 55% in 2000; for Dukes Stage D from 37% in 1992 to 67% in 2000. For patients with RC (n=100 in 1992 and n=149 in 2000), no change in use of adjuvant radiotherapy was observed: 59% in 1992 versus 53.4% in 2000. Preoperative radiotherapy for RC was performed in 63% in 1992 and 75% in 2000 (p=0.7).
Conclusion: The consensus guidelines appear to have moderately influenced management practices. A better diffusion of guidelines to practitioners and a systematic evaluation of actual practices would be helpful to improve their impact.