[Effect radiotherapy on postoperative staging and residual tumor cell density in rectal cancers]

[Preoperative concurrent radiochemotherapy for cancer of the rectum]

PURPOSE

To evaluate retrospectively treatment-related morbidity of concurrent radiotherapy and chemotherapy for rectal cancer.

PATIENTS AND METHODS

Between 1992 and 1995, 38 patients (median age: 60) were treated for locally advanced resectable rectal cancer. Median dose of radiotherapy was 45 Gy/25 fractions/5 weeks. Chemotherapy consisted of two courses of 5-fluorouracil and leucovorin administered during the first and the fifth weeks of radiotherapy. Median dose of 5-fluorouracil was 350 mg/m2/day, and median dose of leucovorin was 20 mg/m2/day, day 1 to day 5. Surgery was performed 5 weeks after completion of radiotherapy.

RESULTS

Before surgery, one patient died of febrile neutropenia and sepsis after two cycles of chemotherapy and 45 Gy. Main pre-operative grade 3-4 toxicities were respectively: neutropenia: 3%; nausea/vomiting: 3%; diarrhea: 3%; proctitis: 5%; radiation dermatitis: 8%. Twenty-six patients underwent a low anterior resection and 11 an abdomino-perineal resection. A temporary colostomy was performed in 12 patients. Pathologic complete response rate was 27%. There was one post-operative death due to thromboembolic disease. Major post-operative grade 3-4 complications were: pelvic infection: 14%; abdominal infection: 5%; perineal sepsis: 8%; anastomotic dehiscence: 8%; cardiac failure: 5%. Delayed perineal wound healing was observed in six patients. No significant prognosic factor of post-operative complications has been observed. Median duration of hospitalization was 22 days. With a median follow-up of 24 months, 2-year overall and disease-free survival rates were 82 and 64%.

CONCLUSION

Tolerance of preoperative concurrent chemoradiotherapy was acceptable. Ongoing controlled studies will assess the impact of this combined treatment on survival.