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Adjuvant therapy for rectal cancer--the transatlantic view
1Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, USA. minskyb@mskcc.org
Summary
Pre-operative radiation therapy, often combined with surgery, is crucial for managing rectal cancer by reducing local recurrence. While North America favors combined modality therapy, European centers explore intensive short-course radiation, with ongoing trials comparing efficacy and toxicity for optimal treatment strategies.
Area of Science:
- Oncology
- Surgical Oncology
- Radiation Oncology
Background:
- Two conventional treatments for resectable rectal cancer exist in North America: surgery followed by adjuvant therapy, or pre-operative therapy followed by surgery.
- Pre-operative therapy, particularly combined modality therapy, is increasingly accepted due to potential benefits like reduced toxicity and improved sphincter preservation.
Purpose of the Study:
- To compare the efficacy and outcomes of different pre-operative treatment strategies for rectal cancer.
- To evaluate the role of radiation therapy in reducing local recurrence rates in rectal cancer management.
Main Methods:
- Review of current treatment protocols in North America and Europe.
- Analysis of data from randomized trials, including the Swedish Rectal Cancer Trial and the Dutch CKVO 95-04 TME trial.
- Comparison of local recurrence and survival rates between different therapeutic approaches.
Main Results:
- Pre-operative radiation therapy significantly decreased 5-year local recurrence from 12% to 6% in the Dutch trial.
- Total Mesorectal Excision (TME) surgery alone resulted in a 20% 5-year local recurrence rate for stage III rectal cancer.
- Intensive short-course radiation is not standard in North America due to higher toxicity and lack of sphincter preservation.
Conclusions:
- Radiation therapy remains a necessary component in the adjuvant management of rectal cancer, even after TME surgery.
- Ongoing randomized trials are expected to provide definitive answers on the optimal pre-operative strategy for rectal cancer.
- Balancing treatment efficacy, toxicity, and functional outcomes is key in rectal cancer management.