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Local excision and post-operative radiation therapy for rectal carcinoma
C S Wong1, H Stern, B J Cummings
1Department of Radiation Oncology, Princess Margaret Hospital, Toronto, Canada.
Summary
Post-operative radiation therapy can be an effective alternative to radical surgery for rectal cancer patients at high risk of local recurrence. This approach offers a chance for disease-free survival and preserved anorectal function in selected cases.
Area of Science:
- Oncology
- Radiation Oncology
- Surgical Oncology
Background:
- Local excision and electrocoagulation are conservative surgical options for rectal cancer.
- Post-operative radiation therapy (PORT) is considered for patients at high risk of local recurrence.
- PORT may be an alternative for patients refusing colostomy or high-risk radical surgery.
Purpose of the Study:
- To evaluate treatment failure patterns and outcomes.
- To assess the efficacy of PORT after conservative rectal cancer surgery.
Main Methods:
- Twenty-five rectal cancer patients received PORT (50 Gy in 20 fractions) post-local excision/electrocoagulation.
- Patients had no palpable residual disease and were selected based on specific criteria.
- Follow-up assessed local control, survival, and anorectal function.
Main Results:
- Six of 25 patients experienced local primary site failure; no lymph node failures occurred.
- Twenty of 25 patients remained disease-free with a median follow-up of 6 years.
- Longer treatment time (>30 days) correlated with increased local failure; large radiation fields were associated with higher morbidity.
Conclusions:
- PORT is a viable alternative to radical surgery for selected rectal cancer patients.
- It can improve outcomes for those at high risk of local recurrence.
- Careful consideration of radiation field size is needed to minimize morbidity.