Rectal cancer: the sphincter-sparing approach

Area of Science:

• Oncology
• Surgical Oncology
• Gastrointestinal Cancer

Background:

• Sphincter-preserving surgery for rectal cancer faces skepticism due to high abdominoperineal resection (APR) rates (40-60%) and positive margin rates (20%).
• Rectal carcinoma exhibits a 10-15% pathologic complete response rate following preoperative chemoradiation therapy.

Purpose of the Study:

• To evaluate the impact of preoperative chemoradiation therapy on reducing positive margin rates in rectal cancer.
• To assess the potential of preoperative therapy to decrease abdominoperineal resection (APR) rates.
• To determine the feasibility of achieving lower distal margins (<1 cm) without increasing recurrence risk post-neoadjuvant therapy.

Main Methods:

• Review of prospective studies on rectal cancer treatment involving preoperative chemoradiation therapy.
• Analysis of reported rates of abdominoperineal resection (APR), positive margins, and pathologic complete response.
• Correlation of tumor regression post-therapy with surgical margin requirements and recurrence rates.

Main Results:

• Preoperative chemoradiation therapy demonstrates significant tumor regression in rectal carcinoma.
• Acceptable distal margins of less than 1 cm are feasible post-therapy, without compromising suture line integrity.
• The APR rate can be reduced to less than 10%, with potential for reduction below 5% with optimized neoadjuvant protocols.

Conclusions:

• Preoperative chemoradiation therapy is a valuable strategy for improving surgical outcomes in rectal cancer.
• This approach effectively reduces positive margin rates and the need for abdominoperineal resection (APR).
• Optimized neoadjuvant chemoradiation and radiation therapy protocols are crucial for achieving superior oncologic results.