A 60-year-old man with T3N1M0 rectal carcinoma 6 cm from the anal verge undergoes long-course chemoradiotherapy (CRT). After restaging MRI, no residual tumor is seen. He wants to avoid permanent colostomy. What is the most appropriate next step according to current evidence?
- A Proceed with abdominoperineal resection (APR) as planned initially
- B Proceed with low anterior resection (LAR) regardless of clinical complete response
- C Watch and wait (non-operative management) with intensive surveillance protocol ✓
- D Further chemotherapy cycles before any surgical decision
Explanation
The 'watch and wait' strategy (non-operative management) for clinical complete response (cCR) after neoadjuvant CRT for rectal cancer is supported by the OnCoRe registry data and the OPRA trial. In carefully selected patients with cCR (defined by MRI, endoscopy, and clinical assessment), organ preservation with intensive surveillance (clinical examination, MRI, endoscopy every 3-6 months) achieves similar overall survival to immediate surgery. Approximately 25-30% develop local regrowth, which remains resectable with curative intent. This approach preserves anorectal function and avoids the morbidity of low anterior resection or APR.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.