Non-Operative Management of Esophageal Cancer with Complete Clinical Response After Neoadjuvant Therapy: Current Status and Future Directions

Introduction: Esophagectomy has traditionally been considered mandatory after neoadjuvant therapy for locally advanced esophageal cancer. However, recent evidence has challenged this paradigm and motivated interest in organ-preservation strategies with active surveillance in patients achieving clinical complete response (cCR). Methods: A literature search was performed using PubMed/MEDLINE, ScienceDirect, and Embase databases to identify relevant studies related to non-operative management (NOM) of esophageal cancer. Evidence was synthesized qualitatively with a critical focus on the biological rationale of NOM, diagnostic limitations of response-assessment, oncologic outcomes associated with surveillance strategies and the evolving role of molecular biomarkers. Results: The safety of NOM with active surveillance is tightly linked to the diagnostic accuracy of response assessment. Although structured multimodal response assessment protocols combining endoscopy, endoscopic ultrasound, and PET-CT have shown acceptable performance, residual clinically undetectable disease might persist in some patients. Evidence from the SANO trial has suggested non-inferior short-term survival outcomes of NOM compared with immediate esophagectomy in carefully selected patients with cCR after neoadjuvant chemoradiotherapy treated within specialized centers. Nevertheless, long-term oncologic outcomes remain unknown, and uncertainty persists regarding the broader applicability of this strategy outside specialized multidisciplinary settings. Emerging biomarker-driven approaches including PD-L1 expression, microsatellite instability, and circulating tumor DNA (ctDNA) may further refine response assessment and help identify patients most suitable for organ-preservation strategies. Conclusions: Active surveillance represents a promising alternative to immediate esophagectomy in selected patients with cCR after neoadjuvant therapy. However, further studies with longer follow-up and standardized surveillance protocols are still needed to safely implement this strategy outside trial settings.