Accuracy of EUS and ME-NBI for Evaluating the Invasion Depth of Early Esophageal Cancer

Objective To assess the accuracy of endoscopic ultrasound (EUS) and magnifying endoscopy with narrow-band imaging (ME-NBI) in evaluating the invasion depth of early esophageal carcinoma. Methods Patients who underwent endoscopic resection for early esophageal cancer from March 2013 to October 2017 were enrolled. The EUS and ME-NBI results were compared with the pathology results. Results A total of 392 lesions from 333 patients were assessed, including 83 mild and moderate dysplasia, 72 severe dysplasia, 235 squamous cell carcinoma, and 2 adenosquamous carcinoma. About 308 lesions were given EUS only, 7 had ME-NBI only, 77 underwent both EUS and ME-NBI. EUS resulted in a 43.9% accuracy for the 385 lesions, with poor consistency (Kappa=0.1) with the pathology results. But higher accuracy (68.2%) was found for lesions infiltrating into the submucosa of the lesions, compared with 40.5% for lesions contained within the mucosa (P=0.001). ME-NBI resulted in a 72.6% accuracy for the 84 lesions, with a medium consistency (Kappa=0.4). The accuracy for lesions contained within the mucosa was 91.0%, compared with 16.7% for lesions infilrtrating into the submucosa (P=0.001). EUS and ME-NBI for the 77 lesions demonstrated an accuracy of 42.9% for the EUS and 84.3% for the ME-NBI (P=0.001). Conclusion ME-NBI has higher accuracy than EUS in evaluating the invasion depth of early esophageal carcinoma.