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Journal of Oncology
Volume 2013, Article ID 736756, 6 pages
http://dx.doi.org/10.1155/2013/736756
Research Article

Endoscopic Detection of Early Esophageal Squamous Cell Carcinoma in Patients with Achalasia: Narrow-Band Imaging versus Lugol's Staining

1Gastrointestinal Endoscopy Unit, São Paulo University Medical School, 05403-900 São Paulo, SP, Brazil
2Digestive Surgery Department, São Paulo University Medical School, 05403-900 São Paulo, SP, Brazil
3Endoscopy Unit, Cancer Institute of São Paulo University Medical School, 01246-000 São Paulo, SP, Brazil

Received 16 April 2013; Revised 12 May 2013; Accepted 12 May 2013

Academic Editor: Everson L. A. Artifon

Copyright © 2013 Edson Ide et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Chromoendoscopy with Lugol's staining remains the gold standard technique for detecting superficial SCC. An alternative technique, such as narrow-band imaging (NBI), for “optical staining” would be desirable, since NBI is a simpler technique and has no known complications. In this study, we compare NBI without magnification and chromoendoscopy with Lugol's staining for detecting high-grade dysplasia and intramucosal esophageal squamous cell carcinoma (SCC) in patients with achalasia. This was a prospective observational study of 43 patients with achalasia referred to the Gastrointestinal Endoscopy Unit of the Hospital of Clinics, São Paulo, University Medical School, Brazil, from October 2006 to February 2007. Conventional examinations with white light, NBI, and Lugol staining were consecutively performed, and the suspected lesions were mapped, recorded, and sent for biopsy. The results of the three methods were compared regarding sensitivity, specificity, accuracy, positive predictive value, negative predictive value, positive likelihood value, and negative likelihood value. Of the 43 patients, one was diagnosed with esophageal squamous cell carcinoma, and it was detected by all of the methods. NBI technology without magnification has high sensitivity and negative predictive value for detecting superficial esophageal squamous cell carcinoma, and it has comparable results with those obtained with Lugol's staining.