Viewing upper gastrointestinal cancers in a new light

Viewing upper gastrointestinal cancers in a new light
The spectral characteristics of white fluorescence excited by a laser for white light and the short-wavelength laser. LCI expands and reduces color information simultaneously to intensify shades of red and white. Right. LCI enhances the contrast of red and white colors compared with a white light image. Credit: Tokyo Medical and Dental University

Recently there have been significant advances on several fronts in the ongoing war against cancer of the alimentary tract. Now, Japanese researchers report the development of another weapon: Linked Color Imaging (LCI), a novel endoscopic technique that improves detection of cancer by viewing the upper digestive tract mucosa under illumination that combines specific wavelengths of light to intensify subtle color variations indicative of neoplastic change.

Upper gastrointestinal (GI) endoscopy is routinely performed to detect tumorous changes or neoplasia in the pharynx, esophagus, and stomach and is conventionally done under White Light Imaging (WLI). Using the innovative LASEREO system developed by the Fujifilm Corporation, LCI technology balances white light with narrow-band short wavelength in a specific ratio that deepens and enhances the contrast of red and white hues, thus intensifying nuances of mucosal transformation.

Though earlier studies have described the role of LCI in histological diagnosis of upper GI tract tumors, the research team felt the need for a large-scale, broad-based to assess its efficacy in neoplasm detection. "Our research was conducted in 19 hospitals across Japan involving 1502 patients with known past or current gastrointestinal cancer, representing a high-risk population" explains Dr. Shoko Ono, lead author. "Patients underwent upper GI endoscopy under both WLI and LCI protocols wherein they were grouped according to which modality was performed first. Ingeniously, our ensured diagnostic accuracy; not only did each modality serve as a backup and crosscheck on the other, this was further followed by histopathological confirmation."

Dr. Kenro Kawada, co-lead author, describes the results. "With LCI, lesions were detected in 8% of the patients but the detection rate was only 4.8% with WLI. Conversely, with WLI 3.5% of patients had a lesion overlooked but this rate was only 0.67% with LCI. This shows a clear superiority of LCI over conventionally illuminated endoscopic screening for discerning mucosal changes related to upper GIT neoplasia as it detected neoplasia 1.67 times more frequently."

Professor Mototsugu Kato, senior and corresponding author, explains the implications of their research. "Combined with previous studies that show the efficacy of LCI in detecting large intestinal neoplasia, our findings make a strong case for wider adoption of this modality in surveillance of the entire endoscopically accessible digestive tract. However, we need further research to confirm its efficacy in the hands of general clinicians for upper GI screening of an average population."

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Enhanced-image endoscopy more effective than conventional imaging for detecting upper GI cancers

More information: Shoko Ono et al, Linked Color Imaging Focused on Neoplasm Detection in the Upper Gastrointestinal Tract, Annals of Internal Medicine (2020). DOI: 10.7326/M19-2561
Journal information: Annals of Internal Medicine

Provided by Tokyo Medical and Dental University
Citation: Viewing upper gastrointestinal cancers in a new light (2021, January 5) retrieved 18 January 2021 from
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