Abstract
Background and aims
Linked color imaging (LCI) improved the visibility of gastric cancer and colorectal flat lesions. This study aimed to investigate the usefulness of LCI in detecting superficial esophageal squamous cell carcinomas (SESCC).
Methods
We enrolled 37 consecutive SESCC patients (46 SESCCs) diagnosed using LCI and blue laser imaging bright mode (BLI-BRT) and treated in Hiroshima University Hospital between April 2018 and November 2018. Eight professional endoscopists compared images obtained on non-magnifying BLI-BRT and LCI versus conventional white light imaging (WLI). Identification and boundary diagnosis of SESCC with LCI and BLI-BRT were compared with WLI. Changes in lesion visibility were clarified. Interobserver agreement was assessed. Clinicopathological features of lesion that influence visibility with LCI were assessed.
Results
In LCI, 37% (17/46) of cases had improved visibility and 63% (29/46) had unchanged visibility (interobserver agreement = 0.74). Among cases with multiple lugol voiding lesions (LVLs), ΔE between the lesion and background mucosa was significantly higher in LCI than in WLI (20.8 ± 7.9 vs 9.2 ± 6.1, P < 0.05). No significant differences were found in tumor size, morphological type, color, depth, and smoking or drinking history. However, multiple LVLs were significantly higher among cases with improved versus unchanged visibility. On BLI-BRT, 39% (18/46) of cases had improved visibility and 61% (28/46) had unchanged visibility (interobserver agreement = 0.60).
Conclusion
Almost the same as BLI-BRT, LCI improves SESCC visibility compared with WLI. This is useful for cases with multiple LVLs. In cases without background coloration (BGC), LCI may make SESCC more visible than BLI-BRT.
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This study was approved by the Ethics Review Board at Hiroshima University Hospital on April 5, 2018.
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10388_2020_749_MOESM1_ESM.tiff
Figure S1. Linked color imaging is an image-enhanced endoscopic observation method that emphasizes slight redness differences by making strong red colors stronger and weaker reddish colors weaker (TIFF 94388 kb)
10388_2020_749_MOESM2_ESM.tiff
Figure S2: The Commission Internationale d’Eclairage (CIE) L*a*b* color space. The CIE L*a*b* color space is a color-opponent space with three dimensions: L* (i.e., lightness), a* (i.e., red to green), and b* (i.e., yellow to blue). The color difference between the lesion and surrounding mucosa (i.e., ΔE) is calculated in the L*a*b* space as the distance between two points (black double arrow). The formula of the color difference is as follows: ΔE*①②=[ (ΔL*)2+(Δa*)2+(Δb*)2 ]1/2. It approximates the visual differences detected by the human eye (TIFF 94388 kb)
10388_2020_749_MOESM3_ESM.tiff
Figure S3. (a) The color scores are (1) L*55 a*29 b*28 in the cancerous part and (2) L*53 a*28 b*19 in the non-cancerous part. The color difference between (1) and (2) in the left white light image is 43. (b) The color score is (3) L*42 a*38 b*8 in the cancerous part and (4) L*56 a*9 b*0 in the non-cancerpart. The color difference between (1) and (2) in the left white light image is 551 (TIFF 94388 kb)
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Nakamura, K., Urabe, Y., Oka, S. et al. Usefulness of linked color imaging in the early detection of superficial esophageal squamous cell carcinomas. Esophagus 18, 118–124 (2021). https://doi.org/10.1007/s10388-020-00749-2
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DOI: https://doi.org/10.1007/s10388-020-00749-2