Clinical application of JNET classification under magnifying endoscopy with narrow-band imaging in colorectal tumors

QIU Quanxing; TANG Yu; HU Xuejun; YUAN Bao

Abstract：Objective:To evaluate the clinical value of Japan Narrow Band Imaging Expert Team(JNET)classifica-tion under magnifying endoscopy with narrow-band imaging for colorectal tumors.Methods:Data of 106 colorectal tumors detected by magnifying endoscopy with narrow-band imaging were reviewed in the retrospective study.JNET typing classification was used for rediagnosis.In order to evaluate the accuracy of JNET typing classification,the results were compared with histological results after endoscopic resection or surgery.Results:The pathological findings of postoperative specimens of colon tumors showed that there were 70 cases of non-early cancer,including 10 cases of hyperplastic polyps(including serrated polyps),60 cases of low-grade intraepithelial neoplasia,36 cases of early canc-er,and 30 cases of malignant tumors,there were 21 cases of high grade intraepithelial neoplasia,7 cases of superficial submucosal carcinoma and 8 cases of deep submucosal carcinoma.The respective accuracy,specificity,sensitivity,posi-tive predictive value,and negative predictive value were as follows.Type 1:98.11％,98.96％,90.00％,90.00％,98.96％,Type 2A:80.19％,71.74％,86.67％,80.00％,80.49％;Type 2B:77.36％,84.62％,57.14％,57.14％,84.62％;Type 3:95.28％,100.00％,37.5％,100.00％,95.15％.The diagnostic accuracy,specificity,sensitivity,positive pre-dictive value,and negative predictive value of JNET classification for colorectal early cancer lesions was 82.08％,90.00％,66.67％,77.42％,84.00％.Conclusion:JNET classification under NBI is effective in judging the colorectal tumor.For low confidence cases,Magnifying Chromoendoscopy is recommended to ensure correct diagnoses.