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• W3208708140 abstract "Introduction: Endoscopic submucosal dissection (ESD) continues to gain traction as an important treatment for gastric neoplasia. Some gastric low-grade dysplasia (LGD) and high-grade dysplasia (HGD) on endoscopic forceps biopsy (EFB) are diagnosed as gastric adenocarcinoma (GAC) after ESD. To date, there are no large studies from the Western population on demographic or endoscopic characteristics that can help clinicians differentiate GAC from dysplastic lesions during endoscopy. We aimed to determine which patient or lesion characteristics could predict the histological diagnosis of gastric lesions after ESD. Further, we evaluated the factors associated with the pathologic upstaging from EFB to ESD. Methods: This retrospective study analyzed data from 309 patients who had gastric ESD at 25 centers in North America between 2010 and 2019. We used logistic regression to identify patient demographics and endoscopic features that could predict HGD or GAC on the resected specimens and upstage diagnosis. Results: We analyzed 85 LGD, 85 HGD, and 139 GAC cases. 119 GAC cases were differentiated and 20 were poorly differentiated. 4.1% of LGD and 12.8% of HGD on EFB were upstaged to GAC after ESD. Higher dysplasia grades after ESD were more likely in older patients, tumors in the upper and lower thirds of the stomach, polypoid or depressed lesions (vs. flat non-depressed lesions), and ulcerated lesions. Tumor size was not a significant predictor of dysplasia grade. Logistic regression revealed age (odds ratio [OR] = 1.050, P = 0.00004), the presence of ulceration (OR = 2.763, P = 0.0016), and tumors in the upper third (OR = 2.348, P = 0.0123) or lower third (OR = 1.920, P = 0.0149) significantly predicted GAC. Depressed lesions were more common in HGD or GAC as compared to LGD (OR = 2.831, P = 0.0034). Larger tumors and depressed lesions were associated with differentiated GAC as compared to poorly differentiated GAC (P = 0.0079 and 0.0110, respectively). Conclusion: In this large North American cohort of gastric ESD, we found that tumor location in the upper and lower thirds, ulceration, and patient age may predict GAC. Endoscopists should be cognizant of these characteristics as up to 16.9% of lesion pathology from EFB may be upstaged to GAC after endoscopic resection. Our findings emphasize the importance of recognizing demographic and lesion-based predictors of gastric cancers to better guide clinicians during endoscopy.Table 1.: Logistic regression of demographic patient characteristics and endoscopic lesion characteristics for the presence of adenocarcinoma after resection by endoscopic submucosal dissection" @default.
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• W3208708140 date "2021-10-01" @default.
• W3208708140 modified "2023-10-18" @default.
• W3208708140 title "S1046 Predicting Histological Diagnosis After Endoscopic Submucosal Dissection With Demographic Characteristics and Endoscopic Lesion Characteristics: An Analysis of a Large Cohort in North America" @default.
• W3208708140 doi "https://doi.org/10.14309/01.ajg.0000777716.97798.02" @default.
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