Sa1303 ACCURACY OF PREOPERATIVE ENDOSCOPIC MUCOSAL BIOPSIES WITH POORLY DIFFRENTIATED ESOPHAGEAL ADENOCARCINOMA COMPARED TO POST ENDOSCOPIC AND SURGICAL RESECTION PATHOLOGY

Endoscopic resection of early esophageal adenocarcinoma (EAC) should only be performed for tumors without high risk features of lymph node metastasis (LNM), including poor differentiation, lymphovascular invasion (LVI), and deep submucosal involvement. Poorly differentiated tumors are defined by <50% gland formation. Determination of gland formation can be affected by tissue sample size, which is variable in tissue obtained from preoperative...