These tumors comprise 2–5% of all EMPs and tend to be identified Bioactive Compound Library research buy late unless an endoscopic examination is performed Methods: We report a rare case of gastric plasmacytoma that was treated with endoscopic resection and oral thalidomide therapy. A 70-year-old man was admitted because of indigestion. He had no specific medical history, and his laboratory results were unremarkable. Gastroscopy was performed, and a flat elevated lesion with focal erythematous changes was observed in the anterior wall of the antrum (Fig. 1). Biopsy showed atypical lymphocytes.

Endoscopic submucosal dissection was performed for the diagnosis and treatment by using an insulation-tipped knife (KD-610L; Olympus Tokyo, Japan) (Fig. 2). The resected specimen showed infiltration of plasma cells into the lamina propria; however, these cells did not extend deeply into the submucosal layer (Fig. 3). Stem Cells inhibitor Radiological and hematological evaluations, including bone marrow biopsy, were performed that showed no involvement of other organs. Finally, the patient was diagnosed with extramedullary

gastric plasmacytoma. Results: extramedullary plasmacytoma is a systemic disease, and hence, the patient was treated with oral thalidomide and dexamethasone. Follow-up gastroendoscopy was performed 6 months later, and the patient’s condition was found to

be stable. Conclusion: Gastric plasmacytoma is classified into nodular, infiltrative, ulcerative, and polypoid types, with the nodular type being the most common. Most gastric plasmacytomas are large and deeply infiltrating tumors with ulceration; however, in the early stage, tumor cells are limited to the mucosal and submucosal layers. Almost all patients with EMP undergo radiation therapy, surgery, or combination therapy (surgery and/or chemotherapy or irradiation). Key Word(s): 1. plasmacytoma; 2. ESD; 3. oral thalidomide; 4. H.pylori.; Presenting Author: YOUN HEE CHO Additional Authors: PIK3C2G SU JIN HONG, DAE YONG KIM, GYU SEOK CHO, GUI AE JEONG, HEE KYUNG KIM, JAE PIL HAN, MIN JIN KIM, BONG MIN KO, MOON SUNG LEE Corresponding Author: SU JIN HONG Affiliations: Soonchunhyang University College of Medicine Objective: The aim of this study was to compare the outcomes of ESD and gastrectomy according to the two indications for ESD (guideline criteria and expanded criteria). Methods: Between January 2004 and July 2007, 230 EGCs of 213 patients was enrolled in this study. Fifty-five patients were included in the guideline criteria (GC) group and 158 in the expanded criteria (EC) group. In the GC group, 35 patients underwent ESD, while 20 underwent gastrectomy. In the EC group, 107 patients underwent ESD, while 51 underwent gastrectomy.