POSTER SESSION V Wednesday, March 26, 2003   —  9:30 AM - 12:00 Noon EXHIBIT HALL A - C GASTROINTESTINAL PATHOLOGY 78 Serial Analysis of Gene Expression in Gastrointestinal Stromal Tumor (GIST) Cell Lines (600) Z-M Sheng, JA Fletcher, TJ O'Leary Armed Forces Institute of Pathology, Rockville, MD; Brigham and Women's Hospital, Boston, MA 79 KIT Mutation Analysis in NF-1 Patients with Multiple Gastrointestinal Stromal Tumors (GIST) (622) RK Yantiss, AE Rosenberg, CR Antonescu UMass Memorial Health care, Worcester, MA; Massachusetts General Hospital, Boston, MA; Memorial Sloan Kettering Cancer Center, New York, NY 80 Prognostication of Gastrointestinal Stromal Tumors - A Review from a Single Institution (591) GP Paner, S Silberman, S Alkan, GV Aranha, GG Hartman Loyola University Medical Center, Maywood, IL 81 Angiosarcoma of the Intestinal Tract (507) KH Allison, BJ Yoder, MP Bronner, JR Goldblum, BP Rubin University of Washington Medical Center, Seattle, WA; Cleveland Clinic Foundation, Cleveland, OH 82 Inflammatory Fibroid Polyps of the Gastrointestinal Tract: Clinical, Pathologic and Molecular Characteristics (588) JA Ozolek, U Rao, E Sasatomi, PA Swalsky, A Krasinskas, SD Finkelstein University of Pittsburgh, Pittsburgh, PA 83 Benign Fibroblastic Polyps of the Colon: A Histologic, and Immunohistochemical Study (529) F Eslami-Varzaneh, ME Robert, M Kashgarian, JR Goldblum, D Jain Yale University, School of Medicine, New Haven, CT; Cleveland Clinic, Cleveland, OH 84 Elastosis and Elastofibromatous Change in the Gastrointestinal Tract: A Study of Eight Cases (549) CM Hobbs, DM Burch AFIP, Washington, DC 85 Grading of Anal Dysplasia: A Study of Inter- and Intra-Observer Variability (526) B Dipasquale, P Colquhoun, JJ Nogueras, R Petras, S Wexner, SL Woodhouse Cleveland Clinic Florida Hospital, Naples, FL; University of Western Ontario, London, ON, Canada; Cleveland Clinic Florida Hospital, Weston, FL; Ameripath, Cleveland, OH 86 Different Keratin Expression Profile in Squamous Cell Carcinoma of the Rectum and the Anus: Implication of Histogenesis of Squamous Cell Carcinoma in Gastrointestinal Glandular Mucosa (602) J Shia, L Temple, WD Wong, B Chen, M Russo, PB Paty, JG Guillem, MR Weiser, B Minsky, DS Klimstra Memorial Sloan-Kettering Cancer Center, New York, NY 87 Mucosa-Associated Lymphoid Tissue (MALT) Lymphoma of the Stomach: Evaluation of the Accompanying Morphological Alterations of the Gastric Mucosa (510) J Baena, JJ Sola, G Toledo, F Vega, E de Alava, MD Lozano, MA Idoate, J Pardo CUN, Pamplona, Spain 88 Lymphoid Lesions of the Colon: Analysis of Histologic Features (610) Z Tang, W Jing, V Deshpande, G Lauwers, J Ferry, N Harris, L Zukerberg Massachusetts General Hospital, Harvard Medical School, Boston, MA 89 A Critical Role for 4-1BB in Allograft Rejection Mediated by CD8[sup]+[/sup] T Cells (562) OS Kim, Z Guo, J Wang, J Hart, CP Larsen, KA Newell University of Chicago, Chicago, IL; Emory University, Atlanta, GA 90 Do Juvenile Polyps Age? (565) MM Koker, HD Appelman University of Michigan, Ann Arbor, MI 91 Utility of Immunohistochemistry in Distinguishing Invasive Adenocarcinoma from Misplaced Epithelium in Colonic Adenomas (560) P Kaur, T Nazeer, JS Ross, CE Sheehan, TA Jennings Albany Medical College, Albany, NY 92 Signet Ring Cell Change Versus Signet Ring Cell Carcinoma: A Comparative Morphological and Immunohistochemical Analysis (614) DM Weinrach, K Wang, J Ramirez, P Keh, MS Rao Northwestern Feinberg School of Medicine, Chicago, IL 93 Mucosal Denervation Is Common in Chronic Constipation with and without Hirschsprung Disease (HD) (584) V Neppalli, G Wendelschafer-Crabb, AS Wallschlaeger, S Askari, H Maeta, WR Kennedy, J Jessurun Univesity of Minnesota, Minneapolis, MN