POSTER SESSION VI Wednesday, March 10, 2004   —  1:00 - 4:00 p.m. Exhibit Hall B and C GASTROINTESTINAL PATHOLOGY 61 Clinical, Pathologic and Immunohistochemical Study of Small De Novo Colorectal Adenocarcinomas (523) RD Odze, FA Farraye, JL Hornick - Brigham and Women's Hospital; Boston University Medical Center, Boston, MA 62 Immunohistochemistry (IHC) for Prediction of Germ-Line Mismatch Repair (MMR) Gene Mutation in Colorectal Carcinomas and Adenomas: How Good Is it? (537) J Shia, D Klimstra, K Nafa, K Offit, J Guillem, A Markowitz, W Gerald, N Ellis - Memorial Sloan-Kettering Cancer Center, NY 63 Mucin Immunohistochemistry in Colorectal Signet Ring Carcinoma: Correlation with Microsatellite Instability and Survival, and Comparison with Polyps and Other Cancer Subtypes (491) S Kakar, TC Smyrk, DH Kim, GE Kim, YS Kim - VA and UCSF Medical Center, San Francisco, CA; Mayo Clinic, Rochester, MN 64 Cyclooxygenase 2 Expression in Microsatellite Stable and Unstable Colorectal Cancers (542) WM Smith, ML Prasad, A Lehman, A de la Chapelle, WL Frankel - Ohio State University, Columbus, OH 65 Clinicopathologic Differences Regarding MLH1 and MSH2 Expression in Microsatellite Instability (MSI) Colorectal Carcinoma (527) A Paya, C Alenda, R Jover, FM Peiro Grupo de Oncologia Digestiva AEG - Hospital General Universitario, Alicante, Spain 66 The Role of Defective DNA Mismatch Repair in the Pathogenesis of Appendiceal Mucinous Neoplasms (516) J Misdraji, LJ Burgart, GY Lauwers - James Homer Wright Pathology Laboratories at Massachusetts General Hospital, Boston, MA; Mayo Clinic, Rochester, MN 67 Downstaging of Residual Tumor in Resected Rectal Adenocarcinomas after Preoperative Radiochemotherapy (488) S Jakate, M Brand, T Saclarides - Rush University Medical Center, Chicago, IL 68 Pathological Response Following Long Course Chemoradiotherapy for Locally Advanced Rectal Cancer (531) R Ryan, D Gibbons, M Moriarty, H Mulcahy, D O'Donoghue, D Fennelly, D Treanor, A White, J Hyland, K Sheahan - Centre for Colorectal Disease, St Vincent's University Hospital, Dublin, Ireland 69 Lymph Node Recoveries after Total Mesorectal Excision for Rectal Adenocarcinoma and Impact of Preoperative Radiotherapy (490) C Julie, F Peschaud, A Bauchet, B Nordlinger, B Franc, C Penna - Ambroise Pare Hospital, Boulogne, France 70 Is Manual Dissection of Colonic Lymph Nodes Sufficient? (507) TM Luckasevic, HG Brown - Allegheny General Hospital, Pittsburgh, PA 71 Pathologic Comparison of Sentinel Lymph Nodes (SLN) vs. Non-Sentinel Lymph Nodes (nSLN) in Colorectal Carcinoma (550) D Wiese, S Saha, M Nolff - McLaren Regional Medical Center, Michigan State University, Flint, MI 72 Frequent Loss of Chromosomes 16q and 18q in Ileal Carcinoid Tumors Compared to Non-Ileal Carcinoid Tumors and Pancreatic Endocrine Tumors (549) GG Wang, T-T Wu, SR Hamilton, A Rashid - The University of Texas M.D. Anderson Cancer Center, Houston, TX 73 Pathological Features and Thier Prognostic Implications of Non High Grade Colorectal Endocrine Neoplasms: A Long Term Follow-Up Study (497) MP Kumarasinghe - Singapore General Hospital, Singapore, Singapore 74 Is Expression of CDX2 in Neuroendocrine Carcinomas (NECs) Restricted to Those of Gastrointestinal Origin? (483) AW Hing, HC Hwang, TS Barry, H Yaziji, LC Goldstein, AM Gown - PhenoPath Laboratories and Immunocytochemistry Research Institute Seattle, Seattle, WA 75 Immunohistochemical Stains Useful in Distinguishing between Metastatic Carcinoid Tumor and Metastatic Lobular Carcinoma of the Breast (453) S Aksoy, TC Smyrk - Mayo Clinic/ Mayo Graduate School of Medicine, Rochester, MN 76 Expression of Neuropilin-1 in High Grade Dysplasia, Invasive Cancer, and Metastases of the Human Gastrointestinal Tract (482) DE Hansel, RE Wilentz, CJ Yeo, RD Schulick, E Montgomery, A Maitra - The Johns Hopkins University School of Medicine, Baltimore, MD 77 Pim-1 Protein Kinase a Novel Biomarker of Gastrointestinal Primary and Metastatic Adenocarcinomas (470) S Di Caro, L Lourduraj, H Tao, A Gasbarrini, AR Sepulveda - University of Pittsburgh, Pittsburgh, PA; Catholic University of Rome, Rome, Italy 78 Metastatic Pulmonary Carcinoma to Small Bowel Presenting as Primary Neoplasia: A Clinicopathologic Analysis of 7 Cases (528) E Pryor, N Kilinc, O Basturk, SJ Deroux, G Lauwers, JD Cheng, NV Adsay - Harper University Hospital, Karmanos Cancer Institute and Wayne State University, Detroit, MI; Office of the Medical Examiner, New York, NY; Massachussettes General Hospital, Boston, MA; Providence Hospital, Southfield, MI