POSTER SESSION I Monday, March 24, 2003   —  9:30 AM - 12:00 Noon Exhibit Hall A - C ENDOCRINE PATHOLOGY 74 SDHD Gene Mutations in Sporadic and Syndrome-Related Pheochromocytomas (461) H Dannenberg, FH van Nederveen, A Verhofstad, RR de Krijger, WNM Dinjens Erasmus Medical Center, Rotterdam, Netherlands; University Medical Center, Nijmegen, Netherlands 75 COX-2, EGF-R, ER, PR, and HER2/neu Expression in Papillary Thyroid Carcinoma (463) RF Debski, KA Ely, ME Sanders, ME Edgerton Vanderbilt University Medical Center, Nashville, TN 76 Peroxisome Proliferator-Activated Receptor-Gamma Expression in Follicular-Patterned Lesions of the Thyroid: Caveats for the Use of Immunohistochemical Studies (472) KS Gustafson, VA LiVolsi, EE Furth, TL Pasha, ZW Baloch University of Pennsylvania Medical Center, Philadelphia, PA 77 p63-Positive Cells in Solid Cell Nests (SCN's) and Papillary Carcinoma of Thyroid: Evidence for Stem-Cell Regulatory Action of p63 in Thyroid Disorders and Neoplasia (480) CS Nagi, P Unger, BY Wang, DE Burstein Mount Sinai School of Medicine, New York, NY 78 b-Catenin Expression in Papillary Thyroid Carcinoma: Potential Role in Nuclear Envelope Changes (490) SA Rezk, AF Fischer, V Nelson, M Thein, NA Patwardhan, RK Byrnes, A Khan University of Massachusetts Medical School, Worcester, MA; University of Southern California Medical Center, Los Angeles, CA 79 Molecular Mutational Analysis of Medullary Thyroid Carcinoma (492) H Sheikh, K Cieply, M Tometsko, L Niehouse, D Aldeeb, P Swalsky, S Finkelstein, JL Hunt University of Pittsburgh, Pittsburgh, PA