PMID- 11488070 OWN - NLM STAT- MEDLINE DCOM- 20010823 LR - 20141120 IS - 0002-9173 (Print) IS - 0002-9173 (Linking) VI - 116 IP - 2 DP - 2001 Aug TI - HER2 protein expression and gene amplification in androgen-independent prostate cancer. PG - 234-9 AB - The role of the HER2 receptor remains uncertain in the pathogenesis and progression of human prostate cancer. Previous studies have reported widely divergent rates for HER2 expression in primary prostate tumors, probably owing to significant methodologic differences in the studies. Few data exist about the frequency of HER2 protein overexpression and gene amplification in androgen-independent prostate cancer (AIPC), although recent xenograft models suggest HER2 expression may be up-regulated in the transition from androgen-dependent to androgen-independent disease. We studied the role of HER2 protein in AIPC by immunohistochemical and fluorescence in situ hybridization (FISH) analyses on AIPC specimens using well-characterized and validated reagents. Fourteen (36%) of 39 specimens expressed HER2; however, only 2 (5%) had moderate (2+) expression, and 2 (5%) had high-level (3+) expression. Two (6%) of 36 specimens had gene amplification by FISH. These data suggest that HER2 protein overexpression and gene amplification are relatively uncommon in AIPC. FAU - Reese, D M AU - Reese DM AD - Urologic Oncology Program, Division of Hematology-Oncology, Comprehensive Cancer Center, University of California, 2356 Sutter St, 5th Floor, San Francisco, CA 94115, USA. FAU - Small, E J AU - Small EJ FAU - Magrane, G AU - Magrane G FAU - Waldman, F M AU - Waldman FM FAU - Chew, K AU - Chew K FAU - Sudilovsky, D AU - Sudilovsky D LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Am J Clin Pathol JT - American journal of clinical pathology JID - 0370470 RN - 0 (Androgen Antagonists) RN - 0 (Androgens) RN - 0 (Antibodies, Monoclonal) RN - EC 2.7.10.1 (Receptor, ErbB-2) SB - IM MH - Adenoma/chemistry/pathology/therapy MH - Adult MH - Aged MH - Aged, 80 and over MH - Androgen Antagonists/therapeutic use MH - Androgens/*pharmacology MH - Antibodies, Monoclonal MH - Biopsy MH - Bone Neoplasms/chemistry/secondary MH - *Gene Amplification MH - *Gene Expression MH - Humans MH - Immunoenzyme Techniques MH - In Situ Hybridization, Fluorescence MH - Lymphatic Metastasis MH - Male MH - Middle Aged MH - Neoplasm Metastasis MH - Neoplasm Recurrence, Local MH - Prostatectomy MH - Prostatic Neoplasms/*chemistry/pathology/therapy MH - Receptor, ErbB-2/*analysis/*genetics EDAT- 2001/08/08 10:00 MHDA- 2001/08/24 10:01 CRDT- 2001/08/08 10:00 PHST- 2001/08/08 10:00 [pubmed] PHST- 2001/08/24 10:01 [medline] PHST- 2001/08/08 10:00 [entrez] AID - 10.1309/VXKK-YVRH-9B11-YDPT [doi] PST - ppublish SO - Am J Clin Pathol. 2001 Aug;116(2):234-9. doi: 10.1309/VXKK-YVRH-9B11-YDPT.