title: Her-2/neu gene amplification compared with HER-2/neu protein overexpression on ultrasound guided core-needle biopsy specimens of breast carcinoma.
abstract: Genomic amplification and oncoprotein overexpression of Her-2/neu was studied on ultrasound core needle biopsy specimens of the infiltrative ductal carcinomas of the breast. We performed two colour fluorescence in situ hybridization (FISH) for Her-2/neu and chromosome 17 and compared the FISH results with the immunohistochemical overexpression of Her-2/neu protein by 2 antibodies (DAKO HercepTest and the BioGenex monoclonal antibody AM 134-5M). Furthermore, following radical mastectomy with axillary dissection, Her-2/neu status of the patients were compared with the well known histopathological prognostic factors such as histologic grade, tumor stage, lympho/ vascular invasion, surgical margin status and Paget s disease. Amplification was demonstrated 27% of the cases. Her-2/neu protein overexpression was detected in 47% and 80% of the cases with CB11 and HercepTest respectively. We revealed statistically significant association between the tumor, oncoprotein expression and oncogene amplification (p<0.05). The results of our study showed that combination of IHC and FISH methods enhances the evaluation of tumor genetics at both gene and protein level for the analysis of Her-2/neu in breast carcinoma.
authors.affiliation: Marmara University Hospital, Department of Pathology Altunizade, Istanbul, 81190, Turkey. hkaya@superonline.com
authors.forename: H
authors.initials: H
authors.lastname: Kaya
authors.forename: T
authors.initials: T
authors.lastname: Ragazzini
authors.forename: E
authors.initials: E
authors.lastname: Aribal
authors.forename: I
authors.initials: I
authors.lastname: Güney
authors.forename: E
authors.initials: E
authors.lastname: Kotiloglu
mesh_terms: D000328:Adult; D000368:Aged; D001707:Biopsy, Needle; D001943:Breast Neoplasms / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D018270:Carcinoma, Ductal, Breast / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005784:Gene Amplification; D015870:Gene Expression; D006801:Humans; D007124:Immunoenzyme Techniques; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008875:Middle Aged; D009367:Neoplasm Staging; D010144:Paget's Disease, Mammary / Q000378:metabolism / Q000473:pathology; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics* / Q000378:metabolism*; D016217:Ultrasonography, Mammary
chemical_list: D018719:Erb-b2 Receptor Tyrosine Kinases