Detection of human epidermal growth factor receptor 2 protein and gene in fine needle aspiration cytology specimens and tissue sections from invasive breast cancer: can cytology specimens take the place of tissue sections?
Overexpression of HER2 protein and HER2 gene amplification in breast cancer are prognostic factors for the response to specific medical treatments such as trastuzumab, endocrine therapy, and chemotherapy. Whereas HER2 expression and gene amplification are generally examined in tissue sections, we investigated whether specimens from fine needle aspiration cytology (FNAC) are adequate for these analyses. HER2 protein overexpression and HER2 gene amplification were assessed in both FNAC specimens and tissue sections from 58 cases of invasive breast cancer. Immunohistochemistry assay for HER2 protein expression was performed according to the HercepTest protocol, and HER2 gene amplification was examined with the Spot-light CISH (chromogenic in situ hybridization) Detection kit. There was a significant positive correlation between assessments of HER2 protein status in the cytology specimens and tissue sections. The sensitivity, specificity, and accuracy of HER2 gene amplification detection in cytology specimens in relation to those in tissue sections were 84.0% (21/25 cases), 87.9% (29/33 cases), and 86.2% (50/58 cases), respectively. FNAC specimens are suitable for detection of HER2 overexpression and HER2 gene amplification in invasive breast cancer.
Sumiyoshi
Kazuhiro
K
Department of Pathology, Osaka Medical College, Osaka, Japan.
Shibayama
Yuro
Y
Akashi
Shizuka
S
Nohara
Takehiro
T
Iwamoto
Mitsuhiko
M
Kobayashi
Toshihiro
T
Nishimura
Haruto
H
Yoshinaka
Ryoji
R
Harada
Tomoaki
T
Tanigawa
Nobuhiko
N
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044963:Biopsy, Fine-Needle / Q000379:methods; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D044584:Carcinoma, Ductal / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002886:Chromosomes, Human, Pair 17 / Q000235:genetics; D066246:ErbB Receptors / Q000032:analysis / Q000235:genetics*; D005260:Female; D005784:Gene Amplification; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization / Q000379:methods; D008297:Male; D008867:Microtomy / Q000379:methods; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000032:analysis / Q000235:genetics; D015203:Reproducibility of Results; D016707:Tissue Fixation
D066246:ErbB Receptors; D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human