title: Comparison of the 2007 and 2013 ASCO/CAP evaluation systems for HER2 amplification in breast cancer.
abstract: It has been proven that chromosome 17 centromere (CEP17) amplification causes misleading human epidermal growth factor receptor 2 (HER2) gene fluorescence in situ hybridization (FISH) results, precluding anti-HER2-based therapy in some patients with breast carcinoma. We used the 2013 American Society of Clinical Oncology/College of American Pathologists (ASCO/CAP) scoring criteria to evaluate HER2 amplification status in 175 cases of breast carcinoma with chromosome 17 polysomy. We used immunohistochemistry (IHC) to determine the HER2 amplification status, and 2-color FISH to detect CEP17, and reviewed the results of initial evaluation using the 2007 ASCO/CAP criteria. Of the 175 cases, 17, 95, and 63 were IHC 0/1+, 2+, and 3+, respectively. Evaluation of IHC HER2 status according to the 2013 ASCO/CAP criteria identified significantly more HER2-positive cases compared to cases evaluated using the 2007 criteria (p<0.05). When the FISH results were evaluated in parallel with the 2013 criteria, we found that 22 cases were not HER2-negative despite the presence of polysomy 17, which, according to the 2013 criteria, indicates HER2-positive status. Our findings indicate that in breast carcinoma, HER2 status in the presence of polysomy 17 may vary with the scoring criteria used. In turn, performing FISH and evaluating samples using the 2013 ASCO/CAP criteria means that more patients with breast cancer may be appropriate for targeted treatment with trastuzumab, potentially improving their outcome.
authors.affiliation: Department of Pathology, Nanjing University Medical School Affiliated Drum Tower Hospital, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Pu
authors.affiliation: Department of Pathology, Nanjing University Medical School Affiliated Drum Tower Hospital, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China.
authors.forename: Jiong
authors.initials: J
authors.lastname: Shi
authors.affiliation: Department of Pathology, Nanjing University Medical School Affiliated Drum Tower Hospital, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China.
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Pathology, Nanjing University Medical School Affiliated Drum Tower Hospital, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China.
authors.forename: Anning
authors.initials: A
authors.lastname: Feng
authors.affiliation: Department of Pathology, Nanjing University Medical School Affiliated Drum Tower Hospital, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China. Electronic address: yeqing1998@gmail.com.
authors.forename: Qing
authors.initials: Q
authors.lastname: Ye
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology; D018270:Carcinoma, Ductal, Breast / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology; D002886:Chromosomes, Human, Pair 17 / Q000235:genetics*; D005260:Female; D005784:Gene Amplification / Q000235:genetics*; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D008875:Middle Aged; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics*
chemical_list: D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human
keywords: 2013 ASCO/CAP scoring criteria; Breast cancer; Chromosome 17 polysomy; HER2