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Mohammed RAA, Radwan MEM, Alrufayi BM, Abdulaziz LAQ. Does loss of hormonal receptors influence the pathophysiological characteristics of the HER-2 breast cancer phenotype? ACTA ACUST UNITED AC 2018; 25:439-444. [PMID: 30244824 DOI: 10.1016/j.pathophys.2018.09.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 07/13/2018] [Accepted: 09/14/2018] [Indexed: 01/21/2023]
Abstract
BACKGROUND Some breast carcinomas (BC) of the HER-2 type respond poorly to endocrine therapy, indicating that hormonal receptor (HR) status possibly impacts the biological criteria of this tumor class. The aim of this study was to compare the clinicopathological characteristics of HR-positive and HR-negative tumors occurring in HER-2 and non-HER-2 BC. METHODS Tissue microarray sections from 336 primary invasive BC specimens were stained immunohistochemically with antibodies against HER-2, ER, and PR. Proliferation was assessed using Ki67 and the P53 status was identified. RESULTS The HER-2 phenotype was identified in 42/336 (12.5%) specimens, while 293/336 (87.5%) were of the non-HER-2 phenotype. In the non-HER-2 group, 103/293 (35%) were HR-negative tumors. HR negativity was significantly associated with higher tumor grades (P < 0.0001), higher proliferation rates (P < 0.0001), presence of necrosis (P < 0.0001), and with a higher P53 expression (P < 0.0001). There were no differences in patient age, tumor size, LN status, or presence of vascular invasion (VI) between the HR-negative and HR-positive groups. In the HER-2 group, 16/42 (38%) had HR-negative tumors. No significant difference in clinicopathological characteristics, except for tumor grade, was detected between the HR-positive and HR-negative tumors in this group. CONCLUSION Loss of HR does not influence the biological features of HER-2 BC. This finding may indicate that some tumors will 'biologically' move from being HER-2-positive/HR-positive tumors to behaving more like HER-2-positive/HR-negative tumors even when ER are present on the cell surface. Further studies are needed to explore this hypothesis and to identify the subset of tumors that will benefit from endocrine therapy.
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Affiliation(s)
- Rabab Ahmed Ahmed Mohammed
- Department of Pathology, Faculty of Medicine, Assiut University, Assiut, Egypt; Department of Pathology, Faculty of Medicine, Taibah University, Almadinahh Almounawwarah, Saudi Arabia
| | - Moustafa EzEldien M Radwan
- Department of Radiology, Faculty of Medicine, Taibah University, Almadinahh Almounawwarah, Saudi Arabia; Department of Radiology, Faculty of Medicine, Assiut University, Assiut, Egypt.
| | - Bashayer Marzoog Alrufayi
- Undergraduate studies (MBCHB), Faculty of Medicine, Taibah University, Almadinahh Almounawwarah, Saudi Arabia
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2
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Pattern of HER-2 Gene Amplification and Protein Expression in Benign, Borderline, and Malignant Ovarian Serous and Mucinous Neoplasms. Int J Gynecol Pathol 2016; 36:50-57. [PMID: 27309616 DOI: 10.1097/pgp.0000000000000302] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Amplification of HER-2 gene and overexpression of HER-2 receptor play a significant role in the progression of a number of malignancies such as breast cancer. Trastuzumab (anti-HER-2 therapeutic agent) has been used successfully in treatment of breast cancer. The aim of this study was to assess the pattern of HER-2 gene amplification and of HER-2 receptor expression in a spectrum of serous and mucinous ovarian tumors to determine whether HER-2 is altered in these neoplasms similar to that occurring in breast cancer. Formalin-fixed paraffin-embedded microarray tissue sections from 212 specimens were stained with HER-2 antibody using immunohistochemistry and with anti-HER-2 DNA probe using chromogenic in situ hybridization. Specimens consisted of 65 benign tumors (50 serous and 15 mucinous), 26 borderline (13 serous and 13 mucinous), 73 malignant tumors (53 serous carcinoma and 20 mucinous carcinoma), 18 metastatic deposits (13 serous and 5 mucinous), in addition to 30 normal tissues (16 ovarian surface and 14 normal fallopian tube). HER-2 protein-positive expression was not detected in the normal or the benign tissues. Borderline neoplasms showed positive staining, but no overexpression. HER-2 overexpression was seen only in 4 carcinoma specimens: 1/53 (1.8%) primary serous carcinomas and 3/20 (15%) primary mucinous carcinomas. HER-2 gene amplification was seen in 4 specimens: 2 primary mucinous carcinomas and 2 malignant deposits of these 2 mucinous carcinomas. In conclusion, alteration of HER-2 was not detected in ovarian serous neoplasms; however, in mucinous carcinoma, HER-2 amplification and overexpression occur.
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Soares M, Correia J, Rodrigues P, Simões M, de Matos A, Ferreira F. Feline HER2 protein expression levels and gene status in feline mammary carcinoma: optimization of immunohistochemistry (IHC) and in situ hybridization (ISH) techniques. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2013; 19:876-882. [PMID: 23718944 DOI: 10.1017/s1431927613001529] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Human epidermal growth factor receptor (HER2) is a tumor biomarker that when overexpressed and/or amplified is associated with a poor prognosis for women with breast cancer. This specific tumor subtype is eligible for a specific immunotherapy that increases survival period. However, in feline oncology, only a few studies have been performed on molecular characterization of feline (fHER2) in feline mammary carcinoma (FMC), and the available data are inconsistent. In this study, fHER2 protein levels and gene status in FMC were evaluated by immunohistochemistry and in situ hybridization. After being optimized, these techniques revealed that fHER2 is overexpressed in 33% of FMC cases, although fHER2 and fTOP2A gene amplification could not be observed. Our results support the possibility of using FMC as a natural model for comparative oncology. Additional data obtained may also improve the diagnostics, and consequently the treatment, of this type of tumor in veterinary medicine.
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Affiliation(s)
- Maria Soares
- CIISA, Faculdade de Medicina Veterinária, Universidade Técnica de Lisboa, Av. da Universidade Técnica, 1300-477 Lisboa, Portugal
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Farzadnia M, Meibodi NT, Shandiz FH, Mahmoudi M, Bahar MM, Memar B, Amoian S, Maroozi F, Moheghi N. Evaluation of HER2/neu oncoprotein in serum and tissue samples of women with breast cancer: correlation with clinicopathological parameters. Breast 2010; 19:489-92. [PMID: 20675140 DOI: 10.1016/j.breast.2010.05.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2009] [Revised: 05/03/2010] [Accepted: 05/24/2010] [Indexed: 10/19/2022] Open
Abstract
BACKGROUND HER2/neu (HER2) is a proto-oncogen of the EGF Receptor family. The assessment of serum HER2 level is useful for predicting the patients' response to chemotherapy or hormonal therapy and selection of proper patients for treatment with Herceptin. We aimed to compare serum HER2 levels with immunohistochemistry in tumoral tissues and investigate correlation between these levels and various prognostic factors. MATERIALS AND METHODS This cross-sectional study was conducted on 75 patients with breast carcinoma referred to surgical ward of Mashhad Imam Reza's hospital from November 2008 to February 2009. Pre-operative serum samples were collected and stored in -20°C. Surgical samples were investigated for the type of carcinoma, tumor size, lymph node metastasis, stage as well as grade of the tumor. Tissue HER2 over-expression was evaluated by immunohistochemistry (IHC) staining and HER2 levels were studied by ELISA method. Statistical analysis was performed by SPSS software. RESULTS Serum HER2 cut-off level was 18.4 ng/ml; 46.7% of patients were serum HER2-positive and 43% were IHC positive. There was a high statistical correlation between these two parameters (P=0.018). Statistically, there was no significant correlation between serum HER2 and age, tumor size, stage, grade and metastatic lymph nodes (P>0.05). CONCLUSION Serum HER2 level assay can be considered as a complementary method besides tissue methods.
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Affiliation(s)
- Mehdi Farzadnia
- Department of Pathology, Faculty of Medicine, Emam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
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Chen RQ, Yang QK, Lu BW, Yi W, Cantin G, Chen YL, Fearns C, Yates JR, Lee JD. CDC25B mediates rapamycin-induced oncogenic responses in cancer cells. Cancer Res 2009; 69:2663-8. [PMID: 19276368 DOI: 10.1158/0008-5472.can-08-3222] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Because the mammalian target of rapamycin (mTOR) pathway is commonly deregulated in human cancer, mTOR inhibitors, rapamycin and its derivatives, are being actively tested in cancer clinical trials. Clinical updates indicate that the anticancer effect of these drugs is limited, perhaps due to rapamycin-dependent induction of oncogenic cascades by an as yet unclear mechanism. As such, we investigated rapamycin-dependent phosphoproteomics and discovered that 250 phosphosites in 161 cellular proteins were sensitive to rapamycin. Among these, rapamycin regulated four kinases and four phosphatases. A siRNA-dependent screen of these proteins showed that AKT induction by rapamycin was attenuated by depleting cellular CDC25B phosphatase. Rapamycin induces the phosphorylation of CDC25B at Serine375, and mutating this site to Alanine substantially reduced CDC25B phosphatase activity. Additionally, expression of CDC25B (S375A) inhibited the AKT activation by rapamycin, indicating that phosphorylation of CDC25B is critical for CDC25B activity and its ability to transduce rapamycin-induced oncogenic AKT activity. Importantly, we also found that CDC25B depletion in various cancer cell lines enhanced the anticancer effect of rapamycin. Together, using rapamycin phosphoproteomics, we not only advance the global mechanistic understanding of the action of rapamycin but also show that CDC25B may serve as a drug target for improving mTOR-targeted cancer therapies.
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Affiliation(s)
- Run-Qiang Chen
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, USA
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Singer G, Stadlmann S. Pathology of breast tissue obtained in minimally invasive biopsy procedures. Recent Results Cancer Res 2009; 173:137-147. [PMID: 19763453 DOI: 10.1007/978-3-540-31611-4_8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- Gad Singer
- Chefarzt des Instituts für Pathologie, Kantonsspital Baden, 5404, Baden, Switzerland.
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7
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Koletsa T, Kostopoulos I, Charalambous E, Christoforidou B, Nenopoulou E, Kotoula V. A splice variant of HER2 corresponding to Herstatin is expressed in the noncancerous breast and in breast carcinomas. Neoplasia 2008; 10:687-96. [PMID: 18592003 PMCID: PMC2434206 DOI: 10.1593/neo.08314] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2008] [Revised: 04/26/2008] [Accepted: 04/28/2008] [Indexed: 12/21/2022]
Abstract
Herstatin (HST) is an alternatively spliced HER2 product with growth-inhibitory properties in experimental cancer systems. The role of HST in adult human tissues and disease remains unexplored. Here, we investigated HST expression at the mRNA and protein (immunohistochemistry [IHC]) level in parallel with parameters reflecting HER activation in 187 breast carcinomas and matched noncancerous breast tissues (NCBT). Noncancerous breast tissues demonstrated the highest HST/HER2 transcript ratios corresponding to a few positive epithelial and stromal cells by IHC. Although HST/HER2 transcript ratios in tumors were inversely associated with HER2 IHC grading (P = .0048 for HER2 IHC-1+ and P = .0006 for HER2 IHC-2+ vs HER2-negative tumors), relative HST expression within the same tumor/NCBT system remained constant. HST/HER2 ratios did not predict the presence of HST protein, which was found in 46 (25%) of 187 tumors. A subgroup of HER2 IHC-3+ tumors exhibited high HST/HER2 transcript ratios, strong HST protein positivity, and cytoplasmic phospho-Akt/PKB and p21(CIP1/WAF1) localization. In conclusion, HST may act as a paracrine factor in the adult breast. Because HST is described as an endogenous pan-HER inhibitor, the presence of this protein in breast carcinomas may portent the inefficiency of exogenous efforts to block HER2 dimerization, whereas its absence may justify such interventions.
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Affiliation(s)
| | - Ioannis Kostopoulos
- Department of Pathology, Aristotle University Medical School, Thessaloniki, Greece
| | - Elpida Charalambous
- Department of Pathology, Aristotle University Medical School, Thessaloniki, Greece
| | | | - Eleni Nenopoulou
- Department of Pathology, Aristotle University Medical School, Thessaloniki, Greece
| | - Vassiliki Kotoula
- Department of Pathology, Aristotle University Medical School, Thessaloniki, Greece
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Fetsch PA, Abati A. The effects of antibody clone and pretreatment method on the results of HER2 immunostaining in cytologic samples of metastatic breast cancer: A query and a review of the literature. Diagn Cytopathol 2007; 35:319-28. [PMID: 17497656 DOI: 10.1002/dc.20638] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The standardization and use of heat-induced epitope retrieval (HIER) is particularly important with immunohistochemical markers that direct the course of cancer treatment, such as Herceptin therapy. Increasingly, many laboratories are performing immunohistochemical analysis using various antibodies and methodologies for HER2/neu. We attempted to determine the effects of antibody clone and pretreatment methods on the interpretation of HER-2/neu staining in cytologic samples. Cell block sections from 54 cases of metastatic breast cancer (24 FNAs, 30 effusions) were analyzed for HER2 expression using antibodies to CB-11, TAB250, and A0485. Antibodies were analyzed with and without HIER. One pathologist using the FDA-approved scoring system for the HercepTest reviewed all slides in a blinded fashion. Five of fifty-four cases (9%) using CB-11 showed a significant increase in HER2 immunoreactivity using HIER (i.e. from 0/1+ to 2-3+). However, in twenty-nine of fifty-four cases (54%), the cytoplasmic background was significantly higher after HIER. With the A0485 antibody, two of fifty four cases (4%) showed a significant increase in immunoreactivity using HIER, while seventeen of fifty-four cases (31%) exhibited only more pronounced cytoplasmic staining. HIER pretreatment did not increase HER2 staining in any TAB250 stained sample, rather four of fifty-four cases (7%) showed a significant decrease in staining with HIER. We conclude that HIER may enhance membrane staining with the CB-11 and A0485 antibodies, but also increases cytoplasmic background. Loss of antigenicity is seen when HIER is used with TAB250.
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Affiliation(s)
- Patricia A Fetsch
- Cytopathology Section, Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
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9
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Ntoulia M, Kaklamanis L, Valavanis C, Kafousi M, Stathopoulos E, Arapantoni P, Mavroudis D, Georgoulias V, Lianidou ES. HER-2 DNA quantification of paraffin-embedded breast carcinomas with LightCycler real-time PCR in comparison to immunohistochemistry and chromogenic in situ hybridization. Clin Biochem 2006; 39:942-6. [PMID: 16916505 DOI: 10.1016/j.clinbiochem.2006.06.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2005] [Revised: 01/18/2006] [Accepted: 06/02/2006] [Indexed: 11/19/2022]
Abstract
OBJECTIVES To compare the detection of HER-2 status by real-time PCR, on paraffin-embedded breast carcinomas, in respect to immunohistochemistry (IHC) and chromogenic in situ hybridization (CISH). DESIGN AND METHODS Paraffin-embedded breast carcinomas collected from 85 patients diagnosed with early stage breast cancer were analyzed for HER-2 gene amplification by real-time PCR and CISH, as well as for HER-2 protein expression by IHC. RESULTS HER-2 gene amplification was observed in 19 (22.4%) of 85 breast cancer patients by real-time PCR and in 19 (22.4%) of 85 patients by CISH. Strong (3+) HER-2 protein over-expression was observed in 13 (15.3%) out of 85 patients. Moreover, there were 4 out of 85 (4.7%) patients that had moderate (2+) HER-2 protein over-expression, while 68 out of 85 (80%) patients had no HER-2 protein over-expression by IHC. There were strong concordance rates between real-time PCR and IHC (79/85, 92.9%, p<0.0001) and real-time PCR and CISH (77/85, 90.6%, p<0.0001). The concordance rate between the three methods was 90.6% (p<0.0001). CONCLUSIONS Our data show that the results obtained for amplification of HER-2 by real-time PCR on the LightCycler are comparable to those obtained by IHC and CISH.
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Affiliation(s)
- Maria Ntoulia
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, Athens 15771, Greece
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Kong SY, Kang JH, Kwon Y, Kang HS, Chung KW, Kang SH, Lee DH, Ro J, Lee ES. Serum HER-2 concentration in patients with primary breast cancer. J Clin Pathol 2006; 59:373-6. [PMID: 16461567 PMCID: PMC1860357 DOI: 10.1136/jcp.2005.029603] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To evaluate whether serum HER-2/neu (HER-2) concentration is a valid index of HER-2 status in women with primary breast cancer, and to establish a normal reference range for serum HER-2 concentration in Korean women. METHODS Serum HER-2 concentration was measured and immunohistochemistry (IHC) and fluorescence in situ hybridisation (FISH) carried out on tissue samples from 86 consecutive female patients. The results of the three datasets were compared. The cut off value of HER-2 concentration was determined from the mean +2SD values derived from the serum of 93 healthy volunteers. RESULTS The IHC and FISH data were significantly correlated (p<0.01), but neither showed significant correlation with the serum HER-2 data. The cut off value of serum HER-2 was 10.2 microg/l, and the serum HER-2 concentration of patients with primary breast cancer ranged from 5.0 to 17.5 microg/l. Only five patients had a serum HER-2 value above the cut off value. CONCLUSIONS Serum HER-2 concentration cannot be substituted for IHC or FISH to evaluate HER-2 status, nor can it be used as a diagnostic tumour marker in primary breast cancer, considering the low prevalence of serum HER-2 elevation.
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Affiliation(s)
- S-Y Kong
- Research Institute and Hospital, National Cancer Centre, Gyeonggi-do, Korea
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11
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Ma Y, Lespagnard L, Durbecq V, Paesmans M, Desmedt C, Gomez-Galdon M, Veys I, Cardoso F, Sotiriou C, Di Leo A, Piccart MJ, Larsimont D. Polysomy 17 in HER-2/neu Status Elaboration in Breast Cancer: Effect on Daily Practice. Clin Cancer Res 2005; 11:4393-9. [PMID: 15958623 DOI: 10.1158/1078-0432.ccr-04-2256] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE To assess the effect of chromosome 17 copy number on HER-2/neu status determination in breast cancers. EXPERIMENTAL DESIGN HER-2/neu gene copy and chromosome 17 centromere numbers were evaluated on 893 breast carcinomas using double color fluorescence in situ hybridization (FISH). The net and chromosome 17 corrected (ratio) HER-2/neu copy numbers were compared and related to immunohistochemistry done according to the Food and Drug Administration (FDA)-approved scoring system (0, 1+, 2+, and 3+) as a first screening step in 584 cases. RESULTS When a ratio > or = 2 was considered as criterion for FISH positivity, 49.3% (440 of 893) of cases showed amplification versus 56.2% (502 of 893) by using a net HER-2/neu gene copy number >4 as a alternative criterion; 14.8% (67 of 453) of cases having a ratio <2 had a net HER-2/neu gene copy number >4 and 1.1% (5 of 440) with a ratio > or = 2 had a net HER-2/neu gene copy number <4. Among discordant cases, 88.8% (64 of 72) were polysomic (>2.25 chromosomes 17/cell) and among polysomic cases, 12.8% (40 of 312) of the low polysomic (2.26-3.75 chromosomes 17/cell) and 36.9% (24 of 65) of the highly polysomic (>3.75 chromosomes 17/cell) cases showed discordance. In cases with a ratio <2, polysomy 17 incidences were 85.7% (6 of 7) in IHC 3+, 42.4% (79 of 186) in IHC 2+, 33.3% (15 of 45) in IHC 1+, and 29.1% (16 of 55) in IHC 0. CONCLUSION A net increase in HER-2/neu gene copy number consecutive to polysomy 17 in the absence of specific gene amplification might lead to a strong protein overexpression in a small subset of breast carcinomas. HER-2/neu status determination by FISH is dependent on the criterion considered for positivity in clinical practice.
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Affiliation(s)
- Yan Ma
- Pathology Department, Institut Jules Bordet, Brussels, Belgium
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12
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Gjerdrum LM, Sorensen BS, Kjeldsen E, Sorensen FB, Nexo E, Hamilton-Dutoit S. Real-time quantitative PCR of microdissected paraffin-embedded breast carcinoma: an alternative method for HER-2/neu analysis. J Mol Diagn 2004; 6:42-51. [PMID: 14736826 PMCID: PMC1867459 DOI: 10.1016/s1525-1578(10)60490-4] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
We studied the feasibility of using real-time quantitative PCR to determine HER-2 DNA amplification and mRNA expression in microdissected formalin-fixed, paraffin-embedded breast tumors and compared this with standard immunohistochemistry (IHC) and fluorescent in situ hybridization (FISH) methods. Study cases (27 carcinomas and 3 ductal breast carcinoma in situ (DCIS) cases) showed varying Her-2 expression as determined by IHC (HercepTest). In carcinomas, there was a good correlation between HER-2 DNA amplification and strong HER-2 protein expression detected by FISH and IHC, respectively. A single DCIS case was amplified in FISH, but not in IHC. Both HER-2 gene amplification and expression could be quantified in microdissected paraffin-embedded tumors using real-time PCR, DNA and RNA being successfully detected in 146 of 150 (97%) and 141 of 150 (94%) samples, respectively. PCR analysis for HER-2 DNA amplification using the LightCycler HER2/neu DNA Quantification kit (Roche Molecular Biochemicals, Mannheim, Germany) correlated fairly well with IHC and FISH. All IHC HER-2 3+ tumors were amplified according to the kit, as was the FISH-amplified DCIS case. DNA-PCR identified five additional tumors as being amplified. Interestingly, all these scored 2+ with the HercepTest, but were negative using FISH. We believe that real-time quantitative PCR analysis of HER-2 DNA amplification following microdissection represents a useful supplementary or perhaps even an alternative technique for establishing HER-2 status in paraffin-embedded tumors.
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Bertucci F, Borie N, Ginestier C, Groulet A, Charafe-Jauffret E, Adélaïde J, Geneix J, Bachelart L, Finetti P, Koki A, Hermitte F, Hassoun J, Debono S, Viens P, Fert V, Jacquemier J, Birnbaum D. Identification and validation of an ERBB2 gene expression signature in breast cancers. Oncogene 2004; 23:2564-75. [PMID: 14743203 DOI: 10.1038/sj.onc.1207361] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
ERBB2 is a transmembrane tyrosine kinase receptor encoded by a gene located in chromosome region 17q12. Overexpression of ERBB2, generally by way of gene amplification, plays a role in mammary oncogenesis. This alteration can be overcome by use of the humanized monoclonal antibody trastuzumab (Herceptin). Accurate determination of ERBB2 status is required for appropriate use of this targeted therapy and is currently analysed by immunohistochemistry (IHC) on tissue sections and/or fluorescence in situ hybridisation (FISH) on interphase chromosomes. We have studied the gene expression profiles of a series of 213 breast tumours and 16 breast cancer cell lines with known ERBB2 status, using Ipsogen's DiscoveryChip microarrays with approximately 9000 cDNAs. We have identified 36 genes and expressed sequence tags that were differentially expressed in tumours and in cell lines with and without ERBB2 protein overexpression. This ERBB2-specific gene expression signature (GES) contained 29 overexpressed genes including the ERBB2 gene itself, five genes located in its immediate vicinity on 17q12, non-17q genes such as GATA4 and eight downregulated genes including oestrogen receptor alpha (ER). Some correlations were validated at the protein level using IHC on tissue microarrays. The GES was able to distinguish ERBB2-negative and -positive cancer samples, as well as FISH-negative and FISH-positive ERBB2 2+ IHC samples.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Antibodies, Monoclonal/therapeutic use
- Antibodies, Monoclonal, Humanized
- Antineoplastic Agents/therapeutic use
- Breast Neoplasms/classification
- Breast Neoplasms/genetics
- Breast Neoplasms/pathology
- Cell Line, Tumor
- Chromosome Mapping
- Chromosomes, Human, Pair 17
- Down-Regulation
- Expressed Sequence Tags
- Female
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Genes, erbB-2
- Humans
- Immunohistochemistry
- In Situ Hybridization, Fluorescence
- Middle Aged
- Nucleic Acid Amplification Techniques
- Oligonucleotide Array Sequence Analysis
- Predictive Value of Tests
- Reproducibility of Results
- Sensitivity and Specificity
- Trastuzumab
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Affiliation(s)
- François Bertucci
- Département d'Oncologie Moléculaire, Institut Paoli-Calmettes and UMR119 Inserm, IFR57, and Faculté de Médecine, Université de la Méditerranée, Marseille, France
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Ellis IO, Bartlett J, Dowsett M, Humphreys S, Jasani B, Miller K, Pinder SE, Rhodes A, Walker R. Best Practice No 176: Updated recommendations for HER2 testing in the UK. J Clin Pathol 2004; 57:233-7. [PMID: 14990588 PMCID: PMC1770242 DOI: 10.1136/jcp.2003.007724] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2003] [Indexed: 11/03/2022]
Abstract
This paper serves to update previously published guidance on rationale and methodology for HER2 laboratory testing following the recommendation for the use of HER2 targeted treatment in the management of advanced breast cancer in the UK. Emphasis is placed on the standardisation of methodology and assessment and strategies to achieve high quality performance. A two phase testing algorithm based on first line immunocytochemistry evaluation and second line fluorescence in situ hybridisation assessment of borderline cases is recommended. To ensure maintenance of expertise, an annual caseload volume of at least 250 cases is recommended for laboratories providing a testing service.
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Affiliation(s)
- I O Ellis
- Department of Histopathology, Nottingham City Hospital, Hucknall Road, Nottingham NG5 1PB, UK.
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15
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Tartarone A, Romano G, Iodice G, Capobianco A, Di Renzo N. The predictive role of HER2 overexpression in early breast cancer. J Clin Oncol 2003; 21:3179-80; author reply 3180. [PMID: 12915616 DOI: 10.1200/jco.2003.99.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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