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Comparison of different approaches for assessment of HER2 expression on protein and mRNA level: prediction of chemotherapy response in the neoadjuvant GeparTrio trial (NCT00544765)

Breast Cancer Research and Treatment volume 126, pages 109–117 (2011)Cite this article

Abstract

Human epidermal growth factor receptor 2 (HER2) testing is an essential part of pathological assessment in breast cancer patients, as HER2 provides not only prognostic but also predictive information on response to targeted therapy. So far, HER2 test accuracy of immunohistochemistry/in situ-hybridization techniques is still under debate, and more reliable and robust technologies are needed. To address this issue and to evaluate the predictive value of HER2 on chemotherapy, we investigated a cohort of 278 patients from the GeparTrio trial, a prospective neoadjuvant anthracycline/taxane-based multicenter study. In the GeparTrio trial, patients were not treated with any anti-HER2 therapy, as this was not standard therapy at this time. The HER2 status was analyzed by three different approaches: local and central evaluation using immunohistochemistry combined with in situ-hybridization as well as evaluation of HER2 mRNA expression using kinetic RT-PCR from formalin-fixed, paraffin-embedded (FFPE) tissue samples using a predefined cutoff. HER2 overexpression/amplification was observed in 37.3% (91/244) and 17.9% (41/229) of the informative samples in the local and central evaluations, respectively. Positive HER2 mRNA levels were found in 19.8% (55/278). We observed a highly significant correlation between central HER2 expression and HER2 status measured by kinetic RT-PCR (r = 0.856, P < 0.0001) and an overall agreement of 95.6% (κ statistic, 0.862, CI 0.77–0.94). Further, central HER2 as well as HER2 mRNA expression were predictors for a pathological complete response after neoadjuvant anthracycline/taxane-based primary chemotherapy in a univariate binary logistic regression analysis (OR 3.29, P = 0.002; OR 2.65, P = 0.004). The predictive value could be confirmed for the central HER2 status by multivariate analysis (OR 3.04, P = 0.027). The locally assessed HER2 status was not predictive of response to chemotherapy. Our results suggest that standardized methods are preferable for evaluation of HER2 status. The kinetic RT-PCR from FFPE tissue might be an additional approach for assessment of this important prognostic and predictive parameter but has to be confirmed by other studies.

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Fig. 1

Abbreviations

CI:

Confidence interval

ER:

Estrogen receptor

FISH:

Fluorescence in situ-hybridization

FFPE:

Formalin-fixed, paraffin-embedded

HER2:

Human epidermal growth factor receptor 2

HR:

Hormone receptor

NCT:

Neoadjuvant chemotherapy

NX:

Vinorelbine, capecitabine

pCR:

Pathological complete response

OR:

Odds ratio

PgR:

Progesterone receptor

SISH:

Silver-enhanced in situ-hybridization

TAC:

Docetaxel, doxorubicin, and cyclophosphamide

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Acknowledgments

We would like to thank Mrs. Petra Wachs, Mrs. Gabriela Altmann, and Mrs. Claudia Roth for her excellent technical assistance.

Conflict of interest

The authors declare that they have no competing interests. Ralf Kronenwett, Christian von Törne, and Ralph Wirtz are employees of Siemens Healthcare Diagnostics, Cologne, Germany.

Author information

Affiliations

  1. Institute of Pathology, University Hospital Zurich, Zurich, Switzerland

    A. Noske

  2. Institute of Pathology, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany

    A. Noske, S. Darb-Esfahani, B. M. Müller & C. Denkert

  3. German Breast Group, Neu-Isenburg, Germany

    S. Loibl, M. Roller, J. Steffen & G. von Minckwitz

  4. Molecular Research, Siemens Healthcare Diagnostics, Cologne, Germany

    R. Kronenwett, C. von Toerne & R. Wirtz

  5. Institute of Pathology, Kliniken Sindelfingen-Böblingen, Böblingen, Germany

    I. Baumann

  6. Department of Gynaecology, St. Josefs-Hospital Wiesbaden, Wiesbaden, Germany

    G. Hoffmann

  7. Medical Office of Gynaecology, Fürstenwalde, Germany

    G. Heinrich

  8. Medical Office of Gynaecology, Quedlinburg, Germany

    S. T. Grasshoff

  9. Department of Gynecology, Klinikum Karlsruhe, Karlsruhe, Germany

    H. U. Ulmer

  10. Department of Gynecology, University Hospital Düsseldorf, Düsseldorf, Germany

    G. von Minckwitz

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  1. A. Noske
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  2. S. Loibl
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Correspondence to C. Denkert.

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Noske, A., Loibl, S., Darb-Esfahani, S. et al. Comparison of different approaches for assessment of HER2 expression on protein and mRNA level: prediction of chemotherapy response in the neoadjuvant GeparTrio trial (NCT00544765). Breast Cancer Res Treat 126, 109–117 (2011). https://doi.org/10.1007/s10549-010-1316-y

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  • DOI: https://doi.org/10.1007/s10549-010-1316-y

Keywords

  • HER2
  • Kinetic RT-PCR
  • Breast cancer
  • Neoadjuvant therapy
  • Pathological complete response