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Breast Cancer Research and Treatment

, Volume 137, Issue 2, pp 523–531 | Cite as

Adding hormonal therapy to chemotherapy and trastuzumab improves prognosis in patients with hormone receptor-positive and human epidermal growth factor receptor 2-positive primary breast cancer

  • Naoki Hayashi
  • Naoki Niikura
  • Hideko Yamauchi
  • Seigo Nakamura
  • Naoto T. Ueno
Epidemiology

Abstract

Adjuvant hormonal therapy for hormone receptor (HR)-positive primary breast cancer patients and a human epidermal growth factor receptor 2 (HER2)-targeted agent for HER2-positive primary breast cancer patients are standard treatment. However, it is not well known whether adding hormonal therapy to the combination of preoperative or postoperative chemotherapy and HER2-targeted agent contributes any additional clinical benefit in patients with HR-positive/HER2-positive primary breast cancer regardless of cross-talk between HR and HER2. We retrospectively reviewed records from 897 patients with HR-positive/HER2-positive primary breast cancer with clinical stage I–III disease who underwent surgery between 1988 and 2009. We determined the overall survival (OS) and disease-free survival (DFS) rates according to whether they received hormonal therapy or not and according to the type of hormonal therapy, tamoxifen and aromatase inhibitor, they received. The median followup time was 52.8 months (range 1–294.6 months). Patients who received hormonal therapy with chemotherapy and trastuzumab (n = 128) had significantly higher OS and DFS rates than did those who received only chemotherapy and trastuzumab (n = 46) in log-rank analysis (OS 96.1 vs. 87.0 %, p = 0.023, DFS 86.7 vs. 78.3 %, p = 0.029). There was no statistical difference in OS or DFS between those given an aromatase inhibitor and those given tamoxifen. In multivariate analysis, receiving hormonal therapy in addition to the combination of chemotherapy and trastuzumab was the sole independent prognostic factor for DFS (hazard ratio 0.446; 95 % CI 0.200–0.992; p = 0.048), and there was a similar trend in OS. Our study supported that hormonal therapy, whether in the form of an aromatase inhibitor or tamoxifen, confers a survival benefit when added to chemotherapy and trastuzumab in patients with HR-positive/HER2-positive primary breast cancer. Adjuvant treatment without hormonal therapy is inferior for this patient population.

Keywords

Hormonal therapy Hormone receptor Human epidermal growth factor receptor 2 Breast neoplasm Chemotherapy 

Notes

Acknowledgments

We thank Kathryn B. Carnes and Maude Veech from the Department of Scientific Publications at The University of Texas MD Anderson Cancer Center for the editorial review. This research was supported in part by the National Institutes of Health through MD Anderson’s Cancer Center Support Grant CA016672, by the Nellie B. Connally Breast Cancer Research Fund, by NIH Grant R01 CA123318, by the Morgan Welch Inflammatory Breast Cancer Research Program, and by the State of Texas Rare and Aggressive Breast Cancer Research Program Grant.

Conflict of interest

The authors have declared no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Naoki Hayashi
    • 1
    • 2
    • 3
  • Naoki Niikura
    • 2
    • 4
  • Hideko Yamauchi
    • 2
  • Seigo Nakamura
    • 2
    • 5
  • Naoto T. Ueno
    • 1
  1. 1.Department of Breast Medical Oncology, Unit 1354The University of Texas MD Anderson Cancer CenterHoustonUSA
  2. 2.Department of Breast Surgical OncologySt. Luke’s International HospitalTokyoJapan
  3. 3.Second Department of PathologyThe Showa University School of MedicineTokyoJapan
  4. 4.Department of Breast and Endocrine SurgeryTokai University School of MedicineKanagawaJapan
  5. 5.Department of Breast Surgical OncologyThe Showa University School of MedicineTokyoJapan

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