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Prognostic factors of HER2-positive breast cancer patients who develop brain metastasis: a multicenter retrospective analysis

  • Epidemiology
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Abstract

The clinical course and prognostic factors of HER2-positive breast cancer patients with brain metastases are not well known because of the relatively small population. The aim of this study was to determine prognostic factors associated with HER2-positive patients who develop brain metastases. This retrospective study assessed the largest dataset to date of 432 HER2-positive patients who were diagnosed with brain metastases from 24 institutions of the Japan Clinical Oncology Group, Breast Cancer Study Group. The median age of the 432 patients was 54 years (range, 20–86 years). Of the patients, 162 patients (37.5 %) had ER-positive/HER2-positive (ER+HER2+) breast cancer, and 270 (62.5 %) had ER-negative/HER2-positive (ER−HER2+) breast cancer. The median brain metastasis-free survival period from primary breast cancer was 33.5 months in both groups. The median survival after developing brain metastasis was 16.5 and 11.5 months in the ER+HER2+ and ER−HER2+ groups, respectively, (p = 0.117). Patients with >3 brain metastases had significantly shorter overall survival in both ER+HER2+ (p < 0.001) and ER−HER2+ (p = 0.018) groups. Treatment with trastuzumab before developing brain metastases was not associated with survival duration after developing brain metastases (p = 0.571). However, patients treated with both trastuzumab and lapatinib after developing metastasis had significantly longer survival than patients treated with trastuzumab alone, lapatinib alone, or no HER2-targeting agent (p < 0.001). For HER2-positive patients with brain metastases, regardless of the use of trastuzumab before developing brain metastasis, treatment with both trastuzumab and lapatinib might improve survival.

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Acknowledgments

We would like to thank the following people for providing us with the data of patients with brain metastases: Yasuyuki Sato, Nagoya Medical Center; Yoshimasa Kosaka, Kitasato University School of Medicine; Tsutomu Iwasa, Kinki University School of Medicine; Hiroyasu Yamashiro, Kure Medical Center/Chugoku Cancer Center; Tadahiko Shien; Okayama University Hospital; Kazuya Miyoshi, NHO Fukuyama Medical Center; Anan Keisei, Kitakyushu Municipal Medical Center, Department of Surgery; Hitoshi Arioka, Yokohama Rosai Hospital; and Maeda Shigeto, National Nagasaki Medical Center. This study was supported by the National Cancer Center Research and Development Fund (23-A-17) and the Health and Labour Sciences Research Expenses for Commision Fund for Applied Research for Innovative Treatment of Cancer (H26-applied-general-046).

Conflict of interest

Naoki Niikura belongs to the Endowed Chair Department of Chugai Co. Ltd. Hiroji Iwata has received a honorarium from Chugai Co. Ltd and GlaxoSmithKline. Other authors have no conflicts of interest to declare.

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Hayashi, N., Niikura, N., Masuda, N. et al. Prognostic factors of HER2-positive breast cancer patients who develop brain metastasis: a multicenter retrospective analysis. Breast Cancer Res Treat 149, 277–284 (2015). https://doi.org/10.1007/s10549-014-3237-7

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