Hormonal therapy resistant estrogen-receptor positive metastatic breast cancer cohort (HORSE-BC) study: Current status of treatment selection in japan

Takayuki Iwamoto, Naruto Taira, Tomomi Fujisawa, Kazuhiro Araki, Kentaro Sakamaki, Takafumi Sangai, Yuichiro Kikawa, Tadahiko Shien, Shintaro Takao, Masako Sato, Yoshinari Goto, Takashi Yoshida, Masato Takahashi, Tomohiko Aihara, Hirofumi Mukai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The Hormonal therapy resistant estrogen-receptor positive metastatic breast cancer cohort (HORSE-BC) study is a multicenter observational study evaluating the efficacy and safety of secondary endocrine therapy (ET) for postmenopausal cases of metastatic breast cancer (MBC) with poor response to primary ET. In this initial report we analyze the HORSE-BC baseline data to clarify the current status of treatment selection for MBC in Japan. Baseline data for the 50 patients enrolled in HORSE-BC were analyzed, including patient characteristics, types of secondary ET, and reasons for selecting secondary ET. Postoperative recurrence was detected in 84% of patients (42/50) and de novo stage IV breast cancer in 16% (8/50). Forty-one patients (41/50; 82%) received fulvestrant, 5 patients (10%) received selective estrogen receptor modulators (SERMs), 3 patients (6%) received ET plus a mammalian target of rapamycin (mTOR) inhibitor, and 1 patient received an aromatase inhibitor (AI) as the secondary ET. Forty-five patients selected their secondary ET based on its therapeutic effect, while 14 patients selected it based on side effects. Most patients with progression after primary ET selected fulvestrant as the secondary ET based on its therapeutic and side effects. We await the final results from the HORSE-BC study.

Original languageEnglish
Pages (from-to)369-374
Number of pages6
JournalActa medica Okayama
Volume72
Issue number4
Publication statusPublished - 2018

Keywords

  • Breast cancer
  • Fulvestrant
  • Low sensitivity
  • Primary endocrine therapy
  • Secondary endocrine therapy

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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