Implications of bone-only metastases in breast cancer: Favorable preference with excellent outcomes of hormone receptor positive breast cancer

Su Jin Lee, Silvia Park, Hee Kyung Ahn, Jun Ho Yi, Eun Yoon Cho, Jong Mu Sun, Jeong Eon Lee, Seok Jin Nam, Jung Hyun Yang, Yeon Hee Park, Jin Seok Ahn, Young Hyuck Im

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Purpose: The aim of the current study was to determine the incidence, clinical presentation, and treatment outcomes of "bone-only metastases" in patients with breast cancer and to analyze the impact of hormone receptor (HR) and human epidermal growth factor receptor 2 (HER2) status on prognosis. Materials and Methods: Between 1994 and 2007, of 968 patients with metastatic breast cancer who underwent palliative management at Samsung Medical Center, 565 (57%) relapsed with distant metastases. Of the 968, 146 (15%) had bone-only metastases during a median follow-up period of 75 months. Among the 146 patients with bone-only metastases, 122 (84%) were relapsed patients after curative surgery and 24 (26%) were initially metastatic cases. Results: The median time from primary surgery to bone-only metastases of the 122 patients was 37 months (95% confidence interval [CI], 27 to 46 months). Bone-only metastases were more common in the HR-positive group than in the other subtypes (85% for HR+; 8.2% for HER2+; 6.8%for triple negative. Among all 146 patients, 75 (51%) were treated with hormone therapy. The median post-relapse progression-free survival was 15 months (95%CI, 13 to 17 months). The median overall survival was much longer in the HR+ patients than the HER2+ and triple negative breast cancer patients with marginal statistical significance (65 vs. 40 vs. 40 months, p=0.077). Conclusion Breast cancer patients with "bone-only metastases" had excellent clinical outcomes. Further study is now warranted to reveal the underlying biology that regulates the behavior of this indolent tumor, as it should identify 'favorable tumor characteristics' in addition to 'favorable preferential metastatic site.'

Original languageEnglish
Pages (from-to)89-95
Number of pages7
JournalCancer Research and Treatment
Volume43
Issue number2
DOIs
StatePublished - Jun 2011

Keywords

  • Bone
  • Breast neoplasms
  • Estrogen receptors
  • Her2
  • Neoplasm metastasis
  • Progesterone receptors

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