Everolimus: a new hope for patients with breast cancer

Mehmet A N Sendur1, Nurullah Zengin, Sercan Aksoy

  • 1Ankara Numune Education and Research Hospital, Department of Medical Oncology , Ankara , Turkey.

Abstract

Insights

Everolimus shows promise in treating breast cancer by inhibiting the mTOR pathway, improving outcomes for patients resistant to standard therapies. Further research is exploring its use in earlier disease stages.

Area of Science:

  • Oncology
  • Pharmacology

Background:

  • Breast cancer can develop resistance to hormonal therapy and chemotherapy through mTOR pathway activation.
  • Everolimus, an mTOR inhibitor, has demonstrated improved outcomes when added to standard treatments in clinical trials.

Purpose of the Study:

  • To review the efficacy and safety data of everolimus in various breast cancer categories based on recent studies.
  • To discuss everolimus as a treatment strategy for endocrine therapy-resistant and HER2-targeted therapy-resistant breast cancer.

Main Methods:

  • Literature search of PubMed, ASCO, and San Antonio Breast Cancer Symposium abstracts.
  • Keywords used: 'everolimus', 'RAD001', 'mTOR inhibitor', 'breast cancer', 'endocrine therapy resistance', 'HER-2 targeted therapies'.
  • Data primarily from Phase I and II trials.

Main Results:

  • mTOR activation is implicated in breast cancer resistance across subgroups.
  • Everolimus combined with endocrine therapy (exemestane) showed efficacy in aromatase inhibitor-resistant metastatic breast cancer (MBC).
  • Everolimus plus trastuzumab and vinorelbine improved progression-free survival (PFS) in trastuzumab-resistant MBC.

Conclusions:

  • Everolimus demonstrates anti-tumor activity in combination therapies for HER2-positive and hormone-receptor-positive metastatic breast cancer.
  • Everolimus shows potential benefit in earlier disease stages, including adjuvant and neoadjuvant settings.

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