Mammalian target of rapamycin (mTOR) antagonists

Hetty Carraway, Manuel Hidalgo

Research output: Contribution to journalReview articlepeer-review

88 Scopus citations


Mammalian target of rapamycin (mTOR) is a serine-threonine kinase member of the cellular phosphatidylinositol 3-kinase (PI3K) pathway, which is involved in multiple biologic functions such as transcriptional and translational control. mTOR is a downstream mediator in the PI3K/Akt signaling pathway and plays a critical role in cell survival. In breast cancer this pathway can be activated by membrane receptors, including the HER (or ErbB) family of growth factor receptors, the insulin-like growth factor receptor, and the estrogen receptor. There is evidence suggesting that Akt promotes breast cancer cell survival and resistance to chemotherapy, trastuzumab, and tamoxifen. Rapamycin is a specific mTOR antagonist that targets this pathway and blocks the downstream signaling elements, resulting in cell cycle arrest in the G1 phase. Targeting the Akt/PI3K pathway with mTOR antagonists may increase the therapeutic efficacy of breast cancer therapy.

Original languageEnglish (US)
Pages (from-to)219-224
Number of pages6
JournalBreast Cancer Research
Issue number5
StatePublished - Sep 2004
Externally publishedYes


  • CCI-779
  • Epidermal factor receptor
  • Mammalian target of rapamycin
  • PTEN
  • Phosphatidylinositol 3-kinase pathway

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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