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Related Experiment Video

Updated: Jan 27, 2026

Studying Triple Negative Breast Cancer Using Orthotopic Breast Cancer Model
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Metformin and Breast Cancer: Molecular Targets.

J Faria1, G Negalha1, A Azevedo1

  • 1Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal.

Journal of Mammary Gland Biology and Neoplasia
|March 24, 2019
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Metformin, a common diabetes drug, shows potential in reducing breast cancer risk and mortality. This review explores its molecular mechanisms against cancer cells, independent of diabetes status.

Keywords:
AMPKBreast cancerDiabetesMetforminmTOR

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Area of Science:

  • Oncology
  • Pharmacology
  • Endocrinology

Background:

  • Metformin is a widely prescribed antihyperglycemic drug for type II diabetes.
  • Retrospective studies suggest metformin use is linked to reduced cancer incidence and mortality.
  • The molecular mechanisms of metformin's action in cancer cells are not fully understood.

Purpose of the Study:

  • To review the molecular evidence elucidating metformin's mode of action against breast cancer cells.
  • To explore metformin's potential role in breast cancer prevention and treatment.
  • To clarify the controversial aspects of metformin's anti-cancer effects.

Main Methods:

  • Review of existing scientific literature on metformin's molecular targets and effects in cancer.
  • Analysis of studies investigating the link between diabetes, metformin use, and breast cancer risk.
  • Synthesis of data on both AMPK-dependent and AMPK-independent pathways.

Main Results:

  • Metformin is associated with reduced breast cancer risk, irrespective of diabetes status.
  • Key molecular targets include mitochondrial complex I, AMP-activated protein kinase (AMPK), and mTORC1.
  • Evidence for AMPK-independent effects of metformin in cancer cells exists.

Conclusions:

  • Metformin demonstrates a significant reduction in breast cancer risk.
  • Further research is needed to fully elucidate metformin's complex molecular mechanisms in combating breast cancer.
  • Metformin holds promise as a potential therapeutic or preventative agent in oncology.