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Endocrine therapy: defining the path of least resistance

Andrew Stone1, Elizabeth A Musgrove2

  • 1Cancer Epigenetics Program, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, 2010, NSW, Australia. a.stone@garvan.org.au.

Breast Cancer Research : BCR
|May 1, 2015
PubMed

Insights

Aberrant phosphatidylinositol-3-kinase signaling is common in endocrine-resistant breast cancer. New research suggests genetic anomalies in this pathway may predict resistance and link to breast cancer stem cells.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Aberrant activation of the phosphatidylinositol-3-kinase (PI3K), protein kinase B (PKB), and mammalian target of rapamycin (mTOR) signaling pathway is a hallmark of many cancers, including breast cancer.
  • This pathway dysregulation is frequently observed in endocrine-resistant breast cancer and breast cancer stem cells, often due to specific genetic lesions or amplification of pathway components.

Discussion:

  • The study explores two key hypotheses: whether genetic anomalies in the PI3K/PKB/mTOR pathway serve as predictive biomarkers for endocrine resistance in breast cancer, and if tamoxifen-resistant breast cancer cells originate from a stem-like cell population.
  • These hypotheses are investigated in the context of recent findings published in Breast Cancer Research, suggesting a potential intrinsic link between them.

Key Insights:

  • Genetic lesions or amplification within the PI3K/PKB/mTOR pathway are implicated in both endocrine resistance and breast cancer stem cell populations.
  • The research raises the possibility that these genetic anomalies could serve as predictive biomarkers for endocrine resistance.
  • A potential link is proposed between the emergence of tamoxifen-resistant breast cancer cells and the stem-like cell population.

Outlook:

  • Further investigation is warranted to validate the predictive value of PI3K/PKB/mTOR pathway genetic anomalies as biomarkers for endocrine resistance.
  • Understanding the relationship between these genetic alterations, stem-like cells, and tamoxifen resistance could lead to novel therapeutic strategies for difficult-to-treat breast cancers.
  • This research opens avenues for developing targeted therapies aimed at overcoming endocrine resistance by targeting the PI3K/PKB/mTOR pathway and associated stem cell characteristics.

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