Cited by 1,627PI3K/AKT/mTOR signaling in cancerHER2/EGFR in Cancer ResearchBreast Cancer Treatment Studies

A functional genetic approach identifies the PI3K pathway as a major determinant of trastuzumab resistance in breast cancer

Open access
Berns, Katrien, Horlings, Hugo M., Hennessy, Bryan T., Madiredjo, Mandy, Hijmans, E. Marielle, Beelen, Karin, Linn, Sabine C., Gonzalez-Angulo, Ana Maria +6 more·2007·Cancer Cell

Abstract

A large-scale RNA interference screen to discover genes involved in trastuzumab resistance in breast cancer identified only PTEN as a modulator of drug sensitivity. Oncogenic mutants of PIK3CA (activator of the same pathway and frequently mutated in breast cancer) also conferred resistance to trastuzumab in cell culture. In a cohort of 55 breast cancer patients, activation of the PI3K pathway, as judged by the presence of oncogenic PIK3CA mutations or low PTEN expression, was associated with poor prognosis after trastuzumab therapy, and the combined analysis of PTEN and PIK3CA identified twice as many patients at increased risk for progression compared to PTEN alone. Thus, assessment of PI3K pathway activation may provide a biomarker to identify patients unlikely to respond to trastuzumab-based therapy.

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Registry

Crossref · 10.1016/j.ccr.2007.08.030

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  • Patients with 'hot spot' PIK3CA mutations and undetectable or low PTEN measured by IHC exhibited a poorer outcome after treatment with chemotherapy and trastuzumab compared to patients without those alterations.

    “Patients with ‘hot spot’ PIK3CA mutations and undetectable or low PTEN measured by IHC, exhibited a poorer outcome after treatment with chemotherapy and trastuzumab compared to patients without those alterations (Berns et al., 2007; Dave et al., 2011; Esteva et al., 2010).”
  • Using a large-scale siRNA genetic screen, PTEN was identified as the only gene whose knockdown conferred trastuzumab resistance.

    “Using a large-scale siRNA genetic screen, they identified PTEN as the only gene whose knockdown conferred trastuzumab resistance (Berns et al., 2007).”

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Authors
Berns, K., Horlings, H. M., Hennessy, B. T., Madiredjo, M., Hijmans, E. M., Beelen, K., Linn, S. C., Gonzalez-Angulo, A. M., Stemke-Hale, K., Hauptmann, M., Beijersbergen, R. L., Mills, G. B., van de Vijver, M. J., & Bernards, R.
Affiliations
  • The Netherlands Cancer Institute (NL)
  • The University of Texas MD Anderson Cancer Center (US)
Corresponding author
Bernards, René
Venue
Cancer Cell
Publisher
Elsevier BV
Published
2007-10
Volume
12
Issue
4
Pages
395-402
ISSN
1535-6108 (ISSN-L)
OpenAlex
W2020372547
Cited by
1,627
References
22
Citations by year
2026: 26 · 2025: 44 · 2024: 33 · 2023: 81 · 2022: 69 · 2021: 54 · 2020: 63 · 2019: 70 · 2018: 88 · 2017: 74 · 2016: 102 · 2015: 116 · 2014: 118 · 2013: 144 · 2012: 123
FWCI
37.98
Type
journal article
Language
en
Open access
Locations
  • Cancer Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Pure Amsterdam UMC (submittedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Breast Cancer Treatment Studies
Keywords
trastuzumab resistance, breast cancer, PI3K signaling, PTEN, PIK3CA mutation, RNAi screen, drug sensitivity, prognostic factors, HER2-positive breast cancer, treatment response prediction
MeSH terms
Trastuzumab, Adult, Aged, Antibodies, Monoclonal, Antineoplastic Agents, Breast Neoplasms, Female, Humans, Middle Aged, Mutation, Transduction, Genetic, Biomarkers, Tumor, Cohort Studies, Signal Transduction, Gene Expression Regulation, Neoplastic, Treatment Outcome, Disease Progression, Patient Selection, Erb-b2 Receptor Tyrosine Kinases, Drug Resistance, Neoplasm, Phosphatidylinositol 3-Kinases, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, RNA Interference, RNA, Small Interfering, Cell Line, Tumor, PTEN Phosphohydrolase, Kaplan-Meier Estimate, Class I Phosphatidylinositol 3-Kinases, Antibodies, Monoclonal, Humanized

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