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Related Experiment Video

Updated: Feb 5, 2026

Studying Triple Negative Breast Cancer Using Orthotopic Breast Cancer Model
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ITGB1 Regulates Triple-Negative Breast Cancer Development by Modulating the Tumor Microenvironment.

Nuozi Song1, Siqi Chen1, Lei Wang2

  • 1Department of Immuno-Oncology, Beckman Research Institute, City of Hope, Duarte, California, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 3, 2026
PubMed
Summary

Tumorigenesis involves complex interactions within the tumor microenvironment (TME). Researchers identified tumor-intrinsic integrin beta 1 (ITGB1) as a key regulator in triple-negative breast cancer (TNBC), offering a new therapeutic target.

Keywords:
CRISPR screenITGB1R1 domainTNBCtumor‐associated macrophages

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Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Tumorigenesis and metastasis are driven by cancer cell and tumor microenvironment (TME) interactions.
  • Understanding cancer-immune crosstalk in the TME is crucial for effective immunotherapy development.

Purpose of the Study:

  • To identify key regulators of triple-negative breast cancer (TNBC) development within the TME.
  • To elucidate the mechanisms by which tumor-intrinsic integrin beta 1 (ITGB1) influences TNBC progression and the TME.

Main Methods:

  • In vivo CRISPR screens were employed to identify critical genes in TNBC development.
  • Functional characterization of ITGB1's role in orchestrating tumor-associated myeloid populations.
  • Development and testing of an antibody targeting a novel ITGB1 functional domain.

Main Results:

  • Tumor-intrinsic ITGB1 was identified as a critical regulator of TNBC.
  • Suppression of ITGB1 promoted anti-tumorigenic myeloid cells and enhanced CD4/CD8 T cell infiltration.
  • A novel ITGB1 functional domain was discovered, essential for its pro-tumorigenic activity, and its blockade impaired TNBC progression.

Conclusions:

  • Tumoral ITGB1 reprogramming offers a therapeutic strategy for inhibiting TNBC by shifting the TME from pro- to anti-tumorigenic.
  • Targeting the novel ITGB1 domain with an antibody presents a promising approach for TNBC treatment.