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The female breast is a hemispheric projection of variable size positioned anterior to the pectoralis major and serratus anterior muscles. A fascia layer composed of dense, irregular connective tissue connects it to these muscles.
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Initiation of Metastatic Breast Carcinoma by Targeting of the Ductal Epithelium with Adenovirus-Cre: A Novel Transgenic Mouse Model of Breast Cancer
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MPA/DMBA-driven mammary carcinomas.

Aitziber Buqué1, Maria Perez-Lanzón2, Giulia Petroni1

  • 1Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, United States.

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|March 31, 2021
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Summary
This summary is machine-generated.

This study establishes a mouse model for luminal B breast cancer using 7,12-dimethylbenz[a]anthracene (DMBA) and medroxyprogesterone (MPA). The model mimics human cancer features, offering a valuable preclinical platform for research.

Keywords:
ChemotherapyImmunotherapyKRASPI3KRadiation therapyTargeted anticancer agents

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Area of Science:

  • Oncology
  • Immunology
  • Preclinical Models

Background:

  • Human luminal B breast cancer is a significant health concern.
  • Existing preclinical models may not fully recapitulate its immunobiological features.
  • Understanding the immune microenvironment is crucial for effective treatment.

Purpose of the Study:

  • To develop a reliable preclinical model for luminal B breast cancer.
  • To characterize the immunobiological features of this novel model.
  • To provide a detailed protocol for establishing the model in mice.

Main Methods:

  • Administration of 7,12-dimethylbenz[a]anthracene (DMBA) and medroxyprogesterone (MPA) pellets in wild-type female mice.
  • Characterization of mammary carcinomas for hormone receptor expression and immune infiltrate.
  • Assessment of sensitivity to CDK4/CDK6 inhibitors and PD-1 immunotherapy.

Main Results:

  • DMBA/MPA treatment induced mammary carcinomas with features of human luminal B breast cancer.
  • The tumors expressed hormone receptors and exhibited an immunosuppressive immune microenvironment.
  • The model demonstrated sensitivity to CDK4/CDK6 inhibitors but resistance to PD-1 blockade.

Conclusions:

  • The DMBA/MPA-driven mouse model is a valuable preclinical platform for studying luminal B breast cancer.
  • This model recapitulates key immunobiological aspects of human disease.
  • The protocol is adaptable for various mouse genetic backgrounds, facilitating broader research applications.