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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Updated: May 29, 2025

Predictive Immune Modeling of Solid Tumors
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Neoplastic immune mimicry potentiates breast tumor progression.

Eric B Berens, Sokchea Khou, Elaine Huang

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    Breast cancer cells can adopt an "immune mimicry" program, expressing leukocyte receptors. This dedifferentiation is linked to aggressive tumors, treatment resistance, and increased metastasis risk.

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    Area of Science:

    • Oncology
    • Cell Biology
    • Immunology

    Background:

    • Breast cancer progression involves dedifferentiation, increasing tumor cell adaptability and aggressiveness.
    • This cellular plasticity correlates with resistance to therapies and enhanced metastatic potential.

    Purpose of the Study:

    • To identify and characterize a novel cellular program in neoplastic breast epithelial cells termed "immune mimicry."
    • To investigate the association of immune mimicry with breast cancer aggressiveness, treatment resistance, and clinical outcomes.

    Main Methods:

    • Analysis of single-cell RNA-seq datasets from human breast tumors.
    • Histopathological examination of breast tumor specimens.
    • In vitro studies using breast cancer cell lines and in vivo studies using murine cancer models.
    • Assessment of chemotherapy-induced changes in epithelial cells.

    Main Results:

    • Subpopulations of dedifferentiated breast cancer cells express leukocyte cell surface receptors, exhibiting "immune mimicry."
    • Immune-mimicked cells show hallmarks of dedifferentiation and are prevalent in high-grade, treatment-resistant tumors.
    • Cytotoxic chemotherapy treatment induced immune mimicry in aggressive breast cancer cell lines.
    • Expression of CD69 (a leukocyte activation protein) by neoplastic cells conferred a proliferative advantage.

    Conclusions:

    • Neoplastic breast epithelial cells upregulating leukocyte surface receptors potentiate malignancy.
    • Immune mimicry is associated with aggressive breast cancer phenotypes, including therapeutic resistance and metastatic potential.
    • Neoplastic immune mimicry warrants evaluation for prognostic utility in stratifying breast cancer patients at high risk.