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Unlocking the Tumor Microenvironment: Innovations in Multiplex Immunohistochemistry.

Bipin Gupta1, George Yang1, Marc Key2

  • 1Diagnostic Biosystems, Pleasanton, CA 94588, USA.

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|November 26, 2025
PubMed
Summary
This summary is machine-generated.

This study shows a new multiplex staining method to identify immune cells like B-cells, T-cells, and macrophages in breast cancer tissue. The method helps visualize immune infiltrates and their patterns around tumors.

Keywords:
immune cellsimmunohistochemistryinflammationmultiplex stainingtumor microenvironment

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Area of Science:

  • Immunology
  • Oncology
  • Pathology

Background:

  • Immune cell infiltration in tumors is crucial for cancer growth and treatment response.
  • Understanding the spatial distribution of immune cells within the tumor microenvironment is vital.

Purpose of the Study:

  • To demonstrate a feasible multiplex immunohistochemistry method for identifying immune cell markers in breast cancer.
  • To characterize the infiltration patterns of B-cells, T-cells, and macrophages in relation to tumor compartments and tertiary lymphoid structures.

Main Methods:

  • Utilized standard immunohistochemistry with novel chromogens for multiplex staining.
  • Employed antibodies against CD20 (B-cells), CD3 (T-cells), CD163 (macrophages), cytokeratin (tumor identification), and Ki67 (proliferation index).
  • Visual examination was used to differentiate up to five markers.

Main Results:

  • Significant immune cell infiltration was observed surrounding and within breast tumors.
  • B-cells, T-cells, and macrophages were abundant at the tumor periphery, often near tertiary lymphoid structures.
  • B-cells were reduced within the tumor interior, while T-cells and macrophages showed abundant infiltration.

Conclusions:

  • The developed multiplex staining method is feasible for visualizing immune infiltrates in breast cancer.
  • Distinct patterns of immune cell infiltration exist, with differential distribution of B-cells, T-cells, and macrophages within and around tumors.
  • Simple visual analysis can suffice for differentiating multiple immune markers in complex tissue samples.