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Micropharmacology Beyond Target Expression: Mapping Barriers to Intra-Tumoral Drug Delivery

Hartland Jackson1

  • 1Lunenfeld-Tanenbaum Research Institute Toronto Canada.

Cancer Research
|August 5, 2026
PubMed

Insights

High dimension spatial proteomics revealed significant variability in antibody drug distribution within tumors. This heterogeneity, influenced by factors like stromal barriers and vascularization, presents challenges for effective cancer therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biotechnology

Background:

  • High-dimension spatial technologies map cancer's cellular and molecular landscape, identifying targets but not drug distribution.
  • Spatial heterogeneity of target proteins is known, but quantifying therapeutic drug penetration remains a challenge.

Purpose of the Study:

  • To apply highly multiplexed spatial proteomics to quantify drug distribution in patient tumors treated with antibody therapeutics.
  • To identify factors influencing drug penetration and distribution at the single-cell level.

Main Methods:

  • Utilized highly multiplexed spatial proteomics on tumor samples from patients receiving fluorescently labeled antibody therapeutics.
  • Quantified drug penetration and distribution on cells with specific phenotypes.

Main Results:

  • Identified significant variability in antibody drug distribution between patients and within individual tumors.
  • Factors such as macrophage uptake, stromal barriers, vascularization, and epithelial permeability were associated with altered drug distribution.
  • Highly desmoplastic pancreatic cancers and fibroblast/extracellular matrix-rich head and neck squamous cell carcinomas (HNSCCs) showed poor drug delivery.

Conclusions:

  • Spatial proteomics provides a measurement strategy for single-cell drug distribution.
  • Understanding these barriers is crucial for precision medicine and designing improved antibody therapeutics.
  • Variability in drug distribution poses a significant challenge to therapeutic success.

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