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EPR: Evidence and fallacy.

Joseph W Nichols1, You Han Bae2

  • 1University of Utah, Department of Bioengineering, College of Engineering, Salt Lake City, 84112, USA.

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PubMed
Summary
This summary is machine-generated.

The enhanced permeability and retention (EPR) effect in tumors is less reliable for nanoparticle drug delivery than previously believed. Clinical outcomes show EPR-dependent delivery often fails, necessitating case-by-case evaluation for specific tumor types.

Keywords:
Clinical efficacyDrug deliveryEnhanced permeability and retentionIntratumoral distributionTumor models

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Area of Science:

  • Oncology
  • Nanotechnology
  • Pharmacology

Background:

  • The enhanced permeability and retention (EPR) phenomenon has been a cornerstone of nanoparticle-based cancer drug delivery research.
  • It proposes preferential accumulation of nanoparticles in tumors due to leaky vasculature and impaired lymphatic drainage.
  • This principle justified the development of nano-sized drug carriers for improved therapeutic outcomes.

Observation:

  • Despite preclinical promise, clinical trials reveal that EPR-dependent nanoparticle systems often do not outperform conventional free drug delivery.
  • Tumor interstitial fluid pressure, heterogeneous vascularization, and poor blood flow impede effective nanoparticle penetration.
  • Significant differences exist between animal models and human tumors, potentially exaggerating the EPR effect in preclinical studies.

Findings:

  • The clinical efficacy of nanoparticle drug delivery systems is not consistently enhanced by the EPR effect.
  • Factors such as high interstitial fluid pressure and irregular tumor vasculature complicate EPR-mediated delivery.
  • Discrepancies between animal models and human tumors limit the translatability of EPR-based strategies.

Implications:

  • The EPR effect's reliability in cancer therapy is questionable and should not be universally applied.
  • Future nano-drug delivery strategies require careful consideration of individual tumor characteristics and clinical evidence.
  • A more nuanced, case-by-case approach is needed, validating EPR-based delivery only in susceptible tumor types.