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Updated: Sep 26, 2025

Y-90 Radioembolization and PD-1 Inhibitor as Neoadjuvant Treatment in Hepatocellular Carcinoma
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Y-90 Radioembolization and PD-1 Inhibitor as Neoadjuvant Treatment in Hepatocellular Carcinoma

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Optimizing 90Y Particle Density Improves Outcomes After Radioembolization.

Aaron W P Maxwell1, Humberto G Mendoza2, Matthew J Sellitti3

  • 1Department of Diagnostic Imaging, The Warren Alpert Medical School, Brown University, Providence, RI, USA.

Cardiovascular and Interventional Radiology
|April 23, 2022
PubMed
Summary
This summary is machine-generated.

Optimizing particle density in radioembolization improves treatment outcomes. Tailoring particle delivery based on tumor vascularity enhances local progression-free survival and overall survival, outperforming conventional dosimetry.

Keywords:
DosimetryEmbolizationMicrodosimetryRadioembolizationTumor vascularity

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Area of Science:

  • Interventional Radiology
  • Nuclear Medicine
  • Oncology

Background:

  • Lobar radioembolization uses microspheres to deliver radiation directly to liver tumors.
  • Particle density influences radiation dose distribution and treatment efficacy.
  • Understanding the relationship between particle density, dose, and outcomes is crucial for optimizing therapy.

Purpose of the Study:

  • To investigate the impact of particle density on dose distribution and patient outcomes in lobar radioembolization.
  • To compare outcomes between glass and resin microspheres based on particle density.

Main Methods:

  • Retrospective study of 114 matched patients treated with glass versus resin microspheres.
  • Analysis of tumor and liver particle density (particles/cm³), and radiation dose (Gy).
  • Utilized 99mTc-MAA SPECT/CT and 90Y bremsstrahlung SPECT/CT for dose assessment and microdosimetry simulations to calculate cold spot doses.

Main Results:

  • Increased particle delivery led to more uniform 90Y doses, reducing differences between tumor and liver doses.
  • Optimal particle density, tailored to tumor vascularity (hypervascular vs. less vascular), improved local progression-free survival (LPFS).
  • Optimized particle density significantly improved overall survival (11.5 vs. 6.8 months) and microdosimetry predictions compared to conventional dosimetry.

Conclusions:

  • Particle density can be adjusted based on tumor vascularity to maximize tumor dose and minimize liver dose.
  • Optimizing particle density is a key factor in improving LPFS and overall survival in radioembolization.
  • Microdosimetry offers superior prediction of treatment outcomes compared to conventional dosimetry.