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Related Experiment Videos

Model based calculation for effective cancer radioimmunotherapy

A R Attard1, M J Chappell, A R Bradwell

  • 1Department of Immunology, University of Birmingham Medical School, UK.

The British Journal of Radiology
|June 1, 1995
PubMed
Summary

Optimizing radioimmunotherapy requires high-affinity intact antibodies for effective tumor irradiation. Antibody fragments lead to higher body radiation, making whole antibodies a better choice for targeted cancer treatment.

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Limiting factors in the localization of tumours with radiolabelled antibodies.

Immunology today·2014

Area of Science:

  • Oncology
  • Nuclear Medicine
  • Biomedical Engineering

Background:

  • Tumor radioimmunotherapy faces challenges due to low antibody uptake, limiting tumor irradiation.
  • Previous non-linear compartmental models quantified antibody distribution and uptake characteristics.

Purpose of the Study:

  • To extend a compartmental model to calculate tumor/body radiation dose for various antibody properties.
  • To determine antibody requirements for delivering 60 Gy to tumors using 131I and 90Y-labeled antibodies.

Main Methods:

  • Utilized an extended non-linear compartmental model combined with MIRD dosimetry.
  • Calculated integral tumor/body radiation dose for different antibody masses, sizes, and affinities.
  • Assessed antibody requirements for specific dose delivery over 11.6 days, considering dose rates.

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Main Results:

  • High-affinity intact antibodies (10(11)-10(13) mol-1) achieved effective tumor doses with acceptable body radiation.
  • Antibody fragments resulted in higher body radiation levels and increased injected activity due to renal excretion.
  • The model predicted superior therapeutic indices for 90Y-labeled antibodies compared to 131I-labeled antibodies.

Conclusions:

  • Intact antibodies with high affinity are crucial for effective radioimmunotherapy.
  • 90Y-labeled antibodies offer a potentially higher therapeutic index than 131I-labeled antibodies.
  • Model predictions guide the selection of optimal antibodies for enhanced tumor targeting and reduced systemic toxicity.