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Optimizing Glioma Detection Using an EGFR-Targeted Fluorescent Affibody

Ana Luiza Ribeiro de Souza1,2, Kayla Marra1, Jason Gunn1

  • 1Thayer School of Engineering, Dartmouth College, Hanover, NH.

Photochemistry and Photobiology
|August 22, 2018
PubMed

Insights

Optimizing glioma detection requires doses of fluorescent Affibody ABY-029 exceeding the FDA

Area of Science:

  • Oncology
  • Molecular Imaging
  • Pharmacokinetics

Background:

  • Epidermal Growth Factor Receptor (EGFR) is overexpressed in many cancers, making it a target for diagnosis and therapy.
  • EGFR-targeted fluorescent Affibody (ABY-029) shows potential for glioma detection.
  • Understanding uptake kinetics is crucial for optimizing tumor detection efficacy.

Purpose of the Study:

  • To investigate the uptake kinetics of ABY-029 for glioma detection.
  • To evaluate the impact of ABY-029 dose and cetuximab administration on tumor-to-normal brain contrast.
  • To determine the optimal dosage for effective glioma detection using ABY-029.

Main Methods:

  • U251 glioma cells were implanted in nude rats.
  • Fluorescence imaging of rat brains after ABY-029 administration.
  • Ex vivo imaging to analyze tumor-to-normal brain ratios at varying ABY-029 doses and with/without cetuximab.

Main Results:

  • Cetuximab blocked ABY-029 binding to EGFR in cell culture but did not affect tumor-to-normal brain contrast in vivo.
  • Ex vivo imaging demonstrated increased tumor-to-normal brain ratios with higher ABY-029 doses.
  • A saturation value was reached at 245 μg kg⁻¹, a 10-fold increase over the microdose.

Conclusions:

  • Glioma detection is optimized when ABY-029 dosage surpasses the FDA-defined microdose.
  • The dose of ABY-029 is a critical factor for effective tumor visualization.
  • Concurrent cetuximab administration did not enhance tumor contrast in this model.

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