Quantitative PET imaging of VEGF receptor expression

Area of Science:

• Oncology
• Radiochemistry
• Molecular Imaging

Background:

• Vascular endothelial growth factor (VEGF)/VEGF receptor (VEGFR) signaling is crucial for tumor angiogenesis.
• Quantitative positron emission tomography (PET) imaging of VEGFR can guide anti-angiogenic therapy.
• Accurate VEGFR imaging is needed for treatment planning and monitoring.

Purpose of the Study:

• To develop and validate a quantitative PET imaging tracer for VEGFR.
• To assess the correlation between PET imaging and VEGFR expression in tumors.
• To evaluate the potential of this imaging method for cancer treatment management.

Main Methods:

• Conjugation of VEGF(121) with DOTA and labeling with (64)Cu.
• PET imaging of mice bearing human glioblastoma U87MG tumors of varying sizes.
• Validation of imaging results using Western blotting and immunofluorescence staining.

Main Results:

• The (64)Cu-DOTA-VEGF(121) tracer showed optimal tumor uptake in 100-250 mm(3) tumors.
• PET imaging uptake correlated linearly with VEGFR-2 expression (r(2)=0.68).
• Histology confirmed the imaging findings.

Conclusions:

• (64)Cu-DOTA-VEGF(121) PET imaging accurately reflects in vivo tumor VEGFR-2 expression.
• This imaging approach can aid in planning and monitoring cancer therapies.
• Potential applications extend to other angiogenesis-related diseases.