BARC/PUB/2015/1379

 
 

Integrin αvβ3 as a Promising Target to Image Neoangiogenesis Using In-House Generator-Produced Positron Emitter 68Ga-Labeled DOTA-Arginine-Glycine-Aspartic Acid (RGD) Ligand

 
     
 
Author(s)

Vatsa, R.; Bhusari, P.; Kumar, S.; Chakraborty, S.; Dash, A.; and others
(IA&RPhD)

Source

Cancer Biotherapy & Radiopharmaceuticals, 2015. Vol. 30 (5): pp. 217-224

ABSTRACT

For the growth and spread of a tumor beyond 2 mm, angiogenesis plays a crucial role, and association of various integrins with angiogenesis is evidential. The aim of the study was radiolabeling of DOTA-chelated RGD (arginine-glycine-aspartic acid) peptide with 68Ga for PET imaging in locally advanced breast carcinoma. DOTA-RGD was incubated with 68GaCl3, eluted in 0.05m HCl. Elution volume, peptide amount, and reaction pH were studied. Radio-ITLC, gas chromatography, endotoxin, and sterility testing were performed. Serial (n = 3) and whole-body (n = 2) PET/CT imaging was done on patients post i.v. injection of 111–185MBq of 68Ga-DOTA-RGD. Maximum radiolabeling yield was achieved with 3mL elution volume of 15–20 µg peptide at pH 3.5–4.0 with 10 minutes of incubation at 95°C. Product samples were sterile having 99.5% radiochemical purity with residual ethanol content and endotoxins in injectable limits. Intense radiotracer uptake was noticed in the tumor with SUVmax 15.3 at 45 minutes in serial images. Physiological radiotracer uptake was seen in the liver, spleen, ventricles, and thyroid with excretion through the kidneys. The authors concluded that 68Ga-DOTA-RGD has the potential for imaging α,vβ3 integrin-expressing tumors.  

 
 
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