Toward realization of 'mix-and-use' approach in ⁶⁸Ga radiopharmacy: preparation, evaluation and preliminary clinical utilization of ⁶⁸Ga-labeled NODAGA-coupled RGD peptide derivative.

Abstract:

INTRODUCTION:The present article demonstrates a 'mix-and-use' approach for radiolabeling RGD peptide derivative with (68)Ga, which is easily adaptable in hospital radiopharmacy practice. The radiotracer thus formulated was successfully used for positron emission tomography (PET) imaging of breast cancer in human patients. METHODS:The conditions for radiolabeling NODAGA-coupled dimeric cyclic RGD peptide derivative [NODAGA-(RGD)2] with (68)Ga were optimized using (68)Ga obtained from a (68)Ge/(68)Ga generator developed in-house with CeO2-PAN composite sorbent as well as from a commercial (68)Ge/(68)Ga generator obtained from ITG, Germany. Preclinical studies were carried out in C57BL/6 mice bearing melanoma tumors. The radiotracer was prepared in a hospital radiopharmacy using (68)Ga obtained from ITG generator and used for monitoring breast cancer patients by positron emission tomography (PET) imaging. RESULTS:(68)Ga-NODAGA-(RGD)2 could be prepared with high radiolabeling yield (>98%) and specific activity (~50 GBq/μmol) within 10 min at room temperature by mixing (68)Ga with the solution of the peptide conjugate. In vivo biodistribution studies showed significant uptake (5.24±0.39% ID/g) in melanoma tumor at 30 min post-injection, with high tumor-to-background contrast. The integrin αvβ3 specificity of the tracer was corroborated by blocking study. Preliminary clinical studies in locally advanced breast cancer (LABC) patients indicated specifically high tumor uptake (SUVmax 10-15) with good contrast. CONCLUSIONS:This is one of the very few reports which presents preliminary clinical data on use of (68)Ga-NODAGA-(RGD)2 and the developed 'mix-and-use' holds tremendous prospect in clinical PET imaging using (68)Ga.

journal_name

Nucl Med Biol

authors

Chakraborty S,Chakravarty R,Vatsa R,Bhusari P,Sarma HD,Shukla J,Mittal BR,Dash A

doi

10.1016/j.nucmedbio.2015.09.010

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

116-123

issue

1

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(15)00169-9

journal_volume

43

pub_type

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