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Biography

Zizheng Wang has completed his MD at the age of 35 years from Nanjing Medical University. He is the Director of Nanjing Nuclear Medicine Center, affi lated to Nanjing Medical University. His research was focused on receptor targeted tumor imaging and therapy with specifi c radiotracers such as radiolabelling NOTA-OC, DOTA-OC (somatostatin), RGD peptides (integrin αvβ3), folate analogue or derivants (folate), PSMA targeting peptides (prostate specifi c membrane antigen). He has get patents and tried his best to transform it into clinic. He has published more than 5 papers in reputed journals.

Abstract

This study was to investigate the value of integrin αvβ3 targeted microPET/CT imaging with 68Ga-DOTA-RGD2 as radiotracer for the detection of breast cancer osteolytic bone metastases. we prepared 68Ga-DOTA-RGD2 via one-step method. Animal model with Parathyroid hormone (PTH)–induced osteolysis in the calvarium was established and served as PTH Group (BP). Biodistribution study of 68Ga-DOTA-RGD2 was carried out in BP. Animals with injection of same volume of saline instead of PTH was served as Control group (BC). Integrin receptor block study was done with pre-injection of high dose of DOTARGD 2. 68Ga-DOTA-RGD2 and 18F-NaF microPET/CT imaging were perfromed respectively and radiotracer distribution were compared between BP and BC. Breast cancer osteolyic bone metastases was established via intrcardial injection of breast cancer cells (MDA-MB 231). 68Ga-DOTA-RGD2 microPET/CT imaging were perfromed for the detection of breast cancer osetolytic bone metastases. Animals were sacrifi ced and bone lesions were harvested for pathological examination. We found that 68Ga- DOTA-RGD2 was stable in vitro and its radiopurity was as high as (96.4±2.1)% 3h aft er its preparation. Its blood elimination was fast while its uptake by the liver and kidneys were relatively low. It was discharged soon aft er its intravenous injection. In the BP group, regional uptake of 68Ga-DOTA-RGD2 in osteolytic lesion of calvarium (%ID/g) reached peak (5.14±0.65 ) 60 min aft er tail vein injection. It was signifi cantly more than that in BC group (2.06±0.35,t=7.81,P<0.05). Bone radiotracer uptake ratio of osteolytic lesion to normal calvrium (O/N)was compared based microPET/CT imaging. Bone O/N of 68Ga-DOTARGD 2 was (6.1±0.97), signifi cantly greater than that of 18F-NaF (1.2±0.33,t=10.17, P<0.05). 68Ga-DOTA-RGD2 microPET/CT imaging was able to demonstrate the ostelytic bone metastasis in calvarium, thoracic vertebrae and lung metastasis. Th ey were confi rmed by pathology results. According to our results, 68Ga-DOTA-RGD2, as new integrinαvβ3 receptor targeting radiotracer, was potential for positive imaging and early detection of oseolytic lesion or breast cancer osteolytic bone metastasis.


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