Estimation of Human Absorbed Dose of 188Re-Hynic-Bombesin Based on Biodistribution Data in Rats

Background: HYNIC-Bombesin (BBN) is a potential peptide for targeted radionuclide therapy in gastrin-releasing peptide receptor (GRPr)-positive malignancies. The 188Re-HYNICBBN is a promising radiopharmaceutical for use in prostate cancer therapy. Objective: The aim of this study was to estimate the absorbed dose due to 188Re-HYNIC-BBN radio-complex in human organs based on bio-distribution data of rats. Methods: In this research, using bio-distribution data of 188Re-HYNIC-BBN in rats, its radiation absorbed dose of the adult human was calculated for different organs based on the MIRD dose calculation method. Results: A considerable equivalent dose amount of 188Re-Hynic-BBN (0.093 mGy/MBq) was accumulated in the prostate. Moreover, all other tissues except for the kidneys and pancreas approximately received insignificant absorbed doses. Conclusion: Since the acceptable absorbed dose for the complex was observed in the prostate, 188Re-Hynic-Bombesin can be regarded as a new potential agent for prostate cancer therapy.