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Rhenium-188 ( 188 Re) is a high energy beta-emitting radioisotope with a short 16.9 h physical half-life, which has been shown to be a very attractive candidate for use in therapeutic nuclear medicine. The high beta emission has an average energy of 784 keV and a maximum energy of 2.12 MeV, sufficient to penetrate and destroy targeted abnormal tissues. In addition, the low-abundant gamma emission of 155 keV (15%) is efficient for imaging and for dosimetric calculations. These key characteristics identify  188 Re as an important therapeutic radioisotope for routine clinical use. Moreover, the highly reproducible on-demand availability of  188 Re from the  188 W/ 188 Re generator system is an important feature and permits installation in hospital-based or central radiopharmacies for cost-effective availability of no-carrier-added (NCA)  188 Re. Rhenium-188 and technetium-99 m exhibit similar chemical properties and represent a “theranostic pair.” Thus, preparation and targeting of  188 Re agents for therapy is similar to imaging agents prepared with  99m Tc, the most commonly used diagnostic radionuclide. Over the last three decades, radiopharmaceuticals based on  188 Re-labeled small molecules, including peptides, antibodies, Lipiodol and particulates have been reported. The successful application of these  188 Re-labeled therapeutic radiopharmaceuticals has been reported in multiple early phase clinical trials for the management of various primary tumors, bone metastasis, rheumatoid arthritis, and endocoronary interventions. This article reviews the use of  188 Re-radiopharmaceuticals which have been investigated in patients for cancer treatment, demonstrating that  188 Re represents a cost effective alternative for routine clinical use in comparison to more expensive and/or less readily available therapeutic radioisotopes.

Rhenium-188 Labeled Radiopharmaceuticals: Current Clinical Applications in Oncology and Promising Perspectives