Add time:08/02/2019         Source:sciencedirect.com

Intralesional therapy has been shown to be an effective treatment for tumors. In this study, the suitability of [188Re]rhenium sulfide suspension for tumor treatment following intra-tumor injection was evaluated. The [188Re]rhenium sulfide suspension was radiolabeled with 188Re with a radiochemical yield of more than 96%. In vitro stability studies revealed that more than 99% of the 188Re remained in sulfide form over a 3-day period. After ultrasonication for 5 or 10 min, the main particle size was 1–5 μm. Two [188Re]rhenium sulfide suspensions ultrasonicated for 5 and 10 min, respectively, were injected into separate group of tumor-bearing mice that were killed after specified times to compare the retention of 188Re in tumors and the leakage to different organs by periods and organs removed to gamma counting. The mean retention percentages of 188Re in tumors injected with suspension ultrasonicated for 5 (or 10) min were as follows: 1 h, 90.5 ± 7.7% (83.1 ± 13.7%); 24 h, 92.2 ± 8.6% (83.9 ± 9.8%); 48 h, 88.3 ± 10.9% (80.2 ± 3.8%); and 72 h, 91.5 ± 7.6% (78.8 ± 3.0%). Tumor-inhibiting ratio was 96.5%. These results demonstrated that [188Re]rhenium sulfide suspension is an effective radiopharmaceutical for tumor treatment by intralesional therapy.

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