Myeloprotective Effects of Different Amifostine Regimens in Rabbits Undergoing High-Dose Treatment with 186 Rhenium-(tin)1,1- Hydroxyethylidene Diphosphonate ( 186 Re-HEDP)

Abstract

The aim of this study is to investigate the myeloprotective effects of different amifostine regimens in rabbits undergoing high-dose treatment with ¹⁸⁶Rhenium-(tin)1,1-hydroxyethylidene diphosphonate(¹⁸⁶Re-HEDP) and to analyze the impact of amifostine on the bone uptake of the radiopharmaceutical. All animals were treated with 1000 MBq ¹⁸⁶Re-HEDP. Group ReA received 500 mg amifostine prior to radionuclide therapy, group ReA3 received 3 × 200 mg amifostine 24 hours and 30 minutes prior to and 24 hours after radionuclide therapy. Group ReC served as control receiving no amifostine. Scintigrams were acquired to quantify the skeletal uptake of ¹⁸⁶Re-HEDP, and platelet and leucocyte counts were measured. The mean decrease in platelets was 36% ± 2%, 37% ± 3%, and 61% ± 5% for ReA, ReA3, and ReC, respectively. The decrease in ReC was significantly higher than in amifostine-treated animals with no difference between ReA and ReA3. For the leucocytes the mean decrease was 75% ± 12%, 82% ± 5%, and 73% ± 4%, with no significant differences between the respective groups. Bone uptake of ¹⁸⁶Re-HEDP was significantly reduced by 50% in ReA and ReA3 compared to ReC. Thus, the 3-day amifostine regimen had no advantage over the single dose regimen, with both regimens reducing bone uptake and yielding a platelet-protective but no leucoprotective effect.