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- W2573039196 abstract "Abstract In this study we tested the efficacy of a test dose of iv busulfan in targeting blood levels of this drug during the conditioning regimen prior to an allogeneic hematopoietic stem cell transplant. We analyzed blood samples of 22 patients undergoing allogeneic hematopoietic stem cell transplantation with a busulfan-based conditioning regimen. Patients received a test dose of busulfan at 0.8 mg/kg as a 60 minute intravenous infusion. Serial blood samples were drawn at eight time points: 15 minutes before dose, at end of infusion, 15 minutes after completion, 30 minutes after completion, 60 minutes after completion, 2 hours after completion, 4 hours after completion, and 6 hours after completion. Pharmacokinetics (PK) studies were then performed at the Seattle Cancer Care pharmacokinetics laboratory. The AUC was determined using WinNonlin Professional software. The conditioning dose of busulfan was calculated by multiplying the test dose in mg/AUC × 4800. After the first dose of busulfan was administered, the same protocol was used to test busulfan PK. If the Busulfan AUC was therapeutic (between 4800 μM*min and 5200 μM*min) then the same dose was continued. If the Busulfan AUC was low or high then the third and fourth doses of busulfan were adjusted. The test dose of 0.8 mg/kg intravenous did not have any hematological side effects. The mean historic dose (solely based on weight) was 3.2 ± 0.1 mg/kg and the mean dose based on the test dose was 3.5 ± 0.5 mg/kg (p=0.02). In 12 patients where we also analyzed PK after the first day of conditioning regimen, AUC values of busulfan obtained during test dose and after day 1 dose were not different (p=0.7). The mean dose of busulfan based on test dose was 3.5 ± 0.6 mg/kg while the final dose based on day 1 busulfan PK was 3.6 ± 0.7 mg/kg (p=0.9). Nevertheless, in 2 CML patients who were on treatment with dasatinib or nilotinib at the time of the test dose, a higher AUC was observed (AUC 6065 and 6200, respectively). A pre-transplant busulfan test dose can be safely performed anytime prior to transplant and allows targeting the dose of busulfan efficiently, thus avoiding the requirement of PK studies during the conditioning regimen." @default.
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- W2573039196 date "2007-11-16" @default.
- W2573039196 modified "2023-09-26" @default.
- W2573039196 title "Pre-Transplant Test Dose vs. PK Studies during Conditioning Regimen To Target iv Busulfan in Allogeneic Hematopoietic Stem Cell Transplantation." @default.
- W2573039196 doi "https://doi.org/10.1182/blood.v110.11.3006.3006" @default.
- W2573039196 hasPublicationYear "2007" @default.
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