Abstract
Anti-thymocyte globulin (ATG) is an important prophylactic drug against acute graft-versus-host disease (aGVHD) after haploidentical hematopoietic stem cell transplantation (haplo-HSCT). This study analyzed the pharmacokinetics of rabbit ATG 2.5 mg/kg and its effect against aGVHD in 24 patients undergoing unmanipulated haplo-HSCT. All patients had hematological malignancies not in remission. The median absolute lymphocyte count (ALC) before rabbit ATG administration was 9.5/µL (range 0–41/µL). The grade ≥ II aGVHD group had a significantly lower median rabbit ATG concentration on days 0 (C0) and 7 (C7) and areas under the curve on days 0–7 (AUC0–7) and 0–32 (AUC0–32) than the grade 0–I aGVHD group. Among the four parameters, C0 was the most optimal for predicting aGVHD according to the receiver-operating characteristic (ROC) analysis (area under the ROC curve 0.893; 95% confidence interval 0.738–1.000). The high C0 (≥ 27.8 µg/mL) group had significantly lower cumulative incidence of grade ≥ II aGVHD on day 100 than the low C0 (< 27.8 µg/mL) group (13.8% vs. 88.9%, p < 0.001). In haplo-HSCT, the C0 of rabbit ATG is a good predictor of grade ≥ II aGVHD, even though ALC before rabbit ATG administration is not a predictor of aGVHD.
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SY has received honoraria from Sanofi. MT, SM, HT, KK, AM, KF, TI, KY, KI, MO, YO, HO, SH, KM, KM, and TK declare that they have no conflicts of interest.
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Teramoto, M., Maruyama, S., Tamaki, H. et al. Association between the pharmacokinetics of rabbit anti-thymocyte globulin and acute graft-versus-host disease in patients who received haploidentical hematopoietic stem cell transplantation. Int J Hematol 116, 248–257 (2022). https://doi.org/10.1007/s12185-022-03342-8
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DOI: https://doi.org/10.1007/s12185-022-03342-8