Abstract
Background and Objectives
TOL101 is a highly selective murine anti-αβ T cell receptor (TCR) IgM antibody and has recently completed phase II testing in primary renal transplant patients. This study was undertaken to determine the pharmacokinetic, pharmacodynamic, and immunogenic profile of TOL101.
Methods
Nine cohorts of two to six patients received at least five daily doses (of, or combination of, 0.28, 1.4, 7, 14, 28, or 42 mg) of TOL-101 administered at successively higher doses. Semi-logarithmic graphs of serum TOL101 concentration versus time supported the use of a one-compartment intravenous infusion pharmacokinetic model. The model was parameterized in terms of serum clearance (CL) and volume of distribution (V d).
Results
There was a trend toward a decrease in serum CL as the dose increased from 1.4 to 28 mg. However, the mean values for CL and V d were consistent across the cohorts that received 28, 32, and 42 mg. The mean ± standard deviation half-lives for these five cohorts ranged from 15.1 ± 7.35 to 28.6 ± 8.46 h, with an overall mean of 23.8 h, supporting both daily as well as fixed (i.e., not based on weight) dosing. Using CD3+ ≤25 cells/mm3 as the primary pharmacodynamic marker, all non-responders were in the 0.28, 1.4, or 7 mg cohorts, suggesting that starting doses above 14 mg are required. Finally, one patient out of 36 was found to have anti-drug antibody.
Conclusions
Together, the data show that while TOL101 is a highly potent anti-TCR antibody, its pharmacological profile is somewhat versatile, allowing for daily dosing without immunogenicity concerns.
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Acknowledgments
This study was funded, in part, by a Food and Drug Administration Orphan Drug Grant. The authors would like to acknowledge the TOL101 clinical trial team physicians, including Drs Shamkant Mulgoankar, Larry B. Melton, Thomas H. Waid, Ellen C. Cooper, Randall S. Sung, and Fuad Shihab, as well as the following individuals who assisted in study monitoring, and assay and protocol development: Frank Fokta, Ellen Cooper, Amy Morris, Meghann T. Getts, Terra J. Frederick, James J. Herrman, John P. Puisis, and Leslie O’Toole.
The authors have the following conflicts of interest to report. Daniel Getts and Alexander Wiseman received salary support and grant funding from Tolera. William G. Kramer received salary support from Tolera Therapeutics. Stuart Flechner has no conflicts to report in relation to this study.
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Clinicaltrials.gov registration number NCT01154387.
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Getts, D.R., Kramer, W.G., Wiseman, A.C. et al. The Pharmacokinetics and Pharmacodynamics of TOL101, a Murine IgM Anti-Human αβ T Cell Receptor Antibody, in Renal Transplant Patients. Clin Pharmacokinet 53, 649–657 (2014). https://doi.org/10.1007/s40262-014-0138-1
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DOI: https://doi.org/10.1007/s40262-014-0138-1