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Zhang D, Hop CECA, Patilea-Vrana G, Gampa G, Seneviratne HK, Unadkat JD, Kenny JR, Nagapudi K, Di L, Zhou L, Zak M, Wright MR, Bumpus NN, Zang R, Liu X, Lai Y, Khojasteh SC. Drug Concentration Asymmetry in Tissues and Plasma for Small Molecule-Related Therapeutic Modalities. Drug Metab Dispos 2019; 47:1122-1135. [PMID: 31266753 DOI: 10.1124/dmd.119.086744] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 06/10/2019] [Indexed: 02/06/2023] Open
Abstract
The well accepted "free drug hypothesis" for small-molecule drugs assumes that only the free (unbound) drug concentration at the therapeutic target can elicit a pharmacologic effect. Unbound (free) drug concentrations in plasma are readily measurable and are often used as surrogates for the drug concentrations at the site of pharmacologic action in pharmacokinetic-pharmacodynamic analysis and clinical dose projection in drug discovery. Furthermore, for permeable compounds at pharmacokinetic steady state, the free drug concentration in tissue is likely a close approximation of that in plasma; however, several factors can create and maintain disequilibrium between the free drug concentration in plasma and tissue, leading to free drug concentration asymmetry. These factors include drug uptake and extrusion mechanisms involving the uptake and efflux drug transporters, intracellular biotransformation of prodrugs, membrane receptor-mediated uptake of antibody-drug conjugates, pH gradients, unique distribution properties (covalent binders, nanoparticles), and local drug delivery (e.g., inhalation). The impact of these factors on the free drug concentrations in tissues can be represented by K p,uu, the ratio of free drug concentration between tissue and plasma at steady state. This review focuses on situations in which free drug concentrations in tissues may differ from those in plasma (e.g., K p,uu > or <1) and discusses the limitations of the surrogate approach of using plasma-free drug concentration to predict free drug concentrations in tissue. This is an important consideration for novel therapeutic modalities since systemic exposure as a driver of pharmacologic effects may provide limited value in guiding compound optimization, selection, and advancement. Ultimately, a deeper understanding of the relationship between free drug concentrations in plasma and tissues is needed.
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Affiliation(s)
- Donglu Zhang
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Cornelis E C A Hop
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Gabriela Patilea-Vrana
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Gautham Gampa
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Herana Kamal Seneviratne
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Jashvant D Unadkat
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Jane R Kenny
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Karthik Nagapudi
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Li Di
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Lian Zhou
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Mark Zak
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Matthew R Wright
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Namandjé N Bumpus
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Richard Zang
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Xingrong Liu
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - Yurong Lai
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
| | - S Cyrus Khojasteh
- Genentech, South San Francisco, California (D.Z., C.E.C.A.H., J.R.K., K.N., M.Z., M.R.W., R.Z., S.C.K.); Department of Medicine, Division of Clinical Pharmacology, The Johns Hopkins University School of Medicine, Baltimore, Maryland (H.K.S., N.N.B.); Brain Barriers Research Center, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota (G.G.); Department of Pharmaceutics, University of Washington, Seattle, Washington (G.P.-V., J.D.U.); Biogen, Cambridge, Massachusetts (X.L.); Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc., Eastern Point Road, Groton, Connecticut (L.D.); Drug Disposition, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana (L.Z.); and Drug Metabolism, Gilead Sciences, Foster City, California (Y.L.)
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Liu L, Collier AC, Link JM, Domino KB, Mankoff DA, Eary JF, Spiekerman CF, Hsiao P, Deo AK, Unadkat JD. Modulation of P-glycoprotein at the Human Blood-Brain Barrier by Quinidine or Rifampin Treatment: A Positron Emission Tomography Imaging Study. Drug Metab Dispos 2015; 43:1795-804. [PMID: 26354948 DOI: 10.1124/dmd.114.058685] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 09/01/2015] [Indexed: 11/22/2022] Open
Abstract
Permeability-glycoprotein (P-glycoprotein, P-gp), an efflux transporter at the human blood-brain barrier (BBB), is a significant obstacle to central nervous system (CNS) delivery of P-gp substrate drugs. Using positron emission tomography imaging, we investigated P-gp modulation at the human BBB by an approved P-gp inhibitor, quinidine, or the P-gp inducer, rifampin. Cerebral blood flow (CBF) and BBB P-gp activity were respectively measured by administration of (15)O-water followed by (11)C-verapamil. In a crossover design, healthy volunteers received quinidine and 11-29 days of rifampin treatment during different study periods. CBF and P-gp activity was measured in the absence (control; prior to quinidine treatment) and presence of P-gp modulation. At clinically relevant quinidine plasma concentrations, P-gp inhibition resulted in a 60% increase in (11)C-radioactivity distribution across the human BBB as measured by the brain extraction ratio (ER) of (11)C-radioactivity. Furthermore, the magnitude of BBB P-gp inhibition by quinidine was successfully predicted by a combination of in vitro and macaque data, but not by rat data. Although our findings demonstrated that quinidine did not completely inhibit P-gp at the human BBB, it has the potential to produce clinically significant CNS drug interactions with P-gp substrate drugs that exhibit a narrow therapeutic window and are significantly excluded from the brain by P-gp. Rifampin treatment induced systemic CYP3A metabolism of (11)C-verapamil; however, it reduced the ER by 6%. Therefore, we conclude that rifampin, at its usual clinical dose, cannot be used to induce P-gp at the human BBB to a clinically meaningful extent and is unlikely to cause inadvertent BBB-inductive drug interactions.
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Affiliation(s)
- Li Liu
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Ann C Collier
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Jeanne M Link
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Karen B Domino
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - David A Mankoff
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Janet F Eary
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Charles F Spiekerman
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Peng Hsiao
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Anand K Deo
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
| | - Jashvant D Unadkat
- Department of Pharmaceutics (L.L., P.H., A.K.D., J.D.U.), Department of Medicine (A.C.C.), Division of Nuclear Medicine (J.M.L., D.A.M., J.F.E.), Department of Anesthesiology and Pain Medicine (K.B.D.), and Department of Oral Health Sciences (C.F.S.), University of Washington, Seattle, Washington
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