Does Pharmacology Support On Demand PrEP?
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1 Does Pharmacology Support On Demand PrEP? Angela DM Kashuba UNC Eshelman School of Pharmacy UNC Chapel Hill
2 Conflict of Interest UNC has received research funding from: Gilead Sciences Inc Merck Research Laboratories GlaxoSmithKline Consultant Merck Research Laboratories Viiv Healthcare
3 Pharmacology Goals for Event Driven Dosing Prevent HIV infection by delivering.. 1. the right drug(s) 2. to the right biological site(s) 3. at the right concentration(s) 4. for the right length of time
4 The Right Site Mucosal Tissues Colorectal tissue Female Genital Tract Tissue McGowan 2006
5 The Right Site Early Events in HIV Infection Stroma Where should infection be aborted? What is the ARV target conc n needed to abort HIV infection? Fauci A. WAC 2010
6 The Right Site Oral ARV Dosing: FTG and Colorectal Concentration Relative to Blood Thompson et al. J Acquir Immune Defic Syndr Jul; 63(02): S240
7 The Right Concentration: TFVdp and FTCtp In Mucosal Tissues TFV TFVmp TFVdp FTC FTCmp FTCdp FTCtp FTCtp (fmol/g) Female Genital Tract AUC0-14d (fmol*d*g -1 ) >50-fold lower 10 3 Rectal Time (hr) Sci Transl Med Dec 7;3(112):112re4.
8 The Right Concentration How Many Doses to Get to Steady-State Conditions? Lower FGT Tissue Rectal Tissue FTCtp 1000 TFVdp 9 Ctrough (nmolar) TFVdp Ctrough (nmolar) FTCtp First 10 Daily Doses First 10 Daily Doses Cottrell et al J Infect Dis Jul 1;214(1):55 Yang K. American Conference on Pharmacometrics 5, Abstract. Las Vegas NV October 12-15, 2014.
9 The Right Concentration: More Than Just TFVdp and FTCtp For Efficacy In Mucosal Tissues FTCtp dctp TFVdp datp TFV Activity datp De Clerq Nature Reviews 2005
10 The Right Concentration Rectal Tissue datp and dctp <<< Vaginal/Cervical Tissue Cottrell et al J Infect Dis Jul 1;214(1):55
11 The Right Concentration How Different are These Ratios in Mucosal Tissues? Molar TFVdp:dATP Ratio Colorectal Female GT TFVdp:dATP FGT Tissue Rectal Tissue Trough SS Ratio FGT = Rectal = 17 Molar FTCtp:dCTP Ratio FTCtp:dCTP Female GT Colorectal Trough SS Ratio FGT = 1.8 Rectal = 1.8 FGT Tissue Rectal Tissue First 10 Daily Doses First 10 Daily Doses Cottrell et al J Infect Dis Jul 1;214(1):55 Yang K. American Conference on Pharmacometrics 5, Abstract. Las Vegas NV October 12-15, 2014.
12 The Right Concentration Choosing Pharmacologic Targets Cottrell et al J Infect Dis Jul 1;214(1):55 Target Ratios for Cellular Protection
13 % Achieving EC95 Target Ratio % Achieving EC95 Target Ratio The Right Concentration Estimating Efficacy With Various Doses/Week How many achieve effective (steady-state) concentrations at the end of dosing interval? Cottrell et al J Infect Dis Jul 1;214(1):55 Cottrell et al R4P 2014 Colorectal Tissue Female Genital Tract 100 Emtricitabine Tenofovir-DF Truvada 100 Emtricitabine Tenofovir-DF Truvada % Achieving TZMbl EC95 Target Ratio % Achieving TZMbl EC95 Target Ratio Doses/Week Doses/Week iprex OLE= HIV incidence by 90% with 2 Truvada doses per week Partners PrEP= HIV incidence by 90% with 7 Truvada doses per week
14 The Right Time On Demand PrEP Stroma 24-36h replication-competent HIV may reside in cervical tissue cx up to 8d (Collins 2000)
15 % Achieving EC95 Target Ratio The Right Concentration Time To Maximal Protection; Daily Dosing with Truvada Maximal Protection by dose 2 in RT 100 Maximal Protection by dose 3 in FGT % Achieving TZMbl EC95 Target Ratio Female Genital Tissue (FGT) Rectal Tissue (RT) SS % Achieving Target in FGT SS % Achieving Target RT Dose
16 % Achieving Target Exposure % Achieving Target Exposure The Right Time Estimating Truvada Efficacy With Ipergay Dosing Strategy Colorectal tissue Female Genital Tract Tissue 3d 5d 7d 3d 5d 7d
17 Does Pharmacology Support On Demand PrEP? Yes if.. Drug/metabolite can quickly reach sites of infection mucosal tissues/regional lymph nodes Drug/metabolite achieves potent concentrations above IC50, IC95? Drug/metabolite has long residence time to cover residual virus Otherwise may need to continue dosing Right site Right conc Right time Caveats Can virus be trafficked to sites of low drug concentrations? Do inflammatory processes overwhelm the activity of standard doses/dose frequencies? Might other sources of pharmacologic variability exist (eg microbiome)?
18 Acknowledgements UNC CPAC Laboratory Members Mackenzie Cottrell, MS, PharmD Heather Prince, PA-C Katy Garrett, PharmD Craig Sykes, MS Nicole White, BS Stephanie Malone, MA Amanda Schauer, BS Kimberly Handy, MPH Kuo Yang, PharmD, MS John Dohnal, MBA Julie Dumond, PharmD UNC School of Medicine Collaborators Myron Cohen, MD Elizabeth Geller, MD Nicholas Shaheen, MD Gretchen Stuart, MD Yuri Fedoriw, MD Cindy Gay, MD U01 AI P30 AI U19 AI S10 RR P01 MH R01 AI K23 AI T32 GM K23 HD R37 DK R56 AI K23 AI GSK/Viiv Gilead Tibotec Merck
ADM Kashuba, PharmD, Eshelman School of Pharmacy, UNC Chapel Hill
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