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Model-based approach for optimization of atazanavir dose recommendations for HIV-infected pediatric patients.

ABSTRACT: Atazanavir (Reyataz; ATV) is a well-tolerated protease inhibitor (PI) that is indicated as a once-daily treatment for HIV infections. These features of ATV, combined with its virologic potency, make it particularly desirable for the treatment of HIV-infected pediatric patients. The objective of this study was to use a model-based approach to recommend body weight-based ATV capsule doses for pediatric patients. ATV concentration-time data from three adult studies and one pediatric study were described by a C(0)-delinked one-compartment model to guard against introducing bias in pharmacokinetic (PK) parameter estimates due to the potential nonadherence in outpatient studies. The apparent clearance (CL/F) and apparent volume of distribution (V/F) were determined to increase with body weight, and CL/F was 40.9% lower in patients receiving ATV comedication with ritonavir (RTV). The relative bioavailability (F(rel)) of ATV was 132% higher with RTV comedication and was 35.5% lower for the ATV powder formulation than the capsule formulation. Model-based simulations were used to recommend weight-based ATV capsule doses of 150 to 300 mg boosted with 100 mg RTV for pediatric patients weighing ≥15 kg, such that the exposures in these patients are similar to those obtained in HIV-infected adults treated with the recommended ATV/RTV dose of 300/100 mg.

SUBMITTER: Hong Y

PROVIDER: S-EPMC3232801 | biostudies-literature | 2011 Dec

REPOSITORIES: biostudies-literature

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Model-based approach for optimization of atazanavir dose recommendations for HIV-infected pediatric patients.

Hong Ying Y Kowalski Kenneth G KG Zhang Jenny J Zhu Li L Horga Mariaarantxa M Bertz Richard R Pfister Marc M Roy Amit A

Antimicrobial agents and chemotherapy 20110919 12

Atazanavir (Reyataz; ATV) is a well-tolerated protease inhibitor (PI) that is indicated as a once-daily treatment for HIV infections. These features of ATV, combined with its virologic potency, make it particularly desirable for the treatment of HIV-infected pediatric patients. The objective of this study was to use a model-based approach to recommend body weight-based ATV capsule doses for pediatric patients. ATV concentration-time data from three adult studies and one pediatric study were desc ...[more]

PMID: 21930880

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Project description:ObjectivePatients with HIV infection have an increased risk of cardiovascular disease compared with uninfected individuals. Antiretroviral therapy with atazanavir (ATV) delays progression of atherosclerosis markers; whether this reduces cardiovascular disease event risk compared with other antiretroviral regimens is currently unknown.DesignPopulation-based, noninterventional, historical cohort study conducted from 1 July 2003 through 31 December 2015.SettingVeterans Health Administration hospitals and clinics throughout the United States.ParticipantsTreatment-naive patients with HIV infection (N = 9500).Antiretroviral exposuresInitiating antiretroviral regimens containing ATV, other protease inhibitors, nonnucleoside reverse transcriptase inhibitors (NNRTIs), or integrase strand transfer inhibitors (INSTIs).Main outcome/effect size measuresIncidence rates of myocardial infarction (MI), stroke, and all-cause mortality within each regimen. ATV versus other protease inhibitor, NNRTI, or INSTI covariate-adjusted hazard ratios by using Cox proportional hazards models and inverse probability of treatment weighting.ResultsIncidence rates for MI, stroke, and all-cause mortality with ATV-containing regimens (5.2, 10.4, and 16.0 per 1000 patient-years, respectively) were lower than with regimens containing other protease inhibitors (10.2, 21.9, and 23.3 per 1000 patient-years), NNRTIs (7.5, 15.9, and 17.5 per 1000 patient-years), or INSTIs (13.0, 33.1, and 21.5 per 1000 patient-years). After inverse probability of treatment weighting, adjusted hazard ratios (95% confidence intervals) for MI, stroke, and all-cause mortality with ATV-containing regimens versus all non-ATV-containing regimens were 0.59 (0.41-0.84), 0.64 (0.50-0.81), and 0.90 (0.73-1.11), respectively.ConclusionAmong treatment-naive HIV-infected patients in the Veterans Health Administration initiating ATV-containing regimens, risk of both MI and stroke were significantly lower than in those initiating regimens containing other protease inhibitors, NNRTIs, or INSTIs.

Project description:BackgroundThe current study was conducted to determine if efavirenz (EFV) or atazanavir/ritonavir (ATV/r)-based combination antiretroviral therapy (cART) impacted steady-state atovaquone plasma concentrations in human immunodeficiency virus (HIV)-infected patients receiving treatment doses of atovaquone.MethodsThirty HIV-infected volunteers were recruited, 10 taking no cART and 10 each taking cART that included EFV or ATV/r. Subjects were randomly assigned to atovaquone 750 mg twice daily (BID) for 14 days followed by atovaquone 1500 mg BID for 14 days, or vice-versa, with a washout period in between. On day 14 of each phase, blood was sampled for pharmacokinetic studies, and the area under the concentration-time curve (AUCτ) and average concentration (C avg) were calculated and compared using an unpaired t test.ResultsTwenty-nine subjects completed both dosing cohorts. Subjects receiving EFV-based cART had 47% and 44% lower atovaquone AUCτ than subjects not receiving cART at atovaquone doses of 750 mg BID and 1500 mg BID, respectively (P≤ .01). Only 5 of 10 subjects receiving EFV-based cART plus atovaquone 750 mg BID had an atovaquone C avg>15 µg/mL, which has previously been associated with successful treatment of Pneumocystis jirovecipneumonia. AUCτ and Cavg did not significantly differ for concurrent ATV/r for 750 mg BID or 1500 mg BID when compared to the group not receiving cART. Nine of 10 subjects not receiving cART, 8 of 10 subjects receiving ATV/r, and 2 of 10 subjects receiving EFV in combination with atovaquone 750 mg BID achieved an atovaquone C avg>18.5 µg/mL, a concentration that has previously been associated with successful treatment of Toxoplasmaencephalitis (TE).ConclusionsThese data suggest that the currently recommended dose of atovaquone 750 mg BID for treatment of mild to moderate PCP may not be adequate in patients receiving concurrent EFV. Furthermore, doses lower than the currently recommended dose of 1500 mg BID may achieve plasma concentrations adequate to treat TE in HIV-infected patients not receiving EFV.Clinical trials registrationNCT01479361.

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Model-based approach for optimization of atazanavir dose recommendations for HIV-infected pediatric patients.

Publications

Model-based approach for optimization of atazanavir dose recommendations for HIV-infected pediatric patients.

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