Publications

19

Apr, 2010

Discordance between CD4 cell count and CD4 cell percentage: implications for when to start antiretroviral therapy in HIV-1 infected children. concise Communication.

 

Authors: HIV Paediatric Prognostic Markers Collaborative Study

Published in: AIDS 2010, 24, 1213–1217

Read

19

Apr, 2010

Pharmacokinetic study of once-daily versus twice-daily abacavir and lamivudine in HIV type-1-infected children aged 3-<36 months.

 

Authors: Paediatric European Network for Treatment of AIDS (PENTA)

Published in: Antivir Ther. 2010;15(3):297-305.

Background Once-daily dosing of abacavir and lamivudine has been approved for adults, but paediatric data are insufficient. We conducted a pharmacokinetic study of once-daily and twice-daily abacavir and lamivudine in children aged 3-<36 months.

Methods Children with stable HIV type-1 (HIV-1) RNA levels after 12 weeks treatment with twice-daily abacavir (8 mg/kg) with or without lamivudine (4 mg/kg) underwent plasma pharmacokinetic sampling. Children then switched to once-daily abacavir (16 mg/kg) with or without lamivudine (8 mg/kg), and sampling was repeated 4 weeks later. The area under the plasma concentration-time curve over 24 h (AUC(0-24)) and the maximum concentration (C(max)) were compared using geometric mean ratios (GMRs); 90% confidence intervals (CIs) within the range of 0.80-1.25 were considered bioequivalent.

Results A total of 18 children (4, 6 and 8 in the 3-<12, 12-<24 and 24-<36 month age ranges, respectively) provided pharmacokinetic data for abacavir (17 for lamivudine). The GMR of AUC(0-24), once-daily versus twice-daily, was 1.07 (90% CI 0.92-1.23) for abacavir and 0.91 (90% CI 0.79-1.06) for lamivudine. C(max) almost doubled on once-daily versus twice-daily dosing: abacavir and lamivudine GMRs were 2.04 (90% CI 1.73-2.42) and 1.78 (90% CI 1.52-2.09), respectively. At baseline, 12, 24 and 48 weeks, 89%, 94%, 100% and 89% of children had HIV-1 RNA<400 copies/ml, respectively.

Conclusions Bioequivalence was demonstrated on AUC(0-24) between twice-daily and once-daily abacavir; very similar AUC(0-24) values were seen for twice-daily and once-daily lamivudine. Given that viral load suppression rates were maintained, these data suggest that once-daily abacavir and lamivudine might be an option for children aged 3-<36 mont

 

Read

19

Apr, 2010

A Model-based approach to dose selection in early pediatric development

 

Authors: Cella M, Gorter de Vries F, Burger D, Danhof M, Della Pasqua O.

Published in: Clinical Pharmacology and Therapeutics, 2010, 87(3):294-302.

Abstract The establishment of a rationale for determining dosing regimens in pediatric patients remains a challenge in drug development. In this investigation, we explored several methodologies to support bridging studies and evaluated the best descriptor of developmental changes that can be used as a covariate for dose adjustment in children. The proposed approach is illustrated for the antiviral drug abacavir. Using data from six pharmacokinetic studies in adults and one study in children, a model-based analysis was applied in order to characterize differences in parameter distributions and their implications for systemic exposure to abacavir. Simulations were subsequently performed to define the appropriate dosing regimen in children. Although body weight was identified as a covariate for clearance and volume, dosing recommendations calculated on the basis of mg/kg cannot be linearly applied across all weight ranges. Our analysis shows the consequences of empirical dose adjustment and the importance of priors from historical data to support dose selection in children.

18

Apr, 2010

Immunologic and viral dynamics among HIV-infected children after planned treatment interruption: a substudy of the Paediatric European Network for Treatment of AIDS (PENTA) 11 trial.

 

Authors: Sefe D, Klein N, Mosconi I, Ricci E, Castro, H (nee Green), Jacobsen M, Bernardi S, Pillay D, Gibb DM, and De Rossi A, on behalf of the PENTA Steering Committee

Published in: 17th Conference on Retroviruses and Opportunistic Infections, San Francisco, 16-19 February 2010, Poster

Read

18

Apr, 2010

PENTA and IMPAACT: A phase II/III randomised, open-label trial of combination antiretroviral regimens and treatment-switching strategies in HIV-1-infected antiretroviral naïve children

 

PENTA and IMPAACT: A phase II/III randomised, open-label trial of combination antiretroviral regimens and treatment-switching strategies in HIV-1-infected antiretroviral naïve children

Published in: XVIII International AIDS Conference, 22nd July 2010, Vienna Austria.

Read
NEWSLETTER

We would like to update you on our recent activities