An Open Label Pharmacokinetic, Safety And Efficacy Study Of Maraviroc In Combination With Background Therapy For The Treatment Of HIV-1 Infected, CCR5 -Tropic Children

The proportion of participants who achieved HIV-1 RNA <400 copies/mL at week 24 or 48 was assessed according to Food and Drug Administration's (FDA's) Missing, Switch, Discontinuation'=Failure (MSDF) Snapshot algorithm. The algorithm uses the plasma HIV-1 RNA in the Week 24 or 48 visit window, follows the "virology-first principle" and considers a participant who has a missing plasma HIV-1 RNA, or switches to prohibited ARV regimen or discontinues from the study or study drug for any reason, or dies, as a failure.

The proportion of participants who achieved HIV-1 RNA <48 copies/mL at week 24 or 48 was assessed according to Food and Drug Administration's (FDA's) Missing, Switch, Discontinuation'=Failure (MSDF) Snapshot algorithm. The algorithm uses the plasma HIV-1 RNA in the Week 24 or 48 visit window, follows the "virology-first principle" and considers a participant who has a missing plasma HIV-1 RNA, or switches to prohibited ARV regimen or discontinues from the study or study drug for any reason, or dies, as a failure.

Participants who have been discontinued from the study, have been lost to follow-up, or have missing HIV-1 RNA data prior to the time point of interest were considered to have HIV-1 RNA levels > lower limit of quantification (LLOQ) . This referred to as [non-completer = failure; NC=F] or [missing, discontinuation = failure; MD=F].

Participants who have been discontinued from the study, have been lost to follow-up, or have missing HIV-1 RNA data prior to the time point of interest were considered to have HIV-1 RNA levels > lower limit of quantification (LLOQ) . This referred as [non-completer = failure; NC=F] or [missing, discontinuation = failure; MD=F].

TLOVR is defined as the time from first dose of study medication (Day 1) until the time of virologic failure using the a TLOVR algorithm.

Percentage of participants with at least a 1.0 log10 reduction in HIV-1 RNA from baseline to Week 24 and Week 48 were tabulated.

Plasma HIV-1 RNA was determined using the Roche COBAS AmpliPrep/COBAS TaqMan HIV-1 Test (lower limit of quantification [LLOQ] <48 copies/mL). Blood samples were taken at the time points indicated in the participant evaluation schedule. Screening HIV-1 RNA >1000 copies/ml was used to determine eligibility for the study.

Plasma HIV-1 RNA was determined using the Roche COBAS AmpliPrep/COBAS TaqMan HIV-1 Test (lower limit of quantification [LLOQ] <48 copies/mL). Blood samples were taken at the time points indicated in the participant evaluation schedule. Screening HIV-1 RNA >1000 copies/ml was used to determine eligibility for the study.

Change from baseline in CD4 cell count to Week 24 and Week 48 were tabulated in aggregated and broken down by age cohort using summary statistics.

Change from baseline in CD4 % to Week 24 and Week 48 were tabulated in aggregated and broken down by age cohort using summary statistics.

The occurrence of any one of the following criteria would constitute Virologic failure: Criteria A=Decrease from Baseline plasma HIV-1 RNA <1 log10 and plasma HIV-1 RNA >400 copies/mL starting at Week 12 and confirmed at consecutive Week 16; Criteria B=Decrease from Baseline plasma HIV-1 RNA <2.0 log10 and plasma HIV-1 RNA >400 copies/mL at Week 24 OR plasma HIV-1 RNA >10,000 copies/mL on and after Week 24, and confirmed within 14 to 21 days; Criteria C=Increase from nadir plasma HIV-1 RNA of >=1 log10 (>=1,000 copies/mL if nadir plasma HIV-1 RNA <48 copies/mL) at any time, and confirmed within 14 to 21 days.

Virus tropism was determined using the Monogram Biosciences Trofile™ viral tropism assay. Change in detected tropism from screening to the time of failure prior to Week 48 was reported. X4=CXCR4 tropic virus; R5=CCR5-tropic virus; X4=CXCR4-tropic virus. Number of participants as per tropism to respective virus has been reported.

Phenotypic and genotypic susceptibility to reverse transcriptase and protease inhibitors was evaluated at screening using the Monogram Biosciences PhenoSense™ GT (PSGT) assay. Samples from a confirmatory PDVF visit or early termination of MVC were planned to be analyzed if the plasma HIV-1 RNA was ≥400 copies/mL. Data for participants with respective gene mutation category has been reported. Participants with more than one mutation are counted more than once.

Data was summarized by the total ARV activity of the background regimen using simple and weighted total optimized background treatment susceptibility scores as well as by screening genotype. Simple total optimized background treatment (OBT) susceptibility scores were categorized as 0, 1, >=2 and weighted total OBT susceptibility scores were categorized as 0 to 0.5, 1 to 1.5 and >=2. However, net susceptibility scores were imputed for simple analysis based on genotype. Susceptibility scores indicate the level resistance to the study medication. Scores ranged from 0 to 1 as 1 = susceptible and potential low-level resistance; 0.5 = low and intermediate-level resistance; 0 = high-level resistance, where higher scores indicated lower resistance.