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A randomized, controlled study evaluating an induction treatment strategy in which enfuvirtide was added to an oral, highly active antiretroviral therapy regimen in treatment-experienced patients: the INTENSE study.

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Methods: Participants with HIV-1 RNA >/=1000 copies/mL, CD4 count >/=200 cells/mm(3) and genotype sensitivity score >/=2 (excluding enfuvirtide) were randomized 2:1 to enfuvirtide+HAART or HAART alone and assessed every 4 weeks. Participants achieving 50 copies/mL on two consecutive visits by week 24 entered a maintenance phase wherein those receiving enfuvirtide+HAART underwent another randomization 1:1 to maintain enfuvirtide+HAART or discontinue enfuvirtide; those receiving HAART alone continued their regimen. Virological and immunological endpoints were analysed at weeks 24 and 48.

Results: At 24 weeks, 20/31 (65%) participants in the enfuvirtide+HAART arm versus 8/16 (50%) participants in the HAART arm achieved 50 copies/mL. Median time to achieving 50 copies/mL was 57 versus 141 days in the enfuvirtide+HAART and HAART arms (P = 0.048). Withdrawals were similar between groups. In the maintenance phase, at 48 weeks, 14/19 (74%) in the original enfuvirtide+HAART arm (regardless of second randomization) versus 4/8 (50%) in the HAART arm had 50 copies/mL. During maintenance, there were two virological failures in the enfuvirtide+HAART continuation arm, one in the enfuvirtide discontinuation arm and none in the HAART arm.

Conclusion: At 24 weeks, 20/31 (65%) participants in the enfuvirtide+HAART arm versus 8/16 (50%) participants in the HAART arm achieved 50 copies/mL. Median time to achieving 50 copies/mL was 57 versus 141 days in the enfuvirtide+HAART and HAART arms (P = 0.048). Withdrawals were similar between groups. In the maintenance phase, at 48 weeks, 14/19 (74%) in the original enfuvirtide+HAART arm (regardless of second randomization) versus 4/8 (50%) in the HAART arm had 50 copies/mL. During maintenance, there were two virological failures in the enfuvirtide+HAART continuation arm, one in the enfuvirtide discontinuation arm and none in the HAART arm.

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