Role of Structured Treatment Interruption before a 5‐Drug Salvage Antiretroviral Regimen: The Retrogene Study

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Abstract
We evaluated the efficacy of a 5-drug salvage regimen, preceded by a 12-week, structured treatment interruption (STI), in 46 multidrug-treated, human immunodeficiency virus type 1–infected patients with detectable viremia. Patients were randomly assigned to receive a 5-drug salvage regimen immediately (noninterruption [NI] group; n=24 patients) or after 12 weeks of STI (interruption [I] group; n=22 patients). At week 48, 45% of patients in the I group and 46% of patients in the NI group had virus loads <50 HIV-1 RNA copies/mL (P=.619). No differences in CD4 cell counts were seen between groups at week 48 (P=.734). A complete reversion to wild-type genotype was detected in 35% of patients in the I group, but this phenomenon did not affect the virological response. The only overall baseline factor associated with ensuing virus suppression was a lower number of nucleoside reverse-transcriptase inhibitor–resistant mutations (relative risk, 0.66; 95% confidence interval, 0.47–0.93; P=.021). A prior STI seems to confer no additional benefit to subsequent virological or immunological outcomes of a salvage regimen

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