Eligible patients had two consecutive plasma HIV-1 RNA assessments of 400 copies
per mL or higher (unless >1000 copies per mL at screening), resistance to two or more classes of antiretroviral drugs,
and had one to two fully active drugs for background therapy. Participants were randomly assigned (1:1) to once-daily
dolutegravir 50 mg or twice-daily raltegravir 400 mg, with investigator-selected background therapy. Matching placebo
was given, and study sites were masked to treatment assignment.