However, in a 144-week open-label randomised clinical study (GS-01-934) in antiretroviral-naïve patients, where efavirenz, emtricitabine and tenofovir disoproxil fumarate were used as individual formulations (or as efavirenz and the fixed combination of emtricitabine and tenofovir disoproxil fumarate (Truvada) from week 96 to 144), genotyping was performed on plasma HIV-1 isolates from all patients with confirmed HIV RNA > 400 copies/ ml at week 144 or early study drug discontinuation (see section on Clinical experience).