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J Int AIDS Soc. 2014 Nov 2;17(4 Suppl 3):19490. doi: 10.7448/IAS.17.4.19490. eCollection 2014.

Once-daily dolutegravir is superior to once-daily darunavir/ritonavir in treatment-naïve HIV-1-positive individuals: 96 week results from FLAMINGO.

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Service des Maladies, Infectieuses et Tropicales, Hôpital Saint Louis, Paris, France.
HIV Unit, Hospital Universitari Germans Trias i Pujol, Irsicaixa Foundation, UAB, UVIC-UCC, Badalona, Catalonia, Spain.
Infectious Diseases Unit, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Department of Infectious Diseases, IRCCS San Raffaele Via Stamira d'Ancona, Milan, Italy.
Infectious Disease Service, Lausanne University Hospital, Lausanne, Switzerland.
Department of Medicine, Hennepin County Medical Center, Minneapolis, MN, USA.
Clinical Center for Prevention and Control of AIDS, Krasnodar, Russian Federation.
Clinical Statistics, GlaxoSmithKline, Stockley Park, UK.
Infectious Diseases, GlaxoSmithKline, Clinical Development, Research Triangle Park, NC, USA.
PPD, Pharmacovigilance, Morrisville, NC, USA.



Dolutegravir (DTG) 50 mg once daily was superior to darunavir/ritonavir (DRV/r) 800 mg/100 mg once daily through Week 48, with 90% vs. 83% of participants achieving HIV RNA 50 c/mL (p=0.025) [1]. We present data through Week 96.


FLAMINGO is a multicentre, randomized, open-label, Phase IIIb non-inferiority study, in which HIV-1-positive ART-naïve adults with HIV-1 RNA≥1000 c/mL and no evidence of viral resistance were randomized 1:1 to receive DTG or DRV/r, with investigator-selected backbone NRTIs (TDF/FTC or ABC/3TC). Participants were stratified by screening HIV-1 RNA (≤100K c/mL) and NRTI backbone.


A total of 484 adults were randomized and treated; 25% had baseline HIV RNA 100K c/mL. At Week 96, the proportion of participants with HIV RNA 50 c/mL was 80% in the DTG arm vs. 68% in the DRV/r arm (adjusted difference 12.4%; 95% CI 4.7, 20.2%; p=0.002). Secondary analyses supported primary results: per-protocol [(DTG 83% vs. DRV/r 70%), 95% CI 12.9 (5.3, 20.6)] and treatment-related discontinuation = failure [(98% vs. 95%), 95% CI 3.2 (-0.3, 6.7)]. Overall virologic non-response (DTG 8%; DRV/r 12%) and non-response due to other reasons (DTG 12%; DRV/r 21%) occurred less frequently on DTG. As at Week 48, the difference between arms was most pronounced in participants with high baseline viral load (82% vs. 52% response through Week 96) and in the TDF/FTC stratum (79% vs. 64%); consistent responses were seen in the ABC/3TC stratum (82% vs. 75%). Six participants (DTG 2, none post-Week 48; DRV/r 4, two post-Week 48) experienced protocol-defined virologic failure (PDVF; confirmed viral load 200 c/mL on or after Week 24); none had treatment-emergent resistance to study drugs. Most frequent drug-related adverse events (AEs) were diarrhoea, nausea and headache, with diarrhoea significantly more common on DRV/r (24%) than DTG (10%). Significantly more participants had Grade 2 fasting LDL toxicities on DRV/r (22%) vs. DTG (7%), p<0.001; mean changes in creatinine for DTG (~0.18 mg/dL) observed at Week 2 were stable through Week 96.


Once-daily DTG was superior to once-daily DRV/r in treatment-naïve HIV-1-positive individuals, with no evidence of emergent resistance to DTG in virologic failure and relatively similar safety profiles for DTG and DRV/r through 96 Weeks.


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