The purpose of this study is to evaluate the efficacy of DTG + 3TC versus DTG + TDF/FTC over 48 weeks in HIV-1 naive patients in a real life setting with no baseline HIV genotypic resistance testing available.

This is a 48-week, Phase IV, randomized, open-label, to assess the non-inferior antiviral activity (VL < 50 c/ml) of 2DR DTG+3TC versus 3DR TDF/FTC + DTG over 48 weeks in HIV1 naïve adult patients without baseline GT available at Day 1 visit. Subjects will be stratified by screening HIV-1 RNA (≤100,000 c/mL or >100,000 c/mL) and Screening CD4+ cell count (≤ or >200 cells/mm3).

The study will comprise:

• a 28-day Screening Phase (which may be extended to 35 days to allow receipt of all Screening assessment results).
• an Open-label Randomized Phase (Day 1 to Week 48).

Approximately 200 HIV-1 naïve adult patients will be randomized 1:1 to receive 2DR DTG+3TC versus 3DR TDF/FTC + DTG for 48 weeks.

Inclusion Criteria:

1. Subject should be antiretroviral naïve (defined as <=10 days of prior therapy with any antiretroviral agent following a diagnosis of HIV 1 infection).
2. Age ≥ 18 years
3. Screening plasma HIV-1 RNA ≥1000 c/mL
4. CD4 cell count nadir: any value
5. Effective contraception for women of childbearing potential.
6. Informed consent form signed by patient and investigator

Exclusion Criteria:

1. History of suicide ideation, intention or action.
2. Evidence of HBV infection based on the results of testing at Screening* for HBV surface antigen (HBsAg), HBV core antibody (anti-HBc), HBV surface antibody (antiHBs or HBsAb), and HBV DNA as follows: Subjects positive for HBsAg are excluded; Subjects negative for anti-HBs and HBsAg but positive for anti-HBc and positive for HBV DNA are excluded.
3. Anticipated need for any HCV therapy during the first 48 weeks of the study.
4. Acute symptomatic HIV Infection.
5. Any active Opportunistic Infection (category C, CDC 2014).
6. Current pregnancy or breastfeeding.
7. No effective contraception for the women of childbearing.
8. Any verified Grade 4 laboratory abnormality. A single repeat test is allowed during the Screening period to verify a result.
9. ALT (Alanine Aminotransferase) ≥ 5 x upper limit of normal value (ULN) or AST (Aspartate Aminotransferase) ≥ 3 x ULN and bilirubinemia ≥ 1.5 x ULN (with 35% direct bilirubinemia).
10. Unstable liver disease (ascitis, encephalopathy, coagulopathy, hypoalbuminemia, oesophageal or gastric varices or persistent jaundice).
11. Creatinine clearance of <50 mL/min/1.73 m2 (Cockroft-Gault method).
12. History or presence of allergy to the trial drugs or their components.
13. Severe hepatic insufficiency (Child Pugh Class C).
14. Any available historical resistance test result.