Study to Evaluate Efficacy and Safety of Darunavir/Cobicistat/Emtricitabine/Tenofovir Alafenamide (D/C/F/TAF) Regimen Versus Boosted Protease Inhibitor (bPI) Along With Emtricitabine/Tenofovir Disoproxil Fumarate (FTC/TDF) Regimen in Virologically-Suppressed, HIV-1 Infected Participants

This is a randomized (study medication assigned to participants by chance), active-controlled
(study in which the experimental treatment or procedure is compared to a standard treatment
or procedure), open-label (participants and researchers are aware about the treatment,
participants are receiving), multicenter (when more than 1 hospital or medical school team
work on a medical research study), study in virologically-suppressed, HIV-1 infected adult
participants. The study will include a Screening Period of approximately 30 days (up to
maximum 6 weeks), a controlled Treatment Period of 48 weeks, an Extension Phase of 48 weeks.
All eligible participants will be randomly assigned to receive either current treatment
regimen - a bPI (limited to DRV with low-dose ritonavir [rtv] or COBI, atazanavir [ATV] with
rtv or COBI, or lopinavir [LPV] with rtv) combined with FTC/TDF, or experimental treatment
regimen - D/C/F/TAF once-daily single-tablet for 48 weeks. After completion of week 48,
participants assigned to the experimental treatment will continue with D/C/F/TAF in the
extension phase up to week 96 . Participants who continued their current regimen will receive
the experimental treatment (if all criteria are fulfilled) at week 52 up to week 96. As from
Week 96, all participants will be given the option to continue D/C/F/TAF treatment, if they
wish and if they continue to benefit from it until D/C/F/TAF becomes commercially available
and is reimbursed, or can be accessed through another source in the country where he/she is
living,or until the sponsor terminates clinical development. A bone investigation substudy
will be performed at selected study sites, to assess bone biomarkers and energy x-ray
absorptiometry (DXA) scans, in approximately 300 participants (200 in the D/C/F/TAF treatment
arm versus 100 in the control arm) who provide informed consent for the substudy.

Inclusion Criteria:

- Currently being treated with a stable antiretroviral (ARV) regimen consisting of a
boosted protease inhibitor (limited to darunavir [DRV] or atazanavir with low-dose
ritonavir [rtv] or cobicistat [COBI], or lopinavir with rtv) combined with
emtricitabine/tenofovir disoproxil fumarate (FTC/TDF) only, for at least 6 consecutive
months preceding the Screening visit

- On-treatment plasma human immunodeficiency virus type 1 ribonucleic acid (HIV-1 RNA)
concentrations less than (<) 50 copies per milliliter (copies/mL) or HIV-1 RNA
undetectable by a local HIV-1 RNA test between 12 and 2 months prior to the Screening
visit and have HIV-1 RNA <50 copies/mL at the Screening visit

- A single virologic elevation of greater than or equal to (>=) 50 copies/mL after
previously reaching viral suppression between 12 and 2 months prior to Screening is
acceptable, provided a subsequent test prior to Screening was <50 copies/mL

- Absence of history of failure on DRV treatment and absence of DRV
resistance-associated mutations (RAMs), if documented historical genotypes are
available

- Normal electrocardiogram (ECG) at Screening (or if abnormal, determined by the
Investigator to be not clinically significant)

Exclusion Criteria:

- A new acquired immunodeficiency syndrome (AIDS) - defining condition diagnosed within
the 30 days prior to Screening

- Proven or suspected acute hepatitis within 30 days prior to study entry

- Hepatitis C antibody positive; however, participants previously cured of hepatitis C
virus (HCV) infection, with documented sustained virologic response, that is,
undetectable HCV RNA 24 weeks after the last dose of HCV treatment, are allowed to
participate

- Hepatitis B surface antigen (HBsAg) positive

- Participants with cirrhosis as diagnosed based on local practices