Study to Evaluate the Safety and Efficacy of Elvitegravir/Cobicistat/Emtricitabine/Tenofovir Alafenamide Versus Elvitegravir/Cobicistat/Emtricitabine/ Tenofovir Disoproxil Fumarate in HIV-1 Positive, Antiretroviral Treatment-Naïve Adults

Inclusion Criteria:

• Ability to understand and sign a written informed consent form, which must be obtained prior to initiation of study procedures
• Plasma HIV-1 RNA levels ≥ 1,000 copies/mL at screening
• No prior use of any approved or investigational antiretroviral drug for any length of time, except the use for pre-exposure prophylaxis (PREP), post-exposure prophylaxis (PEP), or treatment during pregnancy, up to 6 months prior to screening
• Screening genotype report must show sensitivity to EVG, FTC, TDF
• Normal electrocardiogram (ECG)
• Estimated GFR ≥ 50 mL/min according to the Cockcroft-Gault formula for creatinine clearance
• Hepatic transaminases (AST and ALT) ≤ 5 × upper limit of normal (ULN)
• Total bilirubin ≤ 1.5 mg/dL, or normal direct bilirubin
• Adequate hematologic function
• Serum amylase ≤ 5 × ULN
• Male subjects and females of childbearing potential must agree to utilize highly effective contraception methods or be non-heterosexually active or practice sexual abstinence from screening throughout the duration of study treatment and for 30 days following the last dose of study drug
• Female subjects who utilize hormonal contraceptive as one of their birth control methods must have used the same method for at least three months prior to study dosing
• Female subjects who have stopped menstruating for ≥ 12 months but do not have documentation of ovarian hormonal failure must have a serum follicle stimulating hormone (FSH) level at screening within the post-menopausal range based on the Central Laboratory reference range
• Age ≥ 18 years

Exclusion Criteria:

• A new acquired immunodeficiency syndrome (AIDS) defining condition diagnosed within the 30 days prior to screening
• Hepatitis B surface antigen (HBsAg) positive
• Hepatitis C antibody positive
• Subjects experiencing decompensated cirrhosis
• Females who are breastfeeding
• Positive serum pregnancy test
• Have an implanted defibrillator or pacemaker
• Current alcohol or substance use judged by the Investigator to potentially interfere with subject study compliance
• History of malignancy within the past 5 years or ongoing malignancy other than cutaneous Kaposi's sarcoma, basal cell carcinoma, or resected, noninvasive cutaneous squamous carcinoma
• Active, serious infections (other than HIV-1 infection) requiring parenteral antibiotic or antifungal therapy within 30 days prior to baseline
• Any other clinical condition or prior therapy that, in the opinion of the Investigator, would make the subject unsuitable for the study or unable to comply with dosing requirements
• Participation in any other clinical trial (including observational trials) without prior approval
• Subjects receiving ongoing therapy with drugs not to be used with EVG, COBI, FTC, TDF, and TAF or subjects with any known allergies to the excipients of E/C/F/TDF or E/C/F/TAF single-tablet regimen tablets