Open-label Safety Study of E/C/F/TAF (Genvoya®) in HIV-1 Positive Patients With Mild to Moderate Renal Impairment

Key Inclusion Criteria: Cohort 1 (treatment-experienced switch)

• Must not have a history of known resistance to elvitegravir (EVG), tenofovirdisoproxil fumarate (TDF), or emtricitabine (FTC)

• Plasma HIV-1 RNA concentrations (at least two measurements) at undetectable levels (according to the local assay being used) in the 6 months preceding the screeningvisit and have HIV-1 RNA < 50 copies/mL at screening

• Estimated glomerular filtration rate (GFR) 30-69 mL/min according to theCockcroft-Gault formula for creatinine clearance, using actual weight

• May be currently enrolled in Gilead studies GS-US-236-0102, GS-US-236-0103, andGS-US-216-0114, but will be eligible to enroll only after the Week 144 visit for thatstudy is complete; or currently receiving Stribild® (STB) or atazanavir (ATV)/cobicistat (COBI) + Truvada (TVD) in Gilead studies GS-US-236-0104 orGS-US-216-0105, but will be eligible to enroll only after the Week 48 visit for thatstudy is complete. Cohort 2 (treatment-naive)

• Plasma HIV-1 RNA levels ≥ 1,000 copies/mL at screening

• Screening genotype report provided by Gilead Sciences must show sensitivity to EVG,FTC, and TDF

• No prior use of any approved or investigational antiretroviral drug for any length oftime, except the use for pre-exposure prophylaxis (PrEP), or post-exposure prophylaxis (PEP), up to 6 months prior to screening

• Estimated GFR 30-69 mL/min according to the Cockcroft Gault formula for creatinineclearance, using actual weight All Cohorts: All individuals must meet all of the following inclusion criteria to be eligible forparticipation in this study:

• The ability to understand and sign a written informed consent form, which must beobtained prior to initiation of study procedures

• CD4+ count of ≥ 50 cells/μL

• Stable renal function: serum creatinine measurements to be taken at least once (withinthree months of screening)

• Cause of underlying chronic kidney disease (eg hypertension, diabetes) stable, withoutchange in medical management, for 3 months prior to baseline

• Normal electrocardiogram (ECG)

• Hepatic transaminases (AST and ALT) ≤ 5 x upper limit of normal (ULN)

• Total bilirubin ≤ 1.5 mg/dL, or normal direct bilirubin

• Adequate hematologic function

• Serum amylase ≤ 5 x ULN

• Females of childbearing potential must agree to utilize highly effective contraceptionmethods (two separate forms of contraception, one of which must be an effectivebarrier method, or be non-heterosexually active, practice sexual abstinence) fromscreening throughout the duration of study treatment and for 30 days following thelast dose of study drug

• Females who utilize hormonal contraceptive as one of their birth control methods musthave used the same method for at least three months prior to study dosing

• Males must agree to utilize a highly effective method of contraception duringheterosexual intercourse throughout the study period and for 30 days followingdiscontinuation of investigational medicinal product. A highly effective method ofcontraception is defined as two separate forms of contraception, one of which must bean effective barrier method, or males must be non-heterosexually active, or practicesexual abstinence

Key Exclusion Criteria:

• A new AIDS-defining condition (excluding CD4 cell count and percentage criteria)diagnosed within the 30 days prior to screening,with the exception of the first twobullet points

• Hepatitis C virus (HCV) antibody positive. Individuals who are HCV positive, but havea documented negative HCV RNA, are eligible

• Hepatitis B surface antigen (HBVsAg) positive

• Individuals receiving drug treatment for Hepatitis C, or individuals who areanticipated to receive treatment for Hepatitis C during the course of the study

• Individuals experiencing decompensated cirrhosis (eg, ascites, encephalopathy, etc.)

• 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 interferewith study compliance

• A history of malignancy within the past 5 years or ongoing malignancy other thancutaneous Kaposi's sarcoma, basal cell carcinoma, or resected, non-invasive cutaneoussquamous carcinoma

• Active, serious infections (other than HIV-1 infection) requiring parenteralantibiotic or antifungal therapy within 30 days prior to baseline

• Individuals on hemodialysis, other forms of renal replacement therapy, or on treatmentfor underlying kidney diseases (including prednisolone and dexamethasone)

• Individuals receiving ongoing therapy with any medications not to be used with EVG,COBI, FTC, or TAF or individuals with any known allergies to the excipients ofE/C/F/TAF Note: Other protocol defined Inclusion/Exclusion criteria may apply.