Safety and Efficacy of Sofosbuvir/Velpatasvir/Voxilaprevir and Sofosbuvir/Velpatasvir in Adults With Chronic HCV Infection Who Have Not Previously Received Treatment With Direct-Acting Antiviral Therapy

Study Overview
=================
Brief Summary
-----------------
The primary objectives of this study are to compare the efficacy, safety, and tolerability of treatment with sofosbuvir/velpatasvir/voxilaprevir (SOF/VEL/VOX) fixed dose combination (FDC) for 8 weeks with that of SOF/VEL FDC for 12 weeks in direct-acting antiviral-naive participants with chronic hepatitis C virus (HCV) infection.

Official Title
-----------------
A Phase 3, Global, Multicenter, Randomized, Open-Label Study to Investigate the Safety and Efficacy of Sofosbuvir/Velpatasvir/GS-9857 Fixed-Dose Combination for 8 Weeks Compared to Sofosbuvir/Velpatasvir for 12 Weeks in Direct-Acting Antiviral-Naïve Subjects With Chronic HCV Infection

Conditions
-----------------
Hepatitis C

Intervention / Treatment
-----------------
* Drug: SOF/VEL/VOX
* Drug: SOF/VEL


Participation Criteria
=================
Eligibility Criteria
-----------------
Key Inclusion Criteria: Willing and able to provide written informed consent HCV RNA ≥ 10^4 IU/mL at screening Chronic HCV infection (≥ 6 months) HCV treatment naive or treatment experienced with an interferon (IFN)-based regimen Use of protocol specified methods of contraception Key Exclusion Criteria: Current or prior history of clinically significant illness that may interfere with participation in the study Screening ECG with clinically significant abnormalities Laboratory parameters outside the acceptable range at screening Pregnant or nursing female Chronic liver disease not caused by HCV Infection with hepatitis B virus (HBV) or human immunodeficiency virus (HIV) Note: Other protocol defined Inclusion/Exclusion criteria may apply.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: SOF/VEL/VOX<br>SOF/VEL/VOX tablet for 8 weeks | Drug: SOF/VEL/VOX<br>* 400/100/100 mg tablet administered orally once daily with food<br>* Other names: Vosevi®;|
| Active Comparator: SOF/VEL 12 weeks<br>SOF/VEL tablet for 12 weeks | Drug: SOF/VEL<br>* 400/100 mg tablet administered orally once daily with or without food<br>* Other names: Epclusa®;|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With Sustained Virologic Response (SVR) 12 Weeks After Discontinuation of Therapy (SVR12) | SVR12 was defined as HCV RNA < the lower limit of quantitation (LLOQ) at 12 weeks after stopping study treatment. | Posttreatment Week 12 | 
| Percentage of Participants Who Permanently Discontinue Study Drug Due to an Adverse Event |  | Up to 12 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With SVR at 4 and 24 Weeks After Discontinuation of Therapy (SVR4 and SVR24) | SVR4 and SVR 24 were defined as HCV RNA < LLOQ at 4 and 24 weeks after stopping study treatment, respectively. | Posttreatment Weeks 4 and 24 | 
| Percentage of Participants With HCV RNA < LLOQ On Treatment |  | Weeks 1, 2, 4, 8, and 12 | 
| Change From Baseline in HCV RNA |  | Baseline; Weeks 1, 2, 4, 8, and 12 | 
| Percentage of Participants With Virologic Failure | Virologic failure was defined as: On-treatment virologic failure: Breakthrough (confirmed HCV RNA ≥ LLOQ after having previously had HCV RNA < LLOQ while on treatment), or Rebound (confirmed > 1 log10 IU/mL increase in HCV RNA from nadir while on treatment), or Non-response (HCV RNA persistently ≥ LLOQ through 8 weeks of treatment) Virologic relapse: Confirmed HCV RNA ≥ LLOQ during the posttreatment period having achieved HCV RNA < LLOQ at last on-treatment visit | Up to Posttreatment Week 24 | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Chronic Hepatitis C Infection