A minimal monitoring approach for the treatment of hepatitis C virus infection (ACTG A5360 [MINMON]): a phase 4, open-label, single-arm trial

Abstract

Background: Despite widespread availability of direct-acting antivirals including generic formulations, limited progress has been made in the global adoption of hepatitis C virus (HCV) treatment. Barriers to treatment scale-up include availability and access to diagnostic and monitoring tests, health-care infrastructure, and requirement for frequent visits during treatment.

Methods: ACTG A5360 was a phase 4, open-label, single-arm trial across 38 sites in Brazil, South Africa, Thailand, Uganda, and the USA. Key inclusion criteria were age of 18 years or older, evidence of active HCV infection (HCV RNA >1000 IU/mL) and HCV treatment-naive; patients with compensated cirrhosis and HIV/HCV co-infection were included but their enrolment was capped. All participants received a fixed dose combination of oral sofosbuvir (400 mg) and velpatasvir (100 mg) once daily for 12 weeks. The minimal monitoring (MINMON) approach consisted of four components: (1) there was no pre-treatment genotyping; (2) the entire treatment course (84 tablets) was dispensed at entry; (3) there were no scheduled visits or laboratory monitoring; and (4) there were two points of remote contact, at week 4 for adherence and week 22, to schedule outcome assessment at week 24 (-2 weeks to +4 weeks). Participants who missed the week 24 window could return for a visit to assess treatment response any time before week 72. Unplanned visits for any reason were permissible before the week 24 visit. The primary efficacy outcome was sustained virological response (SVR), defined as HCV RNA less than the lower limit of quantification measured at least 22 weeks post-treatment initiation; the primary safety outcome was serious adverse events. The primary efficacy analysis included all participants who initiated treatment, using a missing=failure approach. The primary safety analysis included all participants who initiated treatment and had at least one post-treatment assessment. This trial is registered at ClinicalTrials.gov, NCT03512210.

Findings: Between Oct 22, 2018, and July 19, 2019, 400 participants were enrolled across all 38 sites; 399 initiated treatment. At the SVR assessment visit, 355 (89%) of 397 participants reported taking 100% of the trial medication during the 12-week treatment period; two patients did not have any follow-up visits after the entry visit and were excluded from the safety analyses. Overall, 379 of the 399 who initiated treatment had an SVR (95·0%, 95% CI 92·4-96·7). 14 (4%) of 397 participants reported serious adverse events between treatment initiation and week 28; none were treatment related or led to treatment discontinuation or death. 15 (4%) of 399 participants had unplanned visits; none were related to treatment.

Interpretation: In this diverse global population of people with HCV, the MINMON approach with sofosbuvir-velpatasvir treatment was safe and achieved SVR comparable to standard monitoring observed in real-world data. Coupled with innovative case finding strategies, this strategy could be crucial to the global HCV elimination agenda.

Funding: US National Institutes of Health and Gilead Sciences.

Conflict of interest statement

Declaration of interests SSS declares grants and study products to the institution from Gilead Sciences related to the submitted work as well as grants and study product to the institution from Gilead Sciences and Abbott Laboratories not related to the submitted work, and honoraria from Gilead Sciences. GKR declares grants to his institution from Gilead Sciences, Citius Pharmaceuticals, Pfizer, Emergent Biosolutions, and Leonard Meron Bioscience, outside of the submitted work, and consulting fees from Teradyne Inc, Massachusetts Executive Office of Energy and Environmental Affairs, and Massachusetts Interscholastic Athletic Association. AS and NC are employees of Gilead Sciences and hold stock in the company. EPN declares honoraria from Gilead and AbbVie. DK declares honoraria and support to attend conferences from Gilead Sciences. JS declares speaker and advisory board honoraria from ViiV, Merck, Gilead, and AbbVie. PT declares consulting fees from ViiV and Merck. CB declares grants from Gilead Sciences paid to her institution, outside of the submitted work, and served as the chair of a data safety and monitoring board (DSMB) for GlaxoSmithKline. SN declares grants from Gilead Sciences and AbbVie to her institution, outside of the submitted work, personal consulting fees from BioMarin and Theratechnologies, support to attend meetings from Gilead Sciences, and has participated on DSMB for Bristol Myers Squibb, FHI 360, and Personal Health Insights Inc, and holds stock options in Vir Bio. DW declares grants to his institution from Gilead Sciences outside of the submitted work and discloses royalties/licenses from UpToDate. MS declares grants to his institution from Gilead Sciences, AbbVie, Janssen, and Assembly Biosciences outside of the submitted work, personal consulting fees from AbbVie, Gilead Sciences, Assembly Biosciences, Arbutus, Virion, Antios, and GlaxoSmithKline, has received honoraria from Practice Point Communication, DKB, and Clinical Care Options, and served on DSMBs and holds stock in Gilead Sciences and AbbVie. All other authors declare no competing interests.

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Figures

Figure 1

Trial profile AE=adverse event. SOF–VEL=sofosbuvir–velpatasvir.

Figure 2

SVR overall and by subgroups defined by various participant baseline characteristics *Other included genotypes 4–7, and three participants with unknown genotype.