Hepatitis C is a blood borne virus that can seriously damage the liver. An estimated 50,000 Scots have been infected with Hepatitis C virus (HCV). The main driver for spread of HCV infection is intravenous drug use. As HCV is highly infectious by the blood borne route through needle sharing, it can infect the person who injects drugs (PWID) early in their habit.

Around two thirds of people who are infected are unaware of it, and often show no symptoms over a long period of time. While there is presently no vaccination for Hepatitis C, improved treatments with shorter duration are now available. This raises the possibility of using therapy as prevention, turning the epidemic off at source, by targeting active PWID who are the main source of new infections. Modelling work illustrates the startling possibility and impact of treating drug users to reduce the prevalence of HCV.

The focus of this trial will be to ascertain whether oral treatment regimens are effective in the treatment as prevention scenario in an active PWID population where illicit drug taking and poor adherence may reduce treatment efficacy. The investigators will trial 3 different methods of delivering treatment and will trial an unlicensed combined treatment against HCV genotype 3 infection of shortened duration since current regimens for this genotype are limited.

The investigators will recruit 135 participants and randomise them to one of three arms: daily, directly observed therapy; fortnightly dispensing of drugs; fortnightly dispensing of drugs with a psychological adherence intervention. Randomisation will be stratified according to HCV genotype. Participants will be treated for 12 or 8 weeks depending on genotype and followed up 12 weeks post treatment for the measurement of sustained viral response (SVR). The primary outcome measure will be SVR at 12 weeks post treatment (SVR12), as this measure of cure is the determinant of sufficient compliance and efficacy within the 3 treatment arms. Analysis will be by modified intention to treat of all participants who receive one dose of therapy, to show non-inferiority fortnightly dispensing is easier to deliver than daily dispensing.

Hepatitis C is a blood borne virus that can seriously damage the liver. An estimated 50,000 Scots have been infected with Hepatitis C virus (HCV). The main driver for spread of HCV infection is intravenous drug use. As HCV is highly infectious by the blood borne route through needle sharing, it can infect the PWID early in their habit. With the advent of more effective therapies of shortening duration, it raises the possibility of using therapy as prevention, turning the epidemic off at source, by targeting active infected drug users who are the main source of new infections.

The modelling work of Martin et al, raises the startling possibility of the profound impact of treating small numbers of drug users on the prevalence of HCV, the work shows that treating as few as 10-20 per 1000 drug users per year can reduce HCV prevalence by 50-90% over 10 years. This has generated in the HCV field, the concept of treatment as prevention. The scale of the benefit is exponentially related to prevalence of HCV in the population, the lower the prevalence the bigger the impact. The model has some limitations, it groups all drug users together and assumes a similar risk of infection for those on methadone and those actively injecting and assumes a high rate of turn over from methadone back to active injecting and further assumes treatment is only possible during the opiate substitution phase.

Oral anti-HCV regimens that are interferon free and have virtually no side-effects are now the standard of care in conventional treatment populations. The medication should be taken daily to optimise therapeutic success, and if adherence is poor in the actively injecting population it is possible that the effectiveness of the new oral drugs will be reduced. It is key to know if all oral directly acting antivirals (DAA) regimens are robust and maintain SVR rates in this population. The real world SVR rate combined with drug cost, re-infection rate and emergence of viral resistance will determine if this treatment as prevention model is cost-effective with DAAs. Directly observed therapy (DOT) is the ultimate adherence aid, but it is more costly and draconian so that it may discourage participants, especially this group, from taking up therapy. Therefore the investigators need to demonstrate that treatment uptake and adherence is sufficient to maintain the SVR rate at a level which makes treatment as prevention cost effective. Three means of delivery will be compared: daily DOT vs fortnightly pick up of therapy vs. fortnightly pick-up of therapy with a psychological intervention for adherence. The DOT method of treatment has not been explored in this difficult to find and engage population previously. Contingency management in the form of protein drinks for successful completion of each fortnight of treatment will be provided in all three arms of the trial. A comparison of the three pathways mentioned above will show which pathway shows best acceptability to participants and greatest compliance

The advent of DAAs with their reduced side effect profiles, shorter treatment duration and high SVR rates have the potential to reduce the burden of treatment providing high levels of adherence can be maintained. However, the use of DAAs alone are unlikely to be sufficient to achieve the required levels of adherence. In addition, the use of DAAs will not address the psychosocial factors known to influence adherence. This trial will therefore investigate the effectiveness of a nurse-led educational intervention for adherence to DAAs in a PWID population.

Whilst the combination of Grazoprevir and Elbasvir is licensed for treatment of HCV genotype 1, treatment of HCV genotype 3 is more problematic. The C-SWIFT trial has recently shown that the combination of Grazoprevir, Elbasvir and Sofosbuvir is an effective and safe 8 week treatment for HCV genotype 3, resulting in high SVR rates. Whilst all 3 drugs are licensed for treatment of HCV, the combination is not yet licensed. This combination will be used to treat HCV genotype 3 infections in this trial.

Hepatitis C virus is prone to develop resistance to DAAs since it has a high replication rate and therefore forms large numbers of genetically-distinct viral variants. The investigators will investigate whether participants who do not achieve SVR are infected with a drug resistant strain of HCV by sequencing the NS3 and NS5A regions of viral nonstructural (NS) protein present within their blood. The proteins of these genes are targeted by the DAA medications and if their structure is altered the DAA may no longer be effective.

The trial will also explore whether the taking of illicit drugs affects the efficacy of treatment. While the main effect is likely to be via adherence, it is also possible that some of the illicit drugs may interact with the DAAs. A log of illicit drugs used by the participants will be kept and used to identify any candidate interactions for further investigation.

This is a randomised, un-blinded trial which will be conducted in the needle exchange services and pharmacies across Tayside, designed to evaluate the efficacy and feasibility of DAA therapy, in HCV positive, genotype 1 and 3, active PWIDs, administered via three different routes:

1. DOT,
2. Fortnightly pick-up
3. Fortnightly pick-up with psychological intervention.

Participants included in the trial will have a reactive Dry Blood Spot (DBS) test to confirm HCV infection, polymerase chain reaction (PCR) test to confirm active infection and will currently be using illicit drugs, as confirmed by the participant. Drug screening (by urine sample) will not be tested at that time.

Participants will be stratified by the genotype of their HCV infection; genotype 1 vs genotype 3 and randomised to one of three groups; DOT, fortnightly pick-up, or fortnightly pick-up with psychological adherence intervention.

All PWID are encouraged to have a DBS test annually as part of clinical practice in Tayside. Upon receipt of a reactive DBS test, potential participants will be briefed about the trial by the specialist nurse or other trained member of staff and given a participant information sheet (PIS) informing them of what is involved. Willing individuals will provide written informed consent and will then have safety bloods drawn to determine eligibility to proceed.

Participants in all three arms of the trial will attend a baseline visit, a randomisation visit either one (genotype 3) or two (genotype 1) visits during treatment, an end of treatment visit and an SVR visit.

All participants will be given incentives to continue with their treatment in the trial. These will consist of protein drinks and will be given at each study visit.

Psychological intervention Participants randomised to fortnightly pick-up with psychological intervention will have an interview with the study nurse, prior to beginning their treatment, which will cover the educational intervention designed to aid their compliance with the drug regimen. The intervention will be based on the Information-Motivation-Behavioural (IMB) Skills Model of Adherence12 which was originally developed to explain adherence behaviour in HIV. Recent research suggests this model may have applicability in understanding the facilitator and barriers to adherence in HCV patients. The model suggests that provision of medication information, enhancing personal and social motivation and developing behavioural skills that are key determinants of adherence and may improve adherence in this group. The intervention will involve a structured interview in which the trial nurse and participant will develop an action plan that includes personalised information, sources of motivation for adherence and a treatment routine configured to be compatible with the participant's lifestyle. Anticipating barriers to adherence and problem-solving will be included in the treatment routine. The intervention will take place at the randomisation visit and last approximately one hour. During the intervention, participants will be guided by their trial nurse in the completion of a personalised booklet, "Hepatitis C and Me". The booklet contains general and personalised information on Hepatitis C, exercises designed to explore and enhance personal and social motivation for treatment adherence and a behavioural action plan (the skills element of the IMB model). The booklet uses the principles of node-link mapping to structure the intervention. Node link mapping use a set of visual tools to structure and guide therapeutic conversation and has been shown to enhance memory and compliance with treatment in substance misusers. Participants in the other two arms of the trial, who are not receiving the psychological intervention, will be given the current National Health Service (NHS) Tayside hepatitis information booklet ("Living with Hepatitis C") which provides generalised information about HCV without personalised information or specific strategies to enhance motivation and behavioural skills.

Reinfection follow up. Trial participants will be invited to also consent for access to information from their annual clinic visits and HCV testing at any other contact with clinical services for up to 5 years, to detect re-infection.

Illicit drug monitoring Illicit drug use will be recorded at baseline and at end of treatment (week 8 for genotype 3, week 12 for genotype 1). One sample of urine for toxicology will be taken during treatment. Those participants who fail to achieve SVR will be compared to successful participants for any correlation with particular substance use. For any candidate substance associated with failure to achieve SVR not explained by lack of adherence, biological samples will be analysed for biological mechanisms.

Adherence monitoring Adherence of those participants randomised to DOT will be documented on a daily log. Those randomised to fortnightly collection of medication will receive Zepatier tablets in blister packaging. They will return their packets of medication every two weeks and any remaining tablets will be counted. Participants infected with HCV genotype 3 will additionally receive bottles containing Sovaldi tablets. These bottles will be fitted with adherence aid caps that record time and date of each cap opening.

Inclusion Criteria:

• Male or Female. (Age limit 18-70)
• HCV PCR confirmed active infection, genotype 1 or 3.
• If female, must have negative urine test results for pregnancy during initial screening period (for trial inclusion) and be advised of limited safety data in pregnancy.
• Current illicit drug use established through participant history.
• Able to provide informed consent, agreeing to trial and clinical monitoring criteria

Exclusion Criteria:

• Aggressive or violent behaviour.
• Platelet count < 75000000000 /ml
• Alanine transaminase > 350 Units/l
• Inability to provide informed consent.
• Clinical history or abnormal valves for albumin< 30 g/l, Bilirubin >35 umol/l or prothrombin time >1.5 consistent with decompensated liver failure Childs-Pugh B or C
• Clinical history of primary hepatocellular carcinoma
• Pregnancy or breast feeding.
• Participation in a drug trial within the previous 30 days
• Hepatitis B surface antigen positive
• HIV infection.
• Hypersensitivity to elbasvir and grazoprevir
• Hypersensitivity to sofosbuvir (genotype 3 infected-participants ony)
• Currently being treated with an inhibitor of organic anion transporting polypeptide 1B, e.g. rifampicin, atazanavir, daruavir, lopinavir, saquinavir, tipranavir, cobicistat or ciclosporin.
• Currently being treated with inducers of cytochrome P450 3A or P-glycoprotein, such as efavirenz, phenytoin, carbamazepine, bosentan, etravirine, modafinil or St John's Wort (Hypericum perforatum)
• Currently being treated with amiodarone (Participants infected with genotype 3 HCV only)

31 months

Recorded but not reported as Serious Adverse Events:

• Death or hospitalisation for assault or accidental injury
• Hospitalisation for abscesses due to drugs use
• Hospitalisation for wound management due to drugs use
• Death or hospitalisation due to infection
• Hospitalisation for elective or planned investigation or treatment
• Death or hospitalisation for deteriorating renal function, high or low potassium levels
• Hospitalisation due to nausea, vomiting, constipation or diarrhea