The advent of highly effective non-interferon-based treatments (sometimes referred to as direct-acting antivirals, or DAAs), with 90% cure rates, improved tolerability and a comparably short duration of therapy (up to 12 weeks)[1-3],has totally changed the hepatitis C landscape. Since the first regimen of hepatitis C DAA treatments were listed on the PBS in March 2016, an estimated 26, 360 individuals had initiated treatment as of July 2016 , and it is estimated that by end of 2016 >30,000 Australians will be cured of their hepatitis C.
By curing people of their hepatitis C, not only can we prevent many hepatitis C-related deaths, but it is possible to substantially reduce hepatitis C prevalence and incidence by treating those most at-risk of transmitting hepatitis C. There is also growing evidence that there are other benefits to curing people’s hepatitis C, apart from stopping the progression of their liver disease, including increased energy levels, reduced “brain fog”, and reductions in stigma and anxiety experienced.
Preventing hepatitis C transmission through treatment as prevention will require a scale-up of hepatitis C treatment among people who inject drugs (PWID), the highest-risk group for infection and transmission of hepatitis C in Australia .
Throughout the 1990s PWID were restricted from accessing antiviral treatment for hepatitis C, despite no evidence base for this constraint . Even with the removal of these restrictions, few PWID are currently being treated for hepatitis C [7-9].
Since March 1st 2016, we have seen a rapid uptake of hepatitis C DAA treatments across Australia, however the proportion of PWID who have been reached by this initial increase in coverage is still unknown , it is thought to only be a small proportion of people who currently inject drugs. The explanation for poor treatment uptake is multifactorial and includes factors such as the significant side effects of previous treatment options, PWID having difficulties accessing specialist care provided from tertiary hospitals, stigma from health service providers and historically, medical professionals’ hesitations to prescribe due to concerns about treatment compliance and reinfection [10-13].
However, several studies and reviews of hepatitis C treatment for PWID found that they can successfully complete treatment, even in the interferon era. Variation in treatment outcomes between groups with and without injecting histories is small; compliance is high and reinfection risk is low [14, 15].
Unfortunately, even with this evidence and the advent of simple non-interferon-based treatments, many PWID are not currently accessing hepatitis C treatments. Continued efforts are required to ensure that hepatitis C treatments are accessible to PWID.
First and foremost, treating hepatitis C benefits the individuals receiving treatment by reducing their risk of developing chronic liver disease, cirrhosis and hepatocellular carcinoma, and improving their quality of life .
Treating PWID also has a broader public health benefit. Recent mathematical modelling provides strong evidence that treating sufficient numbers of people who currently inject drugs could reduce disease transmission and lower the overall prevalence and incidence of hepatitis C among PWID, leading to virtual elimination of hepatitis C among the general community [16-18].In particular, modelling has estimated that treating approximately 4700 PWID infected with hepatitis C each year would be enough to achieve an 80% reduction in hepatitis C incidence in Australia by 2030, meeting the global targets as outlined below .
With the introduction of these new DAA treatments, elimination of hepatitis C as a public health threat is now a possibility.
The World Health Organization (WHO) released the Global Health Sector Strategy on Viral Hepatitis 2016-2021 earlier this year which outlines the global targets towards achieving elimination of viral hepatitis as a public health threat by 2030. For hepatitis C, this involves an 80% decline in new cases of hepatitis C and 65% reduction in deaths associated with hepatitis C. To achieve this, the targets include ensuring 90% of people living with hepatitis C should be diagnosed with hepatitis C and 80% of eligible persons with hepatitis C should be treated .
The Gastroenterological Society of Australia released the Australian recommendations for the management of hepatitis C virus infection: a consensus statement 2016. This document outlines the recommendations for screening, diagnosis, treatment and monitoring. Of particular importance for PWID are the recommended models of care which would work towards improving access to care among PWID, as described below .
Interventions aimed at increasing access for PWID to hepatitis C treatment in community clinics will benefit individual PWID and reduce hepatitis C prevalence. To do this successfully, funding is required to:
There is evidence that GPs’ knowledge about hepatitis C diagnosis and management in the primary care setting in Australia is poor . Therefore, with the advent of interferon-free treatment, it is vital that we:
Many PWID have limited knowledge about hepatitis C in general and the new interferon-free treatments in particular . Therefore, we need to increase the knowledge of PWID about the new hepatitis C treatments and what is involved in the management of hepatitis C more broadly.
Hepatitis C Virus Infection Consensus Statement Working Group. Australian recommendations for the management of hepatitis C virus infection: a consensus statement. Melbourne: Gastroenterological Society of Australia, 2016
Aspinall EJ, Corson S, Doyle JS, et al. Treatment of hepatitis C virus infection among people who are actively injecting drugs: a systematic review and meta-analysis. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America. Aug 2013; 57 Suppl 2:S80-89
Hellard, M., E. McBryde, et al. Hepatitis C transmission and treatment as prevention - The role of the injecting network. International Journal of Drug Policy. 2015; 26(10): 958-962.
Martin NK, Vickerman P, Grebely J, et al. Hepatitis C virus treatment for prevention among people who inject drugs: Modeling treatment scale-up in the age of direct-acting antivirals. Hepatology. Nov 2013; 58(5):1598-1609
Scott N, McBryde ES, Thompson A, Doyle JS, Hellard ME. Treatment scale-up to achieve global HCV incidence and mortality elimination targets: a cost-effectiveness model. Gut. 2016; doi:10.1136/gutjnl-2016-311504.
Scott N, Hellard M, McBryde E. Modelling hepatitis C virus transmission among people who inject drugs: assumptions, limitations and future challenges. Virulence. 2015; 7: 201-208.
Wade AJ, Macdonald DM, Doyle JS, Gordon A, Roberts SK, et al. The Cascade of Care for an Australian Community-Based Hepatitis C Treatment Service. PLOS ONE. 2015; 10(11): e0142770. doi: 10.1371/journal.pone.0142770