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HDV, Hepatitis D Drug Development, Hepatitis Delta (HDV), Research

What You Need to Know About the 2022 Liver Meeting and How It Relates to Hepatitis Delta

 

 

 

 

This year, the annual Liver Meeting, hosted by the American Association for the Study of Liver Diseases (AASLD), was held in Washington, D.C. The featured presentations included new innovations in liver transplant surgery, disease modeling (which is a process that uses cells to show how a disease develops and to test possible treatment approaches), and drug development. While an effective, functional cure for hepatitis B virus (HBV) is still 5-10 years away, researchers, scientists, healthcare providers, and people with lived experience all came together and agreed that more needs to be done to reduce the burden of liver diseases and improve health outcomes now. One highlight of the meeting was Dr. Francis Collins, former director of the U.S. National Institutes of Health and special advisor to President Biden, hosting a special session to introduce a national hepatitis C elimination plan for the U.S. Unfortunately, this plan is focused on hepatitis C. As a response, the Hepatitis B Foundation will soon send an advocacy letter pushing for the inclusion of hepatitis B and hepatitis delta in this plan. Make sure you are signed up for our Action Center alerts to stay engaged with hepatitis B advocacy efforts.

Of particular note at this year’s meeting were the presence of many patient advocates and people with lived experience, and an increased focus on hepatitis delta. One important hepatitis delta poster presentation was delivered by Dr. Tatyana Kushner of Mount Sinai Hospital in New York City, entitled “HDV Patient Perspective: The Impact of Disease and Current Unmet Needs.” By including the perspectives of people living with hepatitis delta virus (HDV), this study aimed to empower the patient community. Dr. Kushner and her colleagues collected data on people’s quality of life to identify unmet needs, barriers and gaps in HDV care (including disease management and access-to-care inequities).

The researchers found that a person’s care is affected in two ways: In the care they receive for their clinical diagnosis and their emotional journey after diagnosis. The participants’ experience of care was often negatively impacted by having a delayed HDV diagnosis, and limited access to specialized care and tolerable treatment options. Findings describe that the lack of specific and acceptable treatment options for hepatitis delta left people with little hope, which put an emotional burden on their life post-diagnosis. Due to the gaps in providers’ knowledge of HDV, participants held little trust in their healthcare providers. The study participants also shared that they suffered emotionally due to the stigma attached to their diagnosis.

Dr. Kushner and her colleagues call for an increased effort to educate healthcare providers on hepatitis delta, as their lack of HDV-specific knowledge drives health disparities or differences between groups, where one group is more burdened by a disease than the other. These are driven by unequal opportunities to achieve good health (CDC, 2020). Health disparities are preventable, and educating providers is the first step to overcoming these inequalities. Educating providers on HDV will lead to more rapid identification of the disease, as they will have a better understanding of the signs, symptoms and risk factors for hepatitis delta. Increasing advocacy efforts for point-of-care testing for both HBV and HDV in the U.S. will increase levels of testing and earlier identification of people at risk for the diseases. Timely diagnosis allows for people to be linked to specialty care earlier, ultimately improving health outcomes. Improving community awareness of HDV will combat stigma and likely reduce testing hesitancy, which can improve health outcomes. The researchers call for drug developers to meet the needs of the patient community by developing tolerable and hepatitis delta-specific treatments.

In terms of drug development, researchers presented on antiviral treatments for people living with HDV and discussed preferred outcomes of treatment, based on what they believed to be most helpful to each individual’s physical health. To understand these treatment considerations, it is important to review how HDV functions. Hepatitis delta virus (HDV) uses a person’s RNA (ribonucleic acid) to produce and replicate the virus, so high HDV RNA levels in the blood indicate severe infection, and low or undetectable HDV RNA levels indicate that the virus is not rapidly reproducing (Stephenson-Tsoris & Casey, 2022). A virological response is defined as a long-term period of low-level replication that leads to undetectable HDV RNA levels in the blood six months after stopping treatment, and this indicates viral suppression (Yamashiro et al., 2004). A biochemical response is defined as normalization of alanine aminotransferase (ALT) levels after antiviral treatment (Kim et al., 2022). When liver cells are damaged, they release ALT into the bloodstream, so high levels of ALT indicate that one’s liver is diseased or damaged (MedlinePlus, n.d.). ALT normalization is considered a good indicator that antiviral therapy is working because it means that there is less liver damage, liver disease is less severe, and people living with HBV/HDV are at less risk of harm (Kim et al., 2022).

One study of interest from the meeting was the D-LIVR study by Eiger BioPharmaceuticals, Inc.: Lonafarnib Global Study in Chronic Hepatitis Delta. This study consisted of 400 participants, who were all on treatment for 48 weeks, then followed up with researchers 24 weeks after treatment. In total, 50 participants received pegylated interferon (Peg IFN) treatment for 48 weeks; 125 participants received a combination of Lonafarnib, Ritonavir and Peg IFN; and 175 participants received the oral antiviral therapy Lonafarnib and Ritonavir. There were also 50 people on a placebo treatment. A placebo is a harmless pill that has no effect on a person, and is often used in clinical trials to test the effectiveness of a specific treatment being studied, in this case, Peg IFN, Lonafarnib and Ritonavir (Harvard Health Publishing, 2021). The researchers decided that they wanted to see a decline in HDV RNA (virologic response) and normalization of ALT (biochemical response) at week 48 as their study’s main outcome or proof that the treatment could work. In this study, an acceptable virologic response was defined as a “2log decline of HDV RNA levels,” which means they wanted to see HDV RNA levels decrease by 99% from the original levels that were measured before starting treatment (Wikipedia, n.d.).

Pegylated interferon (Peg IFN) is a protein-based medication that prompts the body to activate its natural immune system (induce innate antiviral response) (Zhang & Urban, 2021; Drugbank, n.d.). For Peg IFN-based treatments, researchers determine that undetectable HDV RNA six months after stopping treatment is desirable. However, researchers emphasize the importance of yearly HDV RNA post-treatment screening to monitor for viral relapses after treatment. For long-term treatment (over 48 weeks), a 99% reduction of HDV RNA concentration levels is an appropriate virologic response for non-interferon-based treatments, but more studies must be done to establish whether a person living with hepatitis delta is actually benefiting from the treatment (this is called clinical benefit). When establishing the clinical benefits for non-interferon-based treatments (or any new treatment), researchers can measure delays in disease progression or improvement of signs and symptoms of the disease, which includes symptom relief, improved functioning and improved survival rates (Lee, n.d).

Based on a variety of extensive studies (not just D-LIVR), the researchers decided to combine virologic and biochemical responses to try to demonstrate the clinical benefit of using ongoing antiviral treatment as a functional cure for hepatitis delta. They concluded that acceptable endpoints for HDV treatment studies include undetectable HDV RNA six months after stopping treatment, the loss of the hepatitis B surface antigen (HBsAg), and ALT normalization in people living with chronic hepatitis delta. This can also be considered a functional cure since there are undetectable levels of HBsAg and HDV RNA in the blood for a sustained period of time, even after finishing treatment (Wong et al., 2022).

While there is still time before we overcome the burden of hepatitis delta, the presentations from The Liver Meeting show us that researchers and scientists are constantly working to improve the lives of people living with hepatitis delta. Development toward a functional cure is progressing, and advocates are incorporating peoples’ lived experiences and perspectives into drug development and education. Collaboration between all these groups is the best way to move forward in the fight against hepatitis delta.

For more information on hepatitis delta, you can visit the Hepatitis Delta Connect website or review this hepatitis delta fact sheet.

References

Centers for Disease Control and Prevention. (2020). Health disparities. Centers for Disease Control and Prevention, Division of Adolescent and School Health, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention. https://www.cdc.gov/healthyyouth/disparities/index.htm 

Drugbank. (n.d.). Peginterferon alfa-2a. Drugbank. https://go.drugbank.com/drugs/DB00008

Harvard Health Publishing. (2021, December 13). The power of the placebo effect. Harvard Health Publishing, Harvard Medical School. https://www.health.harvard.edu/mental-health/the-power-of-the-placebo-effect 

Kau, A., Vermehren, J., & Sarrazin, C. (2008). Treatment predictors of a sustained virologic response in hepatitis B and C. Journal of Hepatology, 49(4), 634-651. https://doi.org/10.1016/j.jhep.2008.07.013

Kim, S. H., Cho, E. J., Jang, B. O., Lee, K., Choi, J. K., Choi, G. H., Lee, J. H., Yu, S. J., Kim, Y. J., Lee, Y. B., Yoon, J. H., Kim, J. W., Jeong, S. H., & Jang, E. S. (2022). Comparison of biochemical response during antiviral treatment in patients with chronic hepatitis B infection. Liver International: Official Journal of the International Association for the Study of the Liver, 42(2), 320–329. https://doi.org/10.1111/liv.15086 

Lee, J. (n.d.). Defining Clinical Benefit in Clinical Trials: FDA Perspective [Presentation]. U.S. Food and Drug Administration, Center for Drug Evaluation and Research. https://celiac.org/main/wp-content/uploads/2015/04/great3-07.pdf 

MedlinePlus. (n.d.). ALT blood test. National Library of Medicine (U.S.). [updated August 3, 2022]. https://medlineplus.gov/lab-tests/alt-blood-test/ 

Raman, S. (2022 October 25). Administration eyes national hepatitis C treatment plan. Roll Call: Policy. https://rollcall.com/2022/10/25/administration-eyes-national-hepatitis-c-treatment-plan/ 

Stephenson-Tsoris, S., & Casey, J. L. (2022). Hepatitis delta virus genome RNA synthesis initiates at position 1646 with a nontemplated guanosine. Journal of Virology, 96(4), e0201721. https://doi.org/10.1128/JVI.02017-21 

Wikipedia. (n.d). Log reduction. https://en.wikipedia.org/wiki/Log_reduction

Wong, G. L. H., Gane, E., & Lok, A. S. F. (2022). How to achieve functional cure of HBV: Stopping NUCs, adding interferon or new drug development?. Journal of Hepatology, 76(6), 1249–1262. https://doi.org/10.1016/j.jhep.2021.11.024

Yamashiro, T., Nagayama, K., Enomoto, N., Watanabe, H., Miyagi, T., Nakasone, H., Sakugawa, H., & Watanabe, M. (2004). Quantitation of the level of hepatitis Delta virus RNA in serum, by real-time polymerase chain reaction—and its possible correlation with the clinical stage of liver disease. The Journal of Infectious Diseases, 189(7), 1151–1157. https://doi.org/10.1086/382133

Zhang, Z., & Urban, S. (2021). New insights into HDV persistence: The role of interferon response and implications for upcoming novel therapies. Journal of Hepatology, 74(3), P686-699. https://doi.org/10.1016/j.jhep.2020.11.032

Clinical Trials, HDV, Hepatitis D Drug Development, Hepatitis Delta (HDV), News, Research

Results from Hepatitis Delta Clinical Trials Announced at International Liver Congress 2022

London, UK was the host city for this year’s annual International Liver Congress (ILC), the yearly meeting of the European Association for the Study of the Liver (EASL), which took place from June 22nd-26th. This meeting provides an opportunity for those working to address liver diseases around the world to gather in one location and exchange ideas, present research, and work to advance diagnosis, prevention, treatment, and elimination of these serious conditions. This year’s meeting saw significant attention given to hepatitis delta, as new treatments continue to move through the pipeline and more widespread approval for prescription of current treatments is sought. Below is a quick snapshot of some of the presentations!

The US-based pharmaceutical company Gilead Sciences, Inc. demonstrated with results from a Phase 3 clinical trial that treatment with Hepcludex (bulevirtide), the first medication ever approved for hepatitis delta (HDV), has been shown to achieve significant response in chronic HDV. After 48 weeks, 48% of study participants who received different doses of treatment with Hepcludex achieved virological response (meaning a decline in hepatitis delta viral load, ALT normalization, and a change in liver stiffness), compared to only 2% of those who had not received any treatment. When compared to results from clinical trials after 24 weeks, response rates to HDV only improved, showing the drug to be even more effective over time. Throughout the clinical trials, there have been no adverse events reported that are attributable to this treatment.

Hepcludex has also been found to have a positive impact on the quality of life of individuals living with hepatitis delta, and their overall ability to manage the condition. There were improvements found in health distress, performance of daily activities related to hepatitis, emotional impact of hepatitis, and ability to work. This data reinforces the efficacy and safety of Hepcludex and hopefully strengthens the case for approving the drug in more parts of the world.

“As the most severe form of viral hepatitis, HDV presents a significant disease burden with high healthcare-related costs and until recently, no approved treatment options,” said Heiner Wedemeyer, MD, Director, Clinic for Gastroenterology, Hepatology and Endocrinology at Hannover Medical School, and principal investigator of the study. “These results presented at ILC 2022 not only highlight the important clinical role that bulevirtide has to play as a safe and effective treatment option for chronic HDV, but critically also demonstrate that with prolonged treatment, we can achieve higher response rates so we can better manage this rare, life-threatening disease in more people.”

Presently, Hepcludex has been conditionally approved by the European Commission for prescription in France, Germany, and Austria. It has not yet been approved by the United States Food and Drug Administration (FDA) or in other countries. A Biologics License Application was submitted by Gilead to the FDA in late 2021 for injection of 2mg of Hepcludex to treat adults with HDV and compensated liver disease. Hepcludex had previously been granted Breakthrough Therapy and Orphan Drug designations by the FDA and PRIority MEdicines (PRIME) scheme eligibility by the European Medicines Agency (EMA).

The second company to present their research findings at the ILC was US-based Eiger BioPharmaceuticals, Inc. The two primary hepatitis delta drugs that they have in the pipeline are called lonafarnib and peginterferon lambda. One abstract presentation indicated that peginterferon lambda (lambda) had better antiviral activity and tolerability than peginterferon alfa (the previous version of this drug that has been used as the only somewhat effective, but off-label treatment for hepatitis delta since the early 1980s). Lambda has been shown to block production of new hepatitis delta virus very effectively. Additionally, lambda in combination with lonafarnib was found to lower levels of HDV RNA and decrease its production and release, more effectively than lambda by itself. Patterns in HBV DNA, hepatitis B surface antigen, and ALT were also observed as part of this study. In its Phase 3 D-LIVR study, which is assessing the safety and efficacy of lonafarnib in combination with ritonavir, with and without peginterferon alfa, Eiger has assembled the largest cohort of global participants in an HDV study, and therefore the largest body of data. Results from this study are anticipated by the end of 2022.

The final piece of big hepatitis delta news to come out of the conference was the announcement from Vir Biotechnology Inc. that they are beginning a Phase 2 clinical trial for VIR-2218 in combination with VIR-3434 for the treatment of chronic hepatitis delta. Initial data from this study is anticipated in 2023.

Hepatitis delta is now receiving more attention than ever before and there is only more hope as new treatments are created, investigated, approved, and made available. For a complete overview of hepatitis delta, including basic information, resources, clinical trial opportunities, and a complete list of drugs that are in the pipeline, visit www.hepdconnect.org.

References

https://www.gilead.com/news-and-press/press-room/press-releases/2022/6/treatment-with-hepcludex-bulevirtide-meets-primary-endpoint-and-achieves-significant-response-in-chronic-hepatitis-delta-virus-at-48-weeks

https://www.streetinsider.com/Corporate+News/Vir+Biotechnology+Inc.+%28VIR%29+Announces+New+Clinical+Data+From+its+Broad+Hepatitis+B+Program/20256465.html

https://www.prnewswire.com/news-releases/eiger-biopharmaceuticals-announces-results-from-multiple-presentations-at-the-european-association-for-the-study-of-the-liver-easl-international-liver-congress-2022-301576119.html

Clinical Trials, HDV, Hepatitis D Avocacy, Hepatitis D Drug Development, Hepatitis Delta (HDV), News

2022 – The Year of Hepatitis Delta

2022 is shaping up to be a big year for hepatitis delta, the rare but serious virus that can co-infect people who are already living with hepatitis B. As a quick refresher, hepatitis delta is a virus that depends upon the hepatitis B virus in order to survive and replicate – so only those who are already living with hepatitis B can become infected with hepatitis delta. Hepatitis delta virus (HDV) is believed to infect between 5 and 10% of people living with hepatitis B virus (HBV). HDV can occur through either a superinfection or a coinfection. A superinfection occurs when someone who is already living with HBV contracts HDV, in which case there is a very high chance that the individual will develop chronic (lifelong) infections of both HBV and HDV. A coinfection occurs when both HBV and HDV are contracted at the same time – when this happens in adults, both infections tend to clear within six months and there is only a 5% chance that chronic HBV and HDV will occur. Chronic HDV is particularly dangerous because it advances progression to serious liver damage and liver failure much more quickly than HBV alone – 70% of people diagnosed with HDV and HBV will experience serious liver damage within 10 years without intervention, compared to 15-30% of people diagnosed with HBV alone.

So, What’s Happening in the World of Hepatitis Delta?

The past 18 months have been very important for hepatitis delta research and drug development. In July of 2020, the European Medicines Agency approved Hepcludex, the first-ever drug approved for treatment of hepatitis delta, for prescription in France, Austria, and Germany. Hepcludex works by stopping HDV from entering and infecting liver cells (and is known as an entry inhibitor). In 2021, MYR Pharma, the German company that originally developed Hepcludex, was bought by Gilead Sciences, Inc., which is based in the United States, and which has since filed a Biologics Licensing Agreement for approval of Hepcludex by the US Food and Drug Administration, which is expected later this year. At this time, there is not a timeline for when Hepcludex approval will be expanded to more countries and parts of the world. Prior to Hepcludex, the only drug available for hepatitis delta management, which was never officially approved, was called pegylated interferon alpha. This drug, still in use today, is only effective in controlling HDV in about 25% of people living with the virus and has challenging side effects that can negatively impact quality of life.

In addition to Hepcludex, two other promising drugs are in clinical trials, both developed by Eiger BioPharma in the United States. The first of these is called Lonafarnib, which is being evaluated for how well it works to target the protein assembly process, which keeps new viruses from being created (it is known as a prenylation inhibitor). Lonafarnib, in combination with another drug called Ritonavir, is currently in Phase III clinical trials (the phase in which the safety and effectiveness of a drug is compared to that of currently available treatments). These trials are fully enrolled, and data is expected by the end of 2022. Additionally, Eiger is currently enrolling phase III clinical trials for Pegylated Interferon Lambda, which works by stimulating the body’s own immune system to fight the virus. For a full list of drugs under investigation for hepatitis delta, including one from Janssen Research and Development and one from Antios Therapeutics, visit our Drug Watch page.

Are There Other Clinical Trials Happening for Hepatitis Delta?

 Yes! There are clinical trials happening worldwide to test many of the drugs listed above and more. You can check out our clinical trials page here. This page includes a detailed description of each clinical trial, along with information about where it is being conducted and how to contact the principal investigator (or person leading the clinical trial). This page also includes a helpful graphic describing the clinical trial process and what it takes for a drug to move from an idea into the real world. It is important to note that not all of the trials listed here are for the purpose of testing a medication – some are observational studies to monitor what are called disease biomarkers, which are physical measures used to monitor the progress of a disease and could include tests of blood or liver function, for example. Clinical trials are currently happening in Australia, Austria, Belgium, Brazil, Bulgaria, Canada, China, France, Georgia, Germany, Greece, Israel, Italy, Japan, Mongolia, New Zealand, Pakistan, Republic of Moldova, Romania, Russian Federation, Spain, Sweden, Switzerland, Taiwan, Turkey, Ukraine, the United Kingdom, the United States, and Vietnam.

When Will HDV Drugs and Clinical Trials Be More Accessible in More Parts of the World?

 This is unfortunately a difficult question to answer. Even though up to 10% of people who are living with hepatitis B are also living with hepatitis delta, there are not good systems in place to make sure that everyone who is living with HBV or who is at increased risk for HDV is tested and diagnosed, so there are not very accurate numbers about how many people in the world are living with HDV. Indeed, of the nearly 300 million people around the world who are living with hepatitis B alone, only 10% are aware of their diagnosis, so this number is undoubtedly far lower than even 10% for hepatitis delta. Without accurate information about how many people are living with the virus, it is difficult for drug and clinical trial developers to invest resources into studying or pursuing drug development or clinical trials for HDV.

Another problem is the many resources of time, money, and labor that are necessary for developing drugs, and preparing and running clinical trials. The development process for a single drug can take anywhere from 5-15 years and a much larger number of drugs fail to complete this process than succeed. Additionally, there needs to be some degree of existing infrastructure in a particular country in order to both support a clinical trial and ultimately to get a drug approved. Unfortunately, this kind of infrastructure is generally already established and easier to navigate in wealthier countries, so these are the countries in which clinical trials are generally held and in which drug approvals tend to happen first. Public health and clinical infrastructure is slowly developing and becoming more prioritized in different parts of the world and hopefully this trend will continue, but for the time being, the locations of clinical trials and approvals for important treatments point to the much larger issues of lack of access to health and healthcare in much of the world, that in turn stem from deep-seated poverty and inequity. Again, as health equity continues to be a focus of the public eye, these trends will hopefully begin to change, paving the way for greater access to healthcare for hepatitis delta, hepatitis B, and countless other health conditions.

What Is Hep Delta Connect’s Role?

 This year, Hep Delta Connect will continue its work to raise the profile of hepatitis delta, both in the United States and around the world. We are committed to building awareness through partnerships with community-based organizations, healthcare providers, and governmental agencies around the world and through dissemination of educational materials and programming. We hope to foster greater engagement of those living with and affected by hepatitis delta globally, more focused advocacy efforts to bring HDV into the spotlight, and increased screening, diagnosis, and management of HDV. We keep our website and social media channels updated regularly with program news and events – make sure to follow us on Facebook, Twitter, and Instagram and check out our website frequently! You are always welcome to connect with us anytime at connect@hepdconnect.org. We look forward to an exciting year of work on HDV!

Baruch S. Blumberg Institute