Assembly Biosciences Presents New Data Highlighting Hepatitis D Virus Entry Inhibitor ABI-6250 at the EASL Congress™ 2024

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Assembly Biosciences showcased new preclinical data for ABI-6250, an orally bioavailable hepatitis D virus (HDV) entry inhibitor, at the EASL Congress 2024. The data underline ABI-6250's potential to block HDV from entering cells, targeting the NTCP bile acid transporter with high selectivity. The preclinical results showed effective inhibition of HDV infection and NTCP-mediated bile acid uptake, supporting once-daily oral dosing. Clinical trials are expected to begin by the end of 2024. Chronic HDV is a severe viral hepatitis form, leading to liver complications and potential death. ABI-6250 promises to be a significant therapeutic innovation in viral hepatitis treatment.

  • Preclinical data for ABI-6250 show effective HDV inhibition at low nanomolar levels.
  • ABI-6250 demonstrates selectivity for NTCP bile transporter, reducing potential side effects.
  • In vivo results indicate ABI-6250's efficacy in engaging the NTCP target.
  • The pharmacokinetic profile supports low, once-daily oral dosing, improving patient compliance.
  • Clinical trials for ABI-6250 are set to begin by the end of 2024, accelerating potential market entry.
  • ABI-6250 is still in preclinical stages; efficacy and safety in humans remain untested.
  • There is a long timeline before potential market availability, creating uncertainty for investors.
  • The success of clinical trials is uncertain and could lead to potential financial losses if unsuccessful.

ABI-6250 represents a significant step forward in the treatment of chronic hepatitis D, a disease with few current treatment options. The preclinical data suggests that ABI-6250 is effective at low concentrations in inhibiting HDV infection, which is encouraging for its potential effectiveness in humans. The drug's selectivity for the NTCP bile transporter is another positive aspect, since it reduces the risk of off-target effects that can lead to side effects. The pharmacokinetic profile supporting once-daily dosing is patient-friendly, enhancing compliance.

However, investors should be cautious as these results are preclinical. The transition from preclinical to clinical trials often brings unexpected challenges. The results in humans might not mirror those observed in vitro or in animal models. Additionally, while the elevation of bile acids indicates NTCP target engagement, long-term effects of this elevation require thorough investigation.

In the short-term, this news might create a positive buzz around Assembly Biosciences, potentially impacting their stock positively as investors anticipate the start of clinical trials. In the long-term, the true value will depend on the clinical trial outcomes and eventual FDA approval or other global regulatory approvals.

Assembly Biosciences is making strides with ABI-6250 and its progress into Phase 1 clinical trials is a milestone. If successful, ABI-6250 could tap into the market for chronic hepatitis D treatments, which is currently underserved. The preclinical results are promising, indicating potential for a once-daily oral treatment, which could be highly attractive from a commercial perspective.

From a financial standpoint, the cost of moving into clinical trials is substantial. Investors should consider the funds needed for Phase 1 studies and subsequent trial phases, which can be capital intensive. Yet, the market opportunity is significant if the drug proves effective and safe, potentially leading to high returns on investment.

In the short-term, the announcement may boost investor confidence and stock price due to the positive preclinical data and upcoming clinical trials. In the long-term, investors should be mindful of the clinical trial risks and costs and the competitive landscape for antiviral drugs.

-- Poster highlights promising preclinical profile of ABI-6250 ahead of entry into the clinic, expected by end of 2024 --

SOUTH SAN FRANCISCO, Calif., June 05, 2024 (GLOBE NEWSWIRE) -- Assembly Biosciences, Inc. (Nasdaq: ASMB), a biotechnology company developing innovative therapeutics targeting serious viral diseases, today announced new data for ABI-6250, the company’s orally bioavailable, small molecule hepatitis D virus (HDV) entry inhibitor candidate, featured in a poster presentation at the European Association for the Study of the Liver (EASL) Congress™, taking place June 5-8, 2024, in Milan, Italy.

The poster presentation “Preclinical profiling of ABI-6250, a novel orally bioavailable small-molecule therapeutic candidate for the treatment of chronic hepatitis D” will highlight preclinical data that support the advancement of ABI-6250 into Phase 1 clinical studies.

Chronic HDV infection is considered the most serious form of viral hepatitis, and can result in liver cirrhosis, liver cancer, decompensated liver disease or death. ABI-6250 acts to prevent the entry of HDV into cells by blocking access to the sodium taurocholate cotransporting polypeptide (NTCP) bile acid transporter, which is a clinically validated target for HDV infection.

Results from preclinical evaluation included in this presentation demonstrate that ABI-6250 can effectively inhibit, at low nanomolar levels, HDV infection of the most prevalent genotypes (HDV-1,-2 and-3) in HepG2-NTCP cells. ABI-6250 also effectively inhibited NTCP-mediated bile acid uptake and demonstrated selectivity for the NTCP bile transporter versus other transporters in vitro. In vivo, ABI-6250 elevated total bile acids, indicating NTCP target engagement without increasing biomarkers for inhibition of other transporters, supporting the selectivity seen in vitro and providing a biomarker for target engagement in Phase 1a studies. The presentation also describes the preclinical pharmacokinetic (PK) profile of ABI-6250, which supports low, once-daily oral dosing in individuals with chronic HDV.

“Serious viral hepatitis caused by chronic HDV infection impacts millions of people globally, with limited treatment options available for this devastating disease,” said Anuj Gaggar, MD, PhD, chief medical officer of Assembly Bio. “The preclinical data presented at EASL support the advancement of ABI-6250 into clinical development and underscore the early promise of the therapy as a once-daily, oral treatment option, which would represent an important therapeutic innovation similar to what we’ve seen for other chronic viral infections such as hepatitis B virus and HIV. We look forward to moving ABI-6250 into the clinic later this year and sharing further data with the liver disease community.”

Assembly Bio intends to make the presentation available on the “Events & Presentations” page in the “Investors” section of its website at ABI-6250 is an investigational product candidate that has not been approved anywhere globally, and its safety and efficacy have not been established.

About Assembly Biosciences
Assembly Biosciences is a biotechnology company dedicated to the development of innovative small-molecule antiviral therapeutics designed to change the path of serious viral diseases and improve the lives of patients worldwide. Led by an accomplished team of leaders in virologic drug development, Assembly Bio is committed to improving outcomes for patients struggling with the serious, chronic impacts of herpesvirus, hepatitis B virus (HBV) and hepatitis delta virus (HDV) infections. For more information, visit

Forward-Looking Statements
The information in this press release contains forward-looking statements that are subject to certain risks and uncertainties that could cause actual results to materially differ. These risks and uncertainties include: Assembly Bio’s ability to realize the potential benefits of its collaboration with Gilead, including all financial aspects of the collaboration and equity investments; Assembly Bio’s ability to initiate and complete clinical studies involving its therapeutic product candidates, including studies contemplated by Assembly Bio’s collaboration with Gilead, in the currently anticipated timeframes or at all; the occurrence of any event, change or other circumstance that could give rise to the termination of Assembly Bio’s collaboration with Gilead; safety and efficacy data from clinical or nonclinical studies may not warrant further development of Assembly Bio’s product candidates; clinical and nonclinical data presented at conferences may not differentiate Assembly Bio’s product candidates from other companies’ candidates; results of nonclinical studies may not be representative of disease behavior in a clinical setting and may not be predictive of the outcomes of clinical studies; and other risks identified from time to time in Assembly Bio’s reports filed with the U.S. Securities and Exchange Commission (the SEC). You are urged to consider statements that include the words may, will, would, could, should, might, believes, hopes, estimates, projects, potential, expects, plans, anticipates, intends, continues, forecast, designed, goal or the negative of those words or other comparable words to be uncertain and forward-looking. Assembly Bio intends such forward-looking statements to be covered by the safe harbor provisions contained in Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. More information about Assembly Bio’s risks and uncertainties are more fully detailed under the heading “Risk Factors” in Assembly Bio’s filings with the SEC, including its most recent Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. Except as required by law, Assembly Bio assumes no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

Investor and Corporate: 
Shannon Ryan 
SVP, Investor Relations, Corporate Affairs and Alliance Management 
(415) 738-2992

Sam Brown Inc.
Hannah Hurdle
(805) 338-4752 


What is ABI-6250?

ABI-6250 is an orally bioavailable small-molecule hepatitis D virus (HDV) entry inhibitor developed by Assembly Biosciences.

What did the preclinical data for ABI-6250 show?

The preclinical data demonstrated that ABI-6250 effectively inhibits HDV infection and NTCP-mediated bile acid uptake at low nanomolar levels.

When will ABI-6250 enter clinical trials?

ABI-6250 is expected to enter Phase 1 clinical trials by the end of 2024.

What is the significance of NTCP in HDV treatment?

NTCP is a clinically validated target for HDV infection, and ABI-6250 blocks HDV from entering cells by targeting the NTCP bile acid transporter.

What is the potential impact of ABI-6250 on HDV treatment?

If successful, ABI-6250 could offer a once-daily oral treatment option for chronic HDV, representing a significant therapeutic innovation.

Where was the data for ABI-6250 presented?

The data was presented at the European Association for the Study of the Liver (EASL) Congress 2024 in Milan, Italy.

Assembly Biosciences, Inc.


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