A Phase 2, Multicenter, Randomized, Double-blind, Placebo-Controlled Study With Deferred Active Treatment to Investigate the Efficacy, Safety, and Pharmacokinetics of JNJ-73763989 + Nucleos(t)Ide Analog in Participants Co-Infected With Hepatitis B and Hepatitis D Virus (REEF-D)

  • End date
    Jul 30, 2027
  • participants needed
  • sponsor
    Janssen Research & Development, LLC
Updated on 18 October 2022


The purpose of the study is to evaluate on-treatment efficacy against hepatitis D virus (HDV) of JNJ-73763989 + nucleos(t)ide analog (NA) regimen compared to NA alone.


JNJ-73763989 is a liver-targeted antiviral therapeutic for subcutaneous injection designed to treat chronic hepatitis B virus (HBV) infection via ribonucleic acid interference mechanism. This phase 2 study is designed to evaluate safety and efficacy of JNJ-73763989 in HBV infected patients who are co-infected with HDV. The study consists of 2 parts: Part 1 will evaluate safety, tolerability and antiviral activity of JNJ-73763989 + NA while Part 2 will evaluate the safety and efficacy of the JNJ-73763989 + NA regimen in the treatment of HBV/HDV co-infection. Each part includes 3 phases: Screening phase (from 4 Week up to maximum of 8 weeks), Intervention phase (144 Week for Arm A and 148 Week for Arm B) and Follow-up phase (48 Week). The duration of individual study participation will be between 196 and 204 weeks. Safety and tolerability (including adverse events [AEs] and Serious AEs, laboratory assessments, electrocardiogram [ECG], vital signs, physical examination), efficacy (including HDV ribonucleic acid [RNA], HBV deoxyribonucleic acid [DNA] and antigens) , and pharmacokinetics will be assessed throughout the study.

Condition Hepatitis D, Chronic
Treatment Placebo, Tenofovir disoproxil, Tenofovir alafenamide (TAF), JNJ-73763989, Entecavir (ETV) monohydrate
Clinical Study IdentifierNCT04535544
SponsorJanssen Research & Development, LLC
Last Modified on18 October 2022


Yes No Not Sure

Inclusion Criteria

Medically stable based on physical examination, medical history, vital signs, electrocardiogram (ECG) at screening
Chronic hepatitis B virus (HBV) and hepatitis D virus (HDV) co-infection with documentation at least 6 months prior to screening
For Part 1: hepatitis D RNA (HDV RNA) greater than or equal to (>=) 1000 international units per milliliter (IU/mL) at screening. For Part 2: must have HDV RNA values >= 500 IU/mL, and must have hepatitis B surface antigen (HBsAg) values less than or equal to (<=) 10,000 IU/mL at screening or HDV RNA values at screening are <= 100,000 IU/mL
Alanine aminotransferase (ALT) greater than upper limit normal (ULN) but less than 10 times (ULN)
Body mass index (BMI) between 18.0 and 35.0 kilogram per meter square (kg/m^2), extremes included
Highly effective contraceptive measures in place for female participants of childbearing potential or male participants with female partners of childbearing potential
Non-cirrhotic participants and participants with compensated cirrhosis (Child Pugh class A) at screening (Part 1) and participants must have absence of cirrhosis and platelet count of >= 140,000 per deciliter (dL) for enrollment into Part-2

Exclusion Criteria

Evidence of infection with hepatitis A, C, or E virus infection or evidence of human immunodeficiency, virus type 1 (HIV-1) or HIV-2 infection at screening
History or evidence of clinical signs/symptoms of hepatic decompensation including but not limited to: portal hypertension, ascites, hepatic encephalopathy, esophageal varices or any laboratory abnormalities indicating a reduced liver function as defined in the protocol
Evidence of liver disease of non-HBV/HDV etiology
Signs of hepatocellular carcinoma (HCC)
Significant laboratory abnormalities as defined in the protocol at screening
Participants with a history of malignancy within 5 years before screening
Abnormal sinus rhythm or ECG parameters at screening as defined in the protocol
History of or current cardiac arrhythmia or history or clinical evidence of significant or unstable cardiac disease
Participants with any current or previous illness for which, in the opinion of the investigator and/or sponsor, participation would not be in the best interest of the participant
History of or current clinically significant skin disease or drug rash
Participants with known allergies, hypersensitivity, or intolerance to JNJ-3989 or its excipients or excipients of the placebo content
Contraindications to the use of entecavir (ETV), tenofovir disoproxil, or tenofovir alafenamide (TAF) per local prescribing information
Participants who have taken any therapies disallowed per protocol
Female participants who are pregnant, or breast-feeding, or planning to become pregnant while enrolled in this study or within 90 days after the last dose of study intervention
Male participants who plan to father a child while enrolled
Participants who had or planned major surgery, (example, requiring general anesthesia) or who have received an organ transplant
Vulnerable participants (example, incarcerated individuals, individuals under a legal protection measure)
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer  to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact


Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

Learn more

Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

Learn more

Similar trials to consider


Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note