Clinical trial NCT06649266: Trial to Evaluate the Efficacy, Safety and Pharmacokinetics of RBD1016 in Participants With Chronic Hepatitis D
Official title: A Phase 2a, Multicentre Trial to Evaluate the Efficacy, Safety and Pharmacokinetics of RBD1016 in Participants With Chronic Hepatitis D Virus Infection, Including a Randomised, Single Blinded, Placebo-controlled Exploratory Part
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE2
Conditions: Chronic Hepatitis D
Lead sponsor: Ribocure Pharmaceuticals AB
Sponsor class: INDUSTRY
First posted: 2024-10-18
Enrollment: 15
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Partly blinded, placebo-controlled clinical trial with an active and a deferred active group.
Primary purpose: TREATMENT

Brief summary: The goal of this clinical trial is to learn if drug RBD1016 works to treat chronic hepatitis D virus infection in adults. It will also learn about the safety of drug RBD1016. The main questions it aims to answer are:

Does drug RBD106 reduce the HDV RNA levels? What medical problems may participants experience when taking drug RBD1016? Researchers will compare drug RBD1016 to a placebo to see if drug RBD1016 works to treat chronic hepatitis D.

Participants will:

Receive drug RBD1016 or a placebo several times throughout the trial. Visit the clinic once every 4-6 weeks for checkups and tests.

Detailed description: This is a multicentre, randomised, partly blinded, placebo-controlled clinical trial to evaluate the efficacy, safety and pharmacokinetics (PK) of RBD1016 subcutaneous injections in participants with chronic HDV infection.

There will be 2 treatment groups - an active group (n=10) and a deferred active group (n=5), with participants allocated randomly. In the active group, participants will receive RBD1016. In the deferred active group, participants will receive 4 doses of placebo followed by deferred treatment with doses of RBD1016.

Both groups will be on a stable nucleoside analogue (NA) treatment course during the trial. All participants will be blinded to the trial treatment for the 16 weeks after the first dose. Then, investigators and other clinic staff will be unblinded, i.e., they will know which treatment the participants receive at all times.

Eligibility criteria: Inclusion Criteria:

1. Willing and able to give written informed consent for participation in the trial.
2. Male or female participant aged 18 to 65 years, inclusive.
3. Body mass index (BMI) ≥ 18 and ≤ 35 kg/m2 at the time of the screening visit.
4. Documented evidence of HDV infection in medical history, i.e., HDV antibodies (HDVAb) and/or HDV RNA positive test results within at least 6 months prior to screening.
5. Documented evidence of HBV infection in medical history, i.e., HBsAg and/or HBV DNA positive test results within at least 6 months prior to screening.
6. Documented absence of liver cirrhosis, defined as an LSM ≥ 10 kPa measured on FibroScan® elastography at screening.

Exclusion Criteria:

1. Laboratory results at screening as follows, or any clinically significant laboratory parameter outliers that may interfere with the evaluation of efficacy and/or safety in the trial, at the discretion of the Investigator:

   * α-fetoprotein (AFP) \&amp;amp;gt; 50 µg/L.
   * Albumin concentration \&amp;amp;lt; 3.0 g/dL.
   * International normalized ratio (INR) \&amp;amp;gt; 1.5.
   * Platelet count \&amp;amp;lt; 90 × 109/L.
   * Direct bilirubin \&amp;amp;gt; 2 × ULN, Gilbert syndrome excluded.
   * Creatinine concentration \&amp;amp;gt; 1.5 × ULN.
   * Creatinine clearance \&amp;amp;lt; 60 mL/min, according to the Cockcroft-Gault equation.
2. Positive result at screening for hepatitis C virus (HCV) and/or human immunodeficiency virus (HIV) and/or prior diagnosis of syphilis, acute hepatitis A and/or acute hepatitis E.
3. Prior diagnosis of other liver diseases of non-HBV or non-HDV aetiology, including autoimmune liver disease (e.g., autoimmune hepatitis, primary biliary cholangitis or primary sclerosing cholangitis), inherited metabolic liver disease (e.g., haemochromatosis, Wilson's disease, familial intrahepatic cholestasis), drug-induced liver disease and/or non alcoholic steatohepatitis (NASH) assessed as moderate or above, at the discretion of the Investigator.
4. Prior or current diagnosis of liver cirrhosis.
5. History of or active hepatic decompensation, e.g., ascites, variceal bleeding or hepatic encephalopathy, at the discretion of the Investigator.
6. History of organ transplantation, previous or concurrent HCC or imaging finding suggesting malignant liver lesions, at the discretion of the Investigator.
7. Signs of liver malignancy in abdominal ultrasound at screening.

Primary outcomes:
measure: Mean change (log10 value) vs. baseline in HDV RNA levels in plasma at end of trial (Week 60).
timeFrame: 60 weeks
Secondary outcomes:
measure: Frequency, intensity and seriousness of reported AEs, SAEs and AEs of special interest (AESIs) during the trial.
timeFrame: 60 weeks
measure: Mean change (log10 value) in HBsAg levels vs. baseline, at end of trial (Week 60).
timeFrame: 60 weeks
measure: Proportion of participants with positive immunogenicity, measured as plasma concentrations of anti-drug antibodies (ADAs), at each evaluation time point up to end of the study at week 60.
timeFrame: 60 weeks
measure: Mean maximum change (log10 value) in HDV RNA levels in plasma vs. baseline, at any timepoint during the study, and up to the end of study at Week 60.
timeFrame: Up to 60 weeks
measure: Mean maximum change (log10 value) in HBsAg levels vs. baseline, at any timepoint during the study, and up to end of study at Week 60.
timeFrame: Up to 60 weeks
measure: For participants with HBsAg levels more than100 IU/mL at baseline: Proportion of participants with HBsAg levels ≤ 10 IU/mL at end of trial (Week 60).
timeFrame: 60 weeks
measure: Proportion of participants with undetectable HDV RNA (i.e., less than the limit of detection), or ≥ 2 log10 decrease in HDV RNA and alanine transaminase (ALT) normalisation, at end of trial (Week 60).
timeFrame: 60 weeks
measure: Proportion of participants with undetectable HDV RNA (i.e., less than the limit of detection) or ≥ 2 log10 decrease in HDV RNA at end of trial (Week 60).
timeFrame: 60 weeks
measure: Plasma concentrations of RBD1016.
timeFrame: 60 weeks
Other outcomes:
Locations:
city: Stockholm
country: Sweden
facility: Medicinsk enhet för Infektionssjukdomar, Karolinska Universitetssjukhuset Huddinge
city: Stockholm
country: Sweden
facility: Infektionskliniken, Danderyds sjukhus
Study officials:
References: