Therapeutic Safety and Efficacy of REP 9AC (REP 2055) in HBV or HCV Infected Patients

January 4, 2016 updated by: Replicor Inc.

REP 9AC (REP 2055) is a nucleic acid polymer (NAP) with entry activity against hepatitis C virus and entry and post-entry antiviral activity against duck hepatitis B virus (DHBV) infection. REP 2055 has been shown to have potent prophylactic effect against HCV infection in vivo and potent therapeutic effect against established DHBV infection in vivo

The REP 101 protocol is the first-in-man proof of concept study designed to investigate the safety and antiviral activity of REP 2055 administration in human patients with chronic HBV or HCV infection.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Chronic hepatitis B and C are long term conditions caused by infection of the body with the hepatitis B (HBV) and C (HCV) viruses. These infections often result in inflammation or scarring of the liver and can eventually lead to liver cirrhosis and liver failure. These infections are also one of the major causes of the development of hepatocellular carcinoma (liver cancer).

Although some drugs have been approved to treat chronic hepatitis B infections, they do not provide a complete cure except in rare cases (a cure generally means that a person loses the hepatitis B virus and develops protective surface antibodies). However, these drugs significantly decrease the risk of liver damage from the infection by slowing or stopping the virus from reproducing. Amongst the problems associated with currently available drugs are the tendency to develop resistance and the lack of clearance of the virus from the hepatocytes. There is clearly a need to identify new drugs that can benefit patients with chronic hepatitis B infections. REP 9AC is a 40mer phosphorothioate oligonucleotide that has been shown to have low toxicity and to be highly effective to treat hepatitis B infection in animals. It has been shown to be effective in protecting animal from infection and to treat animals already infected.

The efficacy of REP 9AC (REP 2055) in duck hepatitis B has been tested in collaboration with Dr. Allison Jilbert (University of Adelaide, Australia), who is a recognized expert on HBV infections. These results suggest that REP 2055 can completely eliminate the disease in a large proportion (50%) of animals following only 4 weeks of treatment. In other words, following cessation of the treatment, the viral titer does not return. If these results are replicated in humans, this will result in a paradigm shift in how patients with hepatitis B are treated. Currently available drugs can only control the disease. Once they are stopped, the viral titer returns.

This proposed study is designed to demonstrate that REP9AC can be well tolerated when given to human patients chronically infected with HBV and to evaluate if a reduction of viral titers can be observed when REP 9AC is administered as a monotherapy. Current interim data analysis from the REP 101 trial indicates the following:

  1. REP 9AC is generally well tolerated at doses up to 600mg / week in all patients currently enrolled and in HBV patients at 400mg / day (for seven continuous days).
  2. REP 9AC has resulted in both HBV patients achieving protective seroconversion (anti-HBs) and clearance of HBV DNA and HBsAg in their blood by 23 weeks after initiation of treatment.
  3. Increasing frequency and dose of REP 9AC treatment at the start of therapy may provide more rapid seroconversion of HBV patients.
  4. Increasing frequency and dose of REP 9AC treatment at the start of therapy may provide better efficacy for HCV patients.

Hepatitis C. Recent advances in the treatment of hepatitis C, using interferon and ribavirin combination therapy, have brought overall response rates to about 50% but these responses are associated with significant costs and toxicities. In view of the lack of response of many patients to standard therapy and in view of its associated toxicities, the development of new therapeutic strategies is critically important. Amphipathic polymers have been shown to have broad spectrum antiviral activities and to have very favorable pharmacokinetics in the liver making them ideal candidates for the therapy of viral hepatitis B and C.

In collaboration with Dr. Jake Liang, (Head, Liver Diseases Branch, National Institute of Health, USA), REP 9AC has been shown to provide complete protection from HCV infection in naïve animals. REP 9AC is perfectly suited for the treatment of chronic HCV infection as exposure to this drug will allow the liver to naturally eliminate infected cells by halting the continual cycle of infection of healthy liver cells. REP 9AC may eventually replace pegylated interferon and ribavirin as the standard of care owing to its activity against all genotypes of HCV and its novel mechanism of action, which does not promote the generation of drug resistance.

An entry inhibitor could be useful when used in combination therapy or could be effective as a monotherapy. This proposed study is designed to demonstrate that REP 9AC can be well tolerated when given to patients chronically infected with HCV and to evaluate if a reduction of viral titers can be observed when REP 9AC is administered as a monotherapy.

REPLICor's technology utilizes the novel properties of modified oligonucleotides (phosphorothioate oligonucleotides) as amphipathic polymers to inhibit interactions critical for viral activity. This technology is active in vitro against all known families of enveloped viruses. REPLICor's proof of concept compounds, REP 9 (REP 2006) and REP 9C (REP 2031) and its lead compound, REP 9AC (REP 2055) have also demonstrated potent antiviral activity in vivo against the following viral infections: HCV, HBV (DHBV), Cytomegalovirus, Herpes simplex virus-2, Ebola, influenza and respiratory syncytial virus.

REP 9, REP 9C and REP 9AC have been administered at therapeutically active doses in acute and chronic regimens by multiple routes of administration (parenteral, oral, topical and aerosol) in mice, rats, hamsters, guinea pigs, ducks and non human primate species with no detectable side effects. Moreover, this class of chemical compounds (phosphorothioate oligonucleotides) are known to have been well tolerated in human patients in several clinical trials.

Study Type

Interventional

Enrollment (Actual)

8

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Bangladesh
      • Dhaka, Bangladesh, 1213
        • Farabi General Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 55 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria (HBV):

  • HBsAg+ for at least 6 months prior to initiation of treatment.
  • HBeAg+
  • HBV titer > 20000 copies/ml at start of treatment
  • Treatment naïve
  • HIV / hepatitis delta / HCV negative
  • Compensated liver disease
  • Ishak score ≤ 2
  • Non cirrhotic
  • No known active cytomegalovirus infection
  • Willingness to utilize adequate contraception while being treated with REP 9AC (REP 2055) and for 6 months following the end of treatment
  • Adequate venous access allowing weekly intravenous therapies and blood tests

Inclusion Criteria (HCV):

  • HCV positive for at least 6 months prior to initiation of treatment
  • Genotype 3
  • HCV titer >3log IU/ml at start of treatment
  • Treatment naïve
  • HIV / hepatitis delta / HBV negative
  • Compensated liver disease
  • Chronic alanine aminotransferase or aspartate aminotransferase elevation for 6 months prior to treatment
  • Ishak score ≤ 2 (patients should only have mild fibrosis)
  • Non cirrhotic
  • No known active cytomegalovirus infection
  • Willingness to utilize adequate contraception while being treated with REP 9AC (REP 2055) and for 6 months following the end of treatment
  • Adequate venous access allowing weekly intravenous therapies and blood tests

Exclusion Criteria (HBV + HCV):

  • Evidence of cardiovascular disease
  • Autoimmune hepatitis
  • Presence of Wilson's disease
  • Presence of severe NAFLD
  • Evidence of any other co-existent liver disease
  • Anti-nuclear antibody): positive
  • Anti-HIV 1: positive
  • Evidence of liver cirrhosis
  • A history of ascites, hepatic encephalopathy or variceal hemorrhage
  • Body weight > 100 kg
  • Platelet count < 75,000, polymorphonuclear cell count < 1,500 or hematocrit < 33%
  • Alfa feto protein > 100 ng/ml or the presence of a hepatic mass suggestive of hepatocellular carcinoma.
  • Bilirubin > 2.5 mg/dl
  • Creatinine > 1.5 mg/dl
  • Platelets count < 75,000 / cmm
  • Serum albumin < 35 mg/ml
  • Poorly controlled diabetes mellitus
  • Another serious medical disorder
  • A serious psychiatric disorder
  • Uncontrolled hypertension
  • A history of alcohol abuse within the last year
  • The use of illicit drugs within the past two years
  • Inability to provide informed consent
  • Positive pregnancy test
  • Breastfeeding
  • Inability or unwillingness to undergo a liver biopsy.
  • Inability or unwillingness to provide weekly blood samples
  • Poor venous access making weekly IV infusion too difficult

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: REP 2055
Treatment with REP 2055
Drug: REP 2055

(First two patients) REP 2055 is administered once weekly by slow IV infusion in dose escalation from 100 to 1200mg until a grade 3 adverse event is observed not to exceed 40 weeks of dosing.

(Subsequent patients) 400mg of REP 2055 is administered by slow IV infusion. First week of infusion to include daily dosing followed by twice weekly dosing for 40 weeks.

Other Names:
  • REP 9AC

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety and tolerability of REP 2055 treatment
Time Frame: 40 weeks (treatment)
To record side effects, symptoms and adverse effects of REP 2055 exposure including laboratory test abnormalities.
40 weeks (treatment)

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Efficacy of REP 2055 treatment
Time Frame: 40 weeks (treatment) + 57 weeks (follow up)
To assess antiviral activity of REP 2055 including serum HBsAg, HBeAg, anti-HBsAg antibodies, anti-HBeAg antibodies and HBV DNA.
40 weeks (treatment) + 57 weeks (follow up)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Replicor Inc.

Investigators

  • Principal Investigator: Mamun Al-Mahtab, MD, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2009

Primary Completion (Actual)

December 1, 2012

Study Completion (Actual)

December 1, 2012

Study Registration Dates

First Submitted

January 3, 2016

First Submitted That Met QC Criteria

January 4, 2016

First Posted (Estimate)

January 5, 2016

Study Record Updates

Last Update Posted (Estimate)

January 5, 2016

Last Update Submitted That Met QC Criteria

January 4, 2016

Last Verified

January 1, 2016

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • REP 101

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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