REP 2139-Ca / Pegasys™ Combination Therapy in Hepatitis B / Hepatitis D Co-infection
REP 2139-Ca is nucleic acid polymer. Nucleic acid polymers have been previously shown to clear serum hepatitis B virus surface antigen (HBsAg) both preclinically (in duck HBV infected ducks) and in human patients and to act synergistically with immunotherapeutic agents such as pegylated interferon-alpha 2a or thymosin alpha-1 to restore host immunological control of HBV infection.
HBsAg is an essential component of the hepatitis D virus (HDV), therefore the direct action of REP 2139-Ca in removing serum HBsAg and its synergistic effect with pegylated interferon-alpha 2a is expected to have a significant antiviral effect against HDV infection.
This study will examine the safety and efficacy of REP 2139-Ca therapy when used in combination with pegylated interferon alpha-2a in patients with HBV / HDV co-infection.
The primary hypothesis to be tested is that this combined dosing regimen is safe and well tolerated in patients with HBV / HDV co-infection which will be assessed by examining the number of patients with adverse events (including reported symptoms and laboratory abnormalities).
The secondary hypothesis to be tested is that this combined dosing regimen will have an antiviral effect against HBV / HDV co-infection in these patients which will be assessed by examining the following outcomes:
- The number of patients with reductions in serum HBsAg.
- The number of patients with reductions in serum HDAg and HDV RNA
- The number of patients that experience a sustained antiviral response after treatment is stopped (reductions in serum HBV DNA and HDV RNA).
The secondary hypothesis to be tested is that this combination approach can have an effective
|Chronic HBV Infection (HBeAg Negative)||Drug: REP 2139-Ca + Pegasys (TM)||Phase 2|
|Study Design:||Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Treatment
|Official Title:||A Study of the Safety and Efficacy of Combination Treatment With REP 2139-Ca and Pegasys™ in Patients With Hepatitis B / Hepatitis D Co-infection|
- Number of patients experiencing a treatment-related adverse event. [ Time Frame: Every week for 63 weeks. ]Will examine the hypothesis that combined REP 2139-Ca / Pegasys(TM) treatment is safe and well tolerated in patients with HBV / HDV co-infection
- Number of patients with reduction of serum HBsAg. [ Time Frame: Every two weeks for 63 weeks (treatment duration) + 24 weeks (follow-up) ]Will examine the hypothesis that combination treatment with REP 2139-Ca / Pegasys(TM) will have an antiviral effect in patients with HBV / HDV co-infection.
- Number of patients with reduced serum HDV antigen / HDV RNA [ Time Frame: Every two weeks for 63 weeks (treatment duration) + 24 weeks followup ]Will examine the hypothesis that combination treatment with REP 2139-Ca / Pegasys(TM) will have an antiviral effect in patients with HBV / HDV co-infection.
- Number of patients with controlled HBV / HDV infection following treatment [ Time Frame: 24 weeks follow up (after completion of 63 weeks of treatment) ]Will examine the hypothesis that combination treatment with REP 2139-Ca / Pegasys(TM) will have an antiviral effect in patients with HBV / HDV co-infection.
|Study Start Date:||September 2014|
|Estimated Study Completion Date:||April 2017|
|Primary Completion Date:||November 2016 (Final data collection date for primary outcome measure)|
Experimental: REP 2139-Ca + Pegasys (TM)
REP 2139-Ca 500 mg QW for 15 weeks followed by REP 2139-Ca 250mg QW + Pegasys(TM) 180ug QW for 15 weeks followed by Pegasys(TM) 180ug QW for 33 weeks.
Drug: REP 2139-Ca + Pegasys (TM)
15 weeks of REP 2139-Ca (500mg QW IV) followed by: 15 weeks of REP 2139-Ca (250mg QW IV) + Pegasys(TM) (180 ug QW SC) followed by: 33 weeks of Pegasys(TM) (180 ug QW SC)
Other Name: Pegasys(TM) = pegylated interferon alpha-2a
Nucleic acid polymers (NAPs) utilize the sequence independent properties of phosphorothioated oligonucleotides to target apolipoprotein interactions involved in the formation of HBV subviral particles (SVPs) which are comprised mainly of the hepatitis B surface antigen protein (HBsAg). The effect of NAPs is to block the formation of SVPs inside infected hepatocytes which prevents their secretion. As SVPs account for > 99.99% of HBsAg in the blood, NAPs are an effective approach for clearing HBsAg from the serum of HBV infected patient.
Previous clinical trials have demonstrated that treatment with the NAP REP 2139 results in the rapid and effective clearance of HBsAg from the blood. This HBsAg removal has the immediate effect of unmasking the underlying, pre-existing anti-HBsAg (anti-HBs) response, allowing clearance of HBV virus from the blood.
HBsAg has important immunosuppressive effects in HBV infection which have been shown to block both adaptive and innate immune processes. Removal of HBsAg from the blood of patients removes this immunosuppressive effect.
Thus, an important additional effect of removal of HBsAg from the blood is to greatly enhance the effect of immunotherapeutic agents like pegylated interferon alpha-2a or thymosin alpha-1 to stimulate recovery of complete immune control of HBV infection.
HDV superinfection can only occur in patients with HBV infection because HDV requires the HBsAg protein for its assembly. Therefore, it is expected that the removal of serum HBsAg (from HBV SVPs) and unmasking of the anticipated, pre-existing anti-HBsAg response by REP 2139 will result in the clearance of HBV and HDV from the blood. Furthermore, the enhanced effect of immunotherapy in the absence of serum HBsAg has the potential to provide a durable control of both HBV and HDV infection that will persist after treatment.
Please refer to this study by its ClinicalTrials.gov identifier: NCT02233075
|Moldova, Republic of|
|Infectious Clinical Hospital ( n.a. Toma Ciorba)|
|Chisinau, Moldova, Republic of, 2004|
|Principal Investigator:||Victor Pantea, MD||Infectious Diseases Department, State University of Medicine and Pharmacy|