[p=23, null, center]Replicor updates mechanistic and clinical data demonstrating high rates of functional control of HBV and HDV infection at The Science of HBV Cure 2018
[p=23, null, left]MONTREAL, June 11, 2018 – Replicor Inc., a privately held biopharmaceutical company targeting a cure for patients with chronic hepatitis B virus (HBV) and chronic HBV and hepatitis delta virus (HDV) co-infection, presented updated mechanistic and clinical data last week at the Science of HBV Cure workshop, a part of the Singapore Hepatology Conference, held June 8-9, 2018 in Singapore. Updated mechanistic data and pre-clinical data on the antiviral effects of REP 2139 in monotherapy were discussed on June 8, followed by a second presentation on June 9 focusing on functional control rates achieved with REP 2139-based combination therapy in HBV and HDV infections.
[p=23, null, left]REP 2139’s antiviral effects against HBV infection include not only blocking the assembly and release of subviral particles but reductions in intracellular HBsAg which are accompanied by inhibition of viral replication in the liver early during treatment in pre-clinical studies. Dr. Andrew Vaillant, CSO, commented “the new awareness that REP 2139 might actually lead to lower intrahepatic HBsAg may suggest immediate improvement in intrahepatic immune function which could begin to explain the other antiviral effects which accompany REP 2139 monotherapy including reduction in viral replication in the liver, the onset of therapeutic transaminase flares and reductions of serum HBV DNA”.
[p=23, null, left]An overview of trials using REP 2139-based combination regimens with different immunotherapies and TDF demonstrated the profound benefit HBsAg clearance has on the ability of immunotherapy to achieve functional control in HBV and HDV infections, indicating that substantial reductions of HBsAg will clearly be necessary for any immunotherapy to be functional against HBV infection. Dr. Vaillant went on to comment, “TDF sets a high bar for other direct acting antiviral agents to follow, with demonstrated immunotherapeutic properties in addition to its ability to suppress serum HBV DNA, and a demonstrated ability to reduce cccDNA in the liver. The high rates of functional control we currently see in the REP 401 protocol are likely due at least in part to the bifunctional nature of TDF”. Current functional control rates in patients completing 24 weeks of follow-up in the REP 401 protocol are 87% (HBV DNA < 1000 IU/mL) and 70% (HBV DNA < LLOQ) with HBsAg ≤ LLOQ in 53% of patients.
[p=23, null, left]Replicor’s presentations from Science of HBV Cure meeting are now available at www.replicor.com/science/conference-presentations. 作者: StephenW 时间: 2018-6-11 22:13
使用基于REP 2139的联合方案与不同免疫疗法和TDF的试验综述表明,HBsAg清除对免疫治疗实现HBV和HDV感染功能控制的能力具有深远的益处,表明HBsAg的显着减少对于任何免疫疗法对HBV感染有功能。 Vaillant博士继续评论道:“TDF为其他直接作用抗病毒药物的应用设定了一个高标准,除了抑制血清HBV DNA的能力外,还具有明显的免疫治疗特性,并且具有减少肝脏cccDNA的能力。我们目前在REP 401协议中看到的功能控制率很高,可能至少部分是由于TDF的双功能特性造成的“。目前在REP 401方案中完成24周随访的患者的功能控制率在53%的患者中为87%(HBV DNA <1000 IU / mL)和70%(HBV DNA <LLOQ),HBsAg≤LLOQ。
改善替诺福韦前药的肝脏分配可能会增加替诺福韦在肝脏中的治疗效果:
TXL >> TAF> TDF
随着HBsAg的减少,这些免疫治疗效果可能变得显着
New finding:
Adenosine based NUCs (ADV and TDF) efficiently inhibit the HBV RT
but all are also bifunctional agents with immunotherapeutic properties
•bind to the purine P1 receptor
•activate the production of various cytokines including TNFα and INFγ
•stimulate the production of INFλ in patients also have a direct effect on reducing
cccDNA levels in the liver
Improved liver partitioning of tenofovir pro-drugs may increase the mmunotherapeutic effects of tenofovir in the liver:
TXL >> TAF > TDF
These immunotherapeutic effects may become significant with reduction of HBsAg作者: hp121 时间: 2018-6-12 00:17