10th Annual Meeting of the Oligonucleotide Therapeutics Society
Session 10: Preclinical/Clinical III
Andrew Vaillant
Wednesday, October 15, 2014 4:30PM-4:45PM
Nucleic Acid Polymers for the Treatment of Chronic HBV:A new therapeutic alternative.
Andrew Vaillant
REPLICor Inc., Montreal, Canada
The hepatitis B surface antigen (HBsAg) is an immuno-inhibitory protein released from infected hepatocytes and the abundant circulating levels of this protein play a key role in the chronic suppression of the immune response and maintenance of HBV infection. Nucleic acid polymers (NAPs) use the sequence independent and size dependent properties of phosphorothioate oligonucleotides to target amphipathic interactions critical for the release of hepatitis B surface antigen from infected hepatocytes. Unlike antisense or siRNA strategies which target viral sequences, the interaction between NAPs and their target is insensitive to viral mutation. NAPs naturally accumulate in the liver and can be further optimized to remove immunostimulatory, hybridization and aptameric off target effects. The use of two such optimized NAPs (REP 2055 and REP 2139) in human patients are well tolerated and reliably remove circulating HBsAg (up to 5 log reductions) to undetectable levels in patients, resulting in the appearance of anti-HBsAg antibodies, elimination of HBeAg, the appearance of anti-HBeAg antibodies and 3–9 log reductions in viral titers. Despite the complete removal of HBsAg and HBeAg for several months, only 25% of patients achieved SVR off treatment (HBV DNA < 20 copies / ml). Combination therapy with NAPs and immunotherapy was well tolerated and improved the speed of the antiviral response and lead to 89% of patients achieving SVR off treatment. These results demonstrate that prolonged elimination of viral antigens is insufficient to elicit SVR in most patients with chronic HBV infection and that concomitant immunotherapy is required to re-establish immune control in the absence of viral antigens in most patients. NAPs represent an alternative application of oligonucleotide chemistry which will provide an important new advance for HBV therapy.
Andrew Vaillant, Ph.D.
Chief Scientific Officer
REPLICor Inc.
6100 Royalmount Avenue
Montreal, Quebec H4P 2R2
Canada [email protected]
REPLICor to present updated clinical trial data with combination treatment using its HBsAg-release inhibitors in patients with chronic hepatitis B infection at the 10th Annual Meeting of the Oligonucleotide Therapeutics Society. Montreal, Quebec – October 7, 2014 – Updated clinical trial data from REPLICor’s three Asian trials using its nucleic acid polymer (NAP) HBsAg-release inhibitors REP 2055 (REP 9AC) and REP 2139 (REP 9AC’) will be presented at the 10th Annual Meeting of the Oligonucleotide Therapeutics Society (OTS), to be held from Oct 12-16, 2014 in San Diego, CA.
REPLICor has currently tested its HBsAg-release inhibitor technology in three different clinical trials using different treatment modalities: in monotherapy, in combination with short term immunotherapy and in combination with a complete course of Pegasys™. Data presented by REPLCor during its presentation at the OTS meeting on Oct 15th will demonstrate 1) the unique ability of REPLICor’s NAP compounds to completely suppress HBsAg in the blood 2) the effect of HBsAg clearance on dramatically improving the activity of immunotherapy and 3) when used with a full course of Pegasys™, NAP therapy has resulted in the establishment of long term SVR in 80% of patients.
Link to the 2014 OTS meeting: http://www.cvent.com/events/10th-annual-meeting-of-the-oligonucleotide-therapeutics-society/event-summary-a61fb28b01f84906845f05a247fcfb9b.aspx
“when used with a full course of Pegasys™, NAP therapy has resulted in the establishment of long term SVR in 80% of patients.“
就是说打48针派+REP9AC,可有80%的患者有一个长期的DNA抑制?
这个“长期”是3年,5年?(估计没有这么长的时间数据)
看来。。。 作者: StephenW 时间: 2014-10-8 16:01
绝对治愈(Absolute cure) - 从肝病死亡风险如从来没有被感染的人一样.Risk of death from
liver disease: Same as person who was never infected.
功能性治愈(Functional cure) - 从肝病死亡风险如自然解决了感染的人一样.Risk of death from
liver disease:Same as person with naturally resolved infection.