有人担心FDA partial hold ARC-520,仅批准1mg的多剂实验,这个不应该是大问题。在美国以外,已经开始了>1mg的multi-dose实验,相信美国也会放开。人的实验有7组,第六组就已经是2x2mg的。第5组是单支4mg,和第6组2x2mg没有显著不同,所以就算多支4mg真的不批,2mg多支可以达到一样效果。
And…most have thought that NUCs did not effect cccDNA levels – Data has emerged this year from two sources showing large reductions in cccDNA levels with NUC therapy in humans – and now in Arrowhead chimps
Stephen Locarnini教授
并且。。。大多数认为核苷对cccDNA没作用-
数据显示在人核苷的治疗大幅减低cccDNA-现在在箭头的黑猩猩印证 作者: StephenW 时间: 2015-9-30 10:59
1855
Profound Reduction of HBV Covalently Closed Circular
DNA with Long-term Nucleoside/tide Analogue Therapy
Ching-Lung Lai 1,2
, Danny Wong 1,2
, Philip Ip 3
, Malgorzata Kopaniszen 1
, Wai-Kay Seto 1,2
, James Fung 1,2
, Fung-Yu Huang 1
, Brian P. Lee 4
, Giuseppe Cullaro 5
, Chi Hang Wu 1
, Charles Cheng 1
, Chi Hang J. Yuen 1
, Vincent Ngai 1
, Man-Fung Yuen 1,2;
1 Medicine, The University of Hong Kong, Hong Kong SAR, Hong Kong;
2 State Key Laboratory for Liver Research, The University of Hong Kong, Hong
Kong SAR, Hong Kong;
3 Pathology, The University of Hong Kong,
Hong Kong SAR, Hong Kong;
4Medicine, Johns Hopkins University
School of Medicine, Baltimore, MD;
5Medicine, Columbia College
of Physicians and Surgeons, New York City, NY
Background: Long-term nucleoside/tide analogue (NA) treatment suppresses serum HBV DNA to undetectable levels in a
majority of patients. We aimed to investigate the effect of long-
term NA on the suppression of covalently closed circular DNA
(cccDNA) and intrahepatic HBV DNA (ihHBV-DNA). Methods:
We recruited 40 patients (median age 44.2 years, range
24.3-63.2) who had been on continuous long-term (5 – 10 years) NA. All patients had 3 liver biopsies: at baseline, after
1 year of treatment and at the last follow-up. Serum HBV DNA
and HBsAg were measured by the COBAS TaqMan HBV Test
and the Elecsys HBsAg II Assay, respectively (both Roche Diagnostics). ihHBV-DNA and cccDNA were assayed by real-time
PCR, with lower limits of detection of 0.001 and 0.005 copies/cell, respectively. Results: The median duration of treatment
was 10.5 years (range: 6.0 – 11.9 years). At baseline, 13
patients had 100mg lamivudine, 11 had 600mg telbivudine,
9 had 0.5mg entecavir, 4 had 30mg clevudine, and 3 had
10mg adefovir. At the last follow up, these patients were on
0.5-1.0mg entecavir (n=23), 600mg telbivudine (n=9), 10mg
adefovir (n=4), 300mg tenofovir (n=2), or combination therapy
of lamivudine plus adefovir/tenofovir (n=2). Histology of the
third biopsy showed complete resolution of interface hepatitis
in 60% of patients with the remainder showing mild-to-moderate activity. Persistent immunoreactivity for HBsAg was found
in 80%, the mean number of hepatocytes positive for HBsAg
being 10.4% (range 1-80%). All but 1 (2.5%) was immunoreactive for HBcAg. At baseline, the median serum HBV DNA,
HBsAg, ihHBV-DNA and cccDNA levels were 6.84 logIU/mL, 3.38 logIU/mL, 286 copies/cell, and 7.3 copies/cell,
respectively. At the time of the last biopsies, 36 (90%) patients
had undetectable serum HBV DNA (<20 IU/mL), all but one
patient still had detectable HBsAg (median: 2.74 logIU/mL),
all had detectable ihHBV-DNA (median: 0.4 copies/cell), but
18 (45%) patients had undetectable cccDNA. There was a
trend of reduction of HBsAg, ihHBV-DNA and cccDNA levels
from baseline to 1 year to last follow-up (all p<0.0001). The
median log drop of HBsAg at last biopsy was 0.55 logIU/mL.
The median percentage reductions of HBsAg, ihHBV-DNA and
cccDNA at last biopsies were 71.46%, 99.85% and 99.89%,
respectively. Conclusions: Long-term NA treatment significantly
reduced cccDNA and ihDNA. 45% of patients had undetectable cccDNA, although small amount of ihHBV-DNA were still
detectable in all patients. Integrated HBV DNA may be a possible source of detectable ihHBV-DNA and HBsAg. Continuous
long-term NA therapy can reduce cccDNA to undetectable
levels, suggesting a possible end-point of treatment.
Disclosures:
Ching-Lung Lai - Advisory Committees or Review Panels: Bristol-Myers Squibb,
Gilead Sciences Inc; Consulting: Bristol-Myers Squibb, Gilead Sciences, Inc;
Speaking and Teaching: Bristol-Myers Squibb, Gilead Sciences, Inc
Wai-Kay Seto - Advisory Committees or Review Panels: Gilead Science; Speak
-
ing and Teaching: Gilead Science, Bristol-Myers Squibb
Man-Fung Yuen - Advisory Committees or Review Panels: GlaxoSmithKline,
Bristol-Myers Squibb, Pfizer, GlaxoSmithKline, Bristol-Myers Squibb, Pfizer,
GlaxoSmithKline, Bristol-Myers Squibb, Pfizer, GlaxoSmithKline, Bristol-Myers Squibb, Pfizer; Grant/Research Support: Roche, Bristol-Myers Squibb,
GlaxoSmithKline, Gilead Science, Roche, Bristol-Myers Squibb, GlaxoSmithKline, Gilead Science, Roche, Bristol-Myers Squibb, GlaxoSmithKline, Gilead
Science, Roche, Bristol-Myers Squibb, GlaxoSmithKline, Gilead Science
The following people have nothing to disclose: Danny Wong, Philip Ip, Malgorzata Kopaniszen, James Fung, Fung-Yu Huang, Brian P. Lee, Giuseppe Cullaro,
Chi Hang Wu, Charles Cheng, Chi Hang J. Yuen, Vincent Ngai 作者: StephenW 时间: 2015-9-30 11:06
In HBeAg-negative chimps predicted to have higher levels of integrated DNA, administration of the integrant-targeted siRNA in ARC-521 led to 99% (2 logs) of additional HBsAg reduction. The Company expects to file an IND or equivalent for ARC-521 by mid-2016.作者: ivanich 时间: 2015-9-30 16:10
有人担心FDA partial hold ARC-520,仅批准1mg的多剂实验,这个不应该是大问题。在美国以外,已经开始了>1mg的multi-dose实验,相信美国也会放开。人的实验有7组,第六组就已经是2x2mg的。第5组是单支4mg,和第6组2x2mg没有显著不同,所以就算多支4mg真的不批,2mg多支可以达到一样效果。
Reductions in cccDNA under NUC and ARC-520 therapy
in chimpanzees with chronic hepatitis B virus infection
implicate integrated DNA in maintaining circulating
HBsAg
Christine I. Wooddell1, Deborah Chavez2, Jason E. Goetzmann3,
Bernadette Guerra2, Ryan M. Peterson1, Helen Lee2,
Julia O. Hegge1, Robert Gish4, Stephen Locarnini5, Christopher
R. Anzalone1, Robert E. Lanford2, David L. Lewis1; 1Arrowhead
Madison, Arrowhead Research Corporation, Madison, WI; 2Texas
Biomedical Research Institute, San Antonio, TX; 3New Iberia
Research Center, University of Louisiana at Lafayette, New Iberia,
LA; 4Department of Medicine, Stanford University Medical Center,
San Diego, CA; 5Victorian Infectious Diseases Reference Laboratory,
Melbourne, VIC, Australia
Background: RNAi therapeutic ARC-520 designed to target
all cccDNA-derived transcripts reduces viral antigenemia for
>1 month after single doses in HBV patients. Here we report
the effect of multiple ARC-520 doses on hepatic HBV DNA
and RNA in HBV chimps. Methods: 9 chimps (5 M, 4 F; 9-37
yrs) received 6-11 monthly injections of ARC-520 concurrent
with NUC therapy. 5 were HBeAg-positive (HBeAg+), baseline
DNA 8-9 log10 IU/mL serum, and 4 were HBeAg-negative
(HBeAg-), ≤3 log10 IU/mL. Chimps received NUCs for
8-24 weeks prior to ARC-520 dosing. Liver biopsies from 8
chimps were taken at baseline, completion of NUC lead-in
and on study. HBV DNA, +/- plasmid-safe DNase digestion to
enrich cccDNA, was measured by qPCR. Pre-core/core RNA
(C probe) and total HBV RNA (Total probe) were measured
by RT-qPCR. The Guide for the Care and Use of Laboratory
Animals was strictly adhered to. Results: During NUC lead-in,
total liver HBV DNA decreased 1.1-2.5 log10 in HBeAg+ but
not appreciably in HBeAg- chimps. cccDNA in HBeAg+ chimps
decreased 0.7 ± 0.6 log10. Following addition of ARC-520 in
HBeAg+, total liver DNA decreased from baseline by 1.5–2.9
log10 and cccDNA by 1.4 ± 0.7 log10, the degree of reduction
generally correlating with duration of treatment. Neither
total HBV DNA nor cccDNA levels changed remarkably in
HBeAg- during the study, which at baseline had 2-4 orders of
magnitude less cccDNA than HBeAg+ chimps. HBeAg- chimps
had 50-fold more DNase-sensitive HBV DNA, possibly indicating
the majority is integrated DNA rather than cccDNA.
HBV RNA was not reduced by NUCs, but with addition of
ARC-520 RNA reductions tracked qHBsAg reductions. In
HBeAg+, Total probe detected 1-2x as many transcripts as
the C probe, suggesting similar levels of core/pre-core and
S transcripts. In HBeAg-, the Total probe detected 37x more
transcripts than the C probe, supporting a greater proportion of
HBsAg transcripts being produced from integrated HBV DNA
in HBeAg- chimps. Integration between DR1 and DR2 would
result in HBV RNA lacking ARC-520 target sites, consistent
with greater HBsAg reduction in HBeAg+ (1.7 ± 0.5 log10)
than HBeAg- chimps (0.7 ± 0.1 log10). Administration of siRNA
targeted to integrant-produced transcripts resulted in HBsAg
reductions up to 2.3 log10 beyond those produced by ARC-520
in HBeAg-. Conclusions: 1) ARC-520 reduced total liver DNA
and cccDNA beyond levels achieved in HBeAg+ with NUCs
during lead-in; 2) ARC-520 but not NUCs reduced HBV RNA
and antigens; 3) integrated HBV DNA may be important in
maintaining HBsAg in chronic HBV, especially in HBeAg-. This
finding, if confirmed, has important implications for development
of new HBV therapies.
Disclosures:
Christine I. Wooddell - Employment: Arrowhead Research Corporation
Ryan M. Peterson - Employment: Arrowhead Research Corporation
Julia O. Hegge - Employment: Arrowhead Research Corp
Robert Gish - Advisory Committees or Review Panels: Gilead, AbbVie, Arrowhead;
Consulting: Eiger, Isis, Genentech; Speaking and Teaching: Gilead, Abb-
Vie; Stock Shareholder: Arrowhead
Stephen Locarnini - Consulting: Gilead, Arrowhead; Employment: Melbourne
Health
Robert E. Lanford - Grant/Research Support: Arrowhead Research
David L. Lewis - Employment: Arrowhead Research Corporation
The following authors have nothing to disclose: Deborah Chavez, Jason E. Goetzmann,
Bernadette Guerra, Helen Lee, Christopher R. Anzal作者: zgct 时间: 2015-10-4 13:15
31
Update on the safety and efficacy of REP 2139 monotherapy
and subsequent combination therapy with
pegylated interferon alpha-2a in chronic HBV / HDV
co-infection in Caucasian patients
Michel Bazinet1, Victor Pantea2, Valentin Cebotarescu2, Lilia
Cojuhari3, Paulina Jimbei3, Jeffrey Albrecht4, Peter Schmid4, Hadi
Karimzadeh5, Michael Roggendorf5, Andrew Vaillant1; 1Replicor
Inc., Montreal, QC, Canada; 2N. Testemitanu State University of
Medicine and Pharmacy, Chisinau, Moldova (the Republic of);
3Toma Ciorba Infectious Clinical Hospital, Chisinau, Moldova
(the Republic of); 4National Genetics Institute, Los Angeles, CA;
5Institure of Virololgy, Technische Universität München, Munich,
Germany
Introduction: HBV / HDV co-infection causes rapid progression
of liver disease and with no approved therapy, presents a
significant unmet medical need. Nucleic acid polymers (NAPs)
block HBV subviral particle assembly and release from infected
hepatocytes and can eliminate serum HBsAg. As the NAP REP
2139 was previously been shown to clear serum HBsAg and
improve the ability of immunotherapy to elicit SVR in Asian
patients with HBV, its activity in combination with Pegasys® in
HBV / HDV co-infected Caucasian patients is currently being
examined. Methods: In a phase II proof of concept trial (REP
301; NCT02233075), patients with chronic HBV / HDV co-infection
received once weekly dosing of 500mg REP 2139-Ca
(calcium chelate complex) by 2h IV infusion for 15 weeks,
followed by 15 weeks of combined therapy with 250mg REP
2139-Ca and 180ug Pegasys® and then 33 weeks with
Pegasys® monotherapy. Viremia (HDV RNA and HBV DNA),
HBsAg and anti-HBs are followed every two weeks (Robogene
RT-PCR, Abbott RealTime HBV, Abbott Architect) performed at
the Institute of Virology, University of Duisburg-Essen (Essen,
Germany). HDV RNA is validated on separate test platforms
at the National Genetics Institute (Los Angeles, USA) and the
Institute of Virology, Technische Universität München (Munich,
Germany). Results: REP 2139-Ca treatment is well tolerated
with mild and quickly resolving IV infusion reactions. Serum
HBsAg is currently reduced 1-6 log in 11/12 patients (5 with
serum HBsAg < 1 IU / ml) and HDV RNA is currently reduced
1.5-7 log in 12 /12 patients (undetectable in 6 patients). Anti-
HBs is detected in 10/12 patients, with 6 patients < 10mIU /
ml and after combined exposure to Pegasys®, 5 patients have
substantially increased anti-HBs titers from 50 to > 800 mIU /
ml. In all patients with pre-treatment HBV DNA < 10 IU / ml,
de-repression of serum HBV DNA is observed. Conclusions:
Updated interim data from the REP 301 protocol assessing the
safety and antiviral efficacy of REP 2139 (first in monotherapy
and then with add on Pegasys® at week 16) in 12 Caucasian
patients with chronic HBV / HDV co-infection demonstrated
substantial reductions in serum HBsAg and HDV RNA as well
as appearance of anti-HBs. HDV RNA reductions appear stronger
than HBsAg reductions, suggesting an additional antiviral
mechanism other than the inhibition of subviral particle assembly
may affect HDV directly. REP 2139-Ca may become an
important new therapeutic option for patients with chronic HBV
/ HDV infection.
Disclosures:
Michel Bazinet - Board Membership: REPLICor Inc.; Employment: REPLICor Inc.;
Management Position: REPLICor Inc.; Patent Held/Filed: REPLICor Inc.; Stock
Shareholder: REPLICor Inc.
Andrew Vaillant - Employment: REPLICor; Stock Shareholder: REPLICor
The following authors have nothing to disclose: Victor Pantea, Valentin
Cebotarescu, Lilia Cojuhari, Paulina Jimbei, Jeffrey Albrecht, Peter Schmid, Hadi
Karimzadeh, Michael Roggendorf
楼主科普下这药靠谱吗作者: HBVcheck 时间: 2015-10-5 19:54
Oct 5, 2015
Previous Release PDF Add to Briefcase
Arrowhead to Present at Upcoming Conferences
PASADENA, Calif.--(BUSINESS WIRE)-- Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical company developing targeted RNAi therapeutics, today announced that the company will present at the following upcoming conferences.
Partnerships in Drug Delivery - Boston, October 5-6, 2015
October 6, 2:45 p.m. EDT - David Rozema, Ph.D., vice president, chemistry will participate in a panel discussion titled, "Can RNA-based therapeutics really deliver?"
2015 International Meeting on Molecular Biology of Hepatitis B - Dolce Bad Nauheim, Germany, October 4-8, 2015
October 7, 5:00-7:00 p.m. CET - Christine Wooddell, Ph.D., group leader will deliver a poster presentation titled, "Integrated HBV DNA significantly contributes to serum HBsAg levels in chronically infected chimpanzees"
11th Annual Meeting of the Oligonucleotide Therapeutics Society - Leiden, the Netherlands, October 11-14, 2015
October 14, 3:30 p.m. CET - Bruce Given, M.D., chief operating officer will deliver an oral presentation titled, "Development of RNAi-based therapeutics using DPC™ technology"
The Liver Meeting 2015®, 66th Annual Meeting of the American Association for the Study of Liver Disease (AASLD) - San Francisco, November 13-17, 2015
November 15, 3:15 p.m. PST - Christine Wooddell, Ph.D., group leader will deliver an oral presentation titled, "Reductions in cccDNA under NUC and ARC-520 therapy in chimpanzees with chronic hepatitis B virus infection implicate integrated DNA in maintaining circulating HBsAg"
November 17, 8:00 a.m. - 12:00 p.m. PST - Christine Wooddell, Ph.D., group leader will deliver a poster presentation titled, "Monthly dosing of ARC-520 in chronically hepatitis B virus infected chimpanzees produces rapid, deep and durable reductions in circulating viral antigens"
A copy of presentation materials, if available, can be accessed by visiting the Events section of the company's website at http://ir.arrowheadresearch.com/events.cfm after the presentations conclude.作者: 齐欢畅2 时间: 2015-10-5 23:50
至于为什么520只针对cccDNA,在这之前所有的人都在说cccDNA难以消除,这就是为什么研究针对cccDNA的抑制。直到9月24的发布, 告诉你integrated DNA也在生产HBsAG. 而不是看到一句话就HIGH了
.
9月24的发布前, integrated DNA THAT INCLUDES S-GENES 能够生产HBsAG 是一个众所周知的事实! 没什么新的. 箭头知道,Locarnini教授知道. 但integrated DNA生产的HBsAG数量被假定为低.
乙肝e抗原阴性患者有很多可以产生HBsAg整合的DNA还没有得到证实!作者: disan 时间: 2015-10-6 06:20
SW, this is from what you posted for TKM-HBV. It may or may not answer you questions, but that's it from me.
"Because it
prevents the synthesis of viral proteins and reduces the overall
antigen load in the body, this mode of drug action may
present advantages over other approaches that seek to block
viral protein secretion into the bloodstream thereby potentially
causing intracellular build-up and ER stress."
with all respect to you, you better summary all the new drugs not me, and I do hope you understand what you saying...
http://hepbblog.org/2014/05/13/alnylam-discloses-hbv-program-shows-2-log-hbsag-knockdown-with-research-grade-snalp-tech/
For ARC520, especially at 2mg/kg and Tekmira probably just 6 months behind, the competition may prove too much, not least because in the 2-dose study in the chimpanzee, the HBsAg knockdown was less than a log (80%). Granted it was an extremely viremic chimp and one of the RNAi triggers was a mismatch, but still.
RNAi is used to target foreign genes. FDA is cautious because RNAi may accidentally silence a human gene, that is one of the reasons why FDA wants to proceed slowly.
The warning against REP9AC is equally valid( potentially causing intracellular build-up and ER stress).
For both ARC520 and REP9AC, we can only take their words that their treatments are "safe and well tolerated".
If you read the ARC520 presentation carefully(slide 34), hbvdna intergration does not mean the integration of complete cccDNA into the human genome, only fragments of the cccDNA are intergrated, for example, part or whole of S genes, X gene, and C gene. So, intergrated hbvdna cannot be used as a template to replicate a new HBV virion.
" Granted it was an extremely viremic chimp and one of the RNAi triggers was a mismatch, but still." - This means one of the RNAi triggers was a mismatch against HBV cccDNA, in chimp or human! As I say before, RNAi triggers should be designed against viral antigens' genes only! ARC520 presentation also gives you their reason(Slide 37, Loss of ARC-520 target sites explains lower KD of HBsAg in HBeAg neg chimps) why ARC520 does not work if part of cccDNA is lost during integration - nothing to do with the chimp's DNA.
1)从ABUS官方网站
One of the 3 target sites is located within the surface antigen coding region, allowing TKM-HBV to silence sAg regardless of wheth-er it is expressed from cccDNA or from HBV genome fragments that have been integrated into host chromosomes.