Abbott Presents Positive Results from Interferon-Free Phase 2 "Co-Pilot" Study for the Treatment of Hepatitis C
More than 90 Percent of Patients New to HCV Treatment Achieved Sustained Viral Response through 12 Weeks
April 19, 2012 - ABBOTT PARK, Ill., and WATERTOWN, Mass., - Abbott and
Enanta Pharmaceuticals announced data from "Co-Pilot," an interferon-free, Phase 2 study of Abbott's direct-acting antiviral medicines for the
treatment of hepatitis C (HCV) that found that more than 90 percent of patients new to HCV treatment achieved sustained viral response
through 12 weeks (SVR12). Results were released today at a press conference at the International Liver Congress 2012 (ILC 2012),
the annual meeting of the European Association for the Study of the Liver (EASL), in Barcelona, Spain, and will also be
presented in an oral platform presentation at the latebreaking trials session on Saturday, April 21.
In a three-arm study known as "Co-Pilot," different doses of ABT-450/r, plus ABT-333 and ribavirin administered for 12 weeks
showed sustained virological response at 12-weeks post treatment (SVR12) in 95 percent and 93 percent of treatment-naive genotype 1
(GT1) patients, with no post-treatment relapses. In these patients, response was independent of HCV subtype, host IL28B genotype
or dose of ABT-450/r.
In addition, SVR12 was achieved in 47 percent of patients who were previous non-responders to past HCV treatment.
"As we get our first look at longer term response data for interferon-free regimens for the treatment of HCV, we remain
extremely encouraged by the levels of sustained response we are seeing in patients new to treatment and in patients who had failed
prior treatment," said Fred Poordad, M.D., chief of hepatology at Cedars-Sinai Medical Center in Los Angeles, and the lead
investigator for Co-Pilot. "We are seeing this level of sustained response with only 12 weeks of therapy, supporting
the goal of introducing an interferon-free, all-oral regimen of direct-acting antiviral medications as an important
new treatment option for HCV."
Current treatments for HCV remain interferon-based. A significant number of HCV patients are unable or unwilling to take
interferon due to contraindications and/or some of the most commonly reported side effects, which may include flu-like symptoms,
depression and insomnia. Specifically targeted antiviral therapies for HCV, such as protease inhibitors and non-nucleoside
polymerase inhibitors, may have the potential to increase the proportion of patients in whom the virus can be eradicated.
Key Findings - Arm 1 in Treatment-Naive Patients
- ABT-450/r 250/100 mg dosed once daily (QD) + ABT-333 400 mg dosed twice daily (BID) + ribavirin in treatment-naive
patients infected with HCV GT1
- 95 percent (18 of 19) achieved SVR12
- There were no post-treatment relapses in these patients
- One patient discontinued due to asymptomatic isolated ALT/AST elevations at week 2
- HCV Genotype breakdown: 17 GT 1a, 2 GT 1b
- IL28 Genotype breakdown: 10 C/C, 7 C/T, 2 T/T
Key Findings - Arm 2, Treatment-Naive Patients
- ABT-450/r 150/100 mg QD + ABT-333 400 mg BID + ribavirin in treatment-naive patients infected with HCV GT1
- 93 percent (13 of 14) of patients achieved SVR12
- There were no post-treatment relapses in these patients
- One patient discontinued due to noncompliance in week 1
- HCV Genotype breakdown: 11 GT 1a, 3 GT 1b
- IL28 Genotype breakdown: 5 C/C, 7 C/T, 2 T/T
Key Findings - Arm 3, prior non-responders
- ABT-450/r 150/100 mg QD + ABT-333 400 mg BID + ribavirin in patients who had previously not responded to other HCV
- 47 percent (8 of 17) patients achieved SVR12
- HCV Genotype breakdown: 16 GT 1a, 1 GT 1b
- IL28 Genotype breakdown: 0 C/C, 12 C/T (50% achieved SVR12), 5 T/T (40% achieved SVR12)
- Six patients experienced viral breakthrough while on treatment and three patients relapsed after treatment stopped
- Prior non-responders included null responders (patients who failed to achieve 2 log reduction by week 12 while taking peg-interferon and ribavirin) and partial responders (patients who failed to achieve HCV RNA below the limit of detection during treatment with peg-interferon and ribavirin); the response rate was similar in both populations
- Null responder subgroup (6 patients): 50% of patients achieved SVR12
- Partial responder subgroup (11 patients): 45% achieved SVR12
In the trial, the most common adverse events reported in subjects receiving ABT-450/r in combination with pegIFN/RBV were headache, fatigue,
insomnia and depression. A similar proportion of subjects reported at least one adverse event in all treatment groups, including
"Co-Pilot was an exploratory study that demonstrates the potential to cure a large percentage of treatment-naive genotype 1 patients with two of our direct-acting antiviral medicines,
and no peg-interferon, in a short, 12-week course of treatment," said Scott Brun, M.D., divisional vice president, Infectious Disease
Development, Abbott. "We continue to research a variety of combination regimens with additional agents, including our NS5A inhibitor,
with the potential to improve outcomes in patients who have failed prior treatments and look forward to presenting those results
in the future."
About Study M12-746 (Co-Pilot)
- The objectives of this Phase 2 study were to assess safety and tolerability of 12-week, interferon-free regimens in HCV GT1 patients
who were either treatment-naive or previous non-responders. The trial had three arms with three primary endpoints - rapid virological
response (RVR) at week 4 and SVR at weeks 4 and 12.
- Enrollment was open to GT1-infected patients regardless of IL28B host genotype and ribavirin dosing was weight-based.
ABT-450 is being developed with low dose ritonavir which enhances the pharmacokinetic properties of ABT-450. The use of
ritonavir 100 mg with ABT-450 for the treatment of HCV is investigational.
ABT-450 was discovered during the course of collaboration between Abbott and Enanta Pharmaceuticals for protease
inhibitors. ABT-450 is being developed by Abbott for use in combination with Abbott's non-nucleoside polymerase inhibitors (ABT-333 and
ABT-072) and NS5A inhibitor (ABT-267). ;Additional data from larger, ongoing Phase 2 clinical trials is expected later this year.
About the Hepatitis C Virus
Hepatitis C is a liver disease affecting as many as 170 million people worldwide. The virus is primarily spread through direct contact
with the blood of an infected person. HCV increases a person's risk of developing chronic liver disease, cirrhosis, liver cancer and death;
and liver disease associated with HCV infection is growing rapidly.
Ritonavir is in a class of medicines called the HIV protease inhibitors. Ritonavir is used in combination with other anti-HIV
medicines to treat people with human immunodeficiency virus (HIV) infection. Ritonavir is for adults and for children greater than 1 month
in age and older.
Ritonavir does not cure HIV infection or AIDS and does not reduce the risk of passing HIV to others. People taking
ritonavir may still get opportunistic infections or other conditions that happen with HIV infection. Some of these conditions are
pneumonia, herpes virus infections, and Mycobacterium avium complex (MAC) infections.
Ritonavir Safety in Treatment of HIV
Patients should not take ritonavir with certain medicines, as these can cause serious or life-threatening
problems such as irregular heartbeat, breathing difficulties, or excessive sleepiness. Patients should not take
ritonavir if they have had a serious allergic reaction to any of its ingredients. Some patients taking ritonavir may
develop liver and pancreas problems, which can cause death.
Patients may develop large increases in triglycerides and cholesterol, diabetes, high blood sugar, changes in body fat,
increased bleeding in people with hemophilia, allergic reactions, and/or changes in heart rhythm. Patients may develop signs and
symptoms of infections that they already have after starting anti-HIV medicines.
For more information, please see the Important Safety Information and full Prescribing Information for ritonavir.
Enanta Pharmaceuticals is a research and development company that uses its novel chemistry approach and drug discovery capabilities
to create best in class small molecule drugs in the infectious disease field. Enanta is developing novel protease, NS5A,
nucleoside(tide) polymerase, and cyclophilin-based inhibitors targeted against the Hepatitis C virus (HCV). Additionally,
the Company has created a new class of macrolide antibiotics, called Bicyclolides, which overcomes bacterial resistance.
Antibacterial focus areas include superbugs, respiratory tract infections, and intravenous and oral treatments for
hospital and community MRSA. Enanta is a privately held company headquartered in Watertown, Mass. Enanta's
news releases and other information are available on the company's web site at www.enanta.com .
About Abbott's HCV Develpment Programs
Abbott's HCV development programs include its partnership with Enanta Pharmaceuticals to discover protease inhibitors, as well as internal
programs focused on additional viral targets, including polymerase inhibitors. Abbott currently has four HCV compounds in phase
2 clinical trials, including a protease inhibitor, two polymerase inhibitors and an NS5A inhibitor. Abbott is well positioned to
explore combinations of these compounds, a strategy with the potential to markedly transform current treatment practices.
Abbott is a global, broad-based health care company devoted to the discovery, development, manufacturing and marketing of pharmaceuticals
and medical products, including nutritionals, devices and diagnostics. The company employs nearly 90,000 people and markets its products
in more than 130 countries.
"Reproduced with permission - Abbott "