Gilead Announces 100 Percent Sustained Virologic Response Rate (SVR4) for an Interferon-Free Regimen of Sofosbuvir (GS-7977), GS-5885 and Ribavirin in Treatment-Na ïve Genotype 1 Hepatitis C Infected Patients
- Phase 3 Study with a Fixed-Dose Combination Tablet of Sofosbuvir and GS-5885 Now Underway
Nov. 10, 2012--
“These results indicate that adding GS-5885 to sofosbuvir-based regimens may enhance SVR rates, potentially offering HCV genotype 1 infected patients a convenient 12-week course of oral therapy,” said Professor
Gilead recently initiated the first Phase 3 trial (ION-I) evaluating a fixed-dose combination of sofosbuvir and GS-5885 in treatment-naïve genotype 1 patients. This four-arm study is evaluating the fixed-dose combination with and without ribavirin for 12-and 24-week durations in 800 patients, 20 percent of whom have evidence of cirrhosis.
Data from five additional arms of the ELECTRON study examining sofosbuvir-based therapy in various patient populations also will be presented:
| Treatment | Population | Results | ||||
| Sofosbuvir + ribavirin for 12 weeks | GT 1 treatment-naïve | 84% (21/25) SVR12 | ||||
| GT 1 null responders | 10% (1/10) SVR12 | |||||
| GT 2/3 treatment-experienced | 68% (17/25) SVR12 | |||||
| Sofosbuvir + ribavirin for 8 weeks | GT 2/3 treatment-naïve | 64% (16/25) SVR12 | ||||
| Sofosbuvir + ribavirin (800 mg) for 12 weeks | GT 2/3 treatment-naïve | 60% (6/10) SVR8 | ||||
Preliminary data from a subset of an ongoing cohort in the ELECTRON study in which nine genotype 1 previous null responders were treated with sofosbuvir, GS-5885 and ribavirin for 12 weeks also will be presented on Tuesday. Thus far, three of the nine patients have reached the four-week post-treatment time point and all three remain HCV negative.
Both sofosbuvir in combination with ribavirin and sofosbuvir in combination with GS-5885 and ribavirin were well tolerated in the ELECTRON study. In the sofosbuvir combined with GS-5885 and ribavirin groups, there was one discontinuation due to an adverse event unrelated to study drugs. Despite stopping therapy at week 8, this patient also achieved SVR4.
The most common adverse events were headache, fatigue, upper respiratory tract infection and nausea. The most common clinically significant grade 3/4 laboratory abnormality was a hemoglobin reduction.
Additional Safety Data for GS-5885
In a poster presentation at The Liver Meeting on
Researchers concluded that GS-5885 is safe and well tolerated. No laboratory abnormalities or other safety signal of concern has been observed in the GS-5885 development program.
Sofosbuvir and GS-5885 are investigational products and their safety and efficacy have not yet been established.
About
Forward-Looking Statement
This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks, uncertainties and other factors, including the possibility that the proportion of patients who maintain a sustained virologic response 12 weeks post-treatment will not be as favorable as the sustained virologic response rates reported in this press release, the possibility that results from the arm of the ELECTRON study evaluating the efficacy and safety of sofosbuvir, GS-5885 and ribavirin in genotype 1 previous null responder patients will not be favorable once four and 12 week post-treatment data from all nine patients are available and the possibility of unfavorable results from additional arms of the ELECTRON study and subsequent clinical trials involving sofosbuvir and GS-5885 with and without ribavirin. As a result, sofosbuvir and GS-5885 as single agents or as a fixed-dose combination may never be successfully commercialized. Further, Gilead may make a strategic decision to discontinue development of the compounds or the fixed-dose combination regimen if, for example, Gilead believes commercialization will be difficult relative to other opportunities in its pipeline. These risks, uncertainties and other factors could cause actual results to differ materially from those referred to in the forward-looking statements. The reader is cautioned not to rely on these forward-looking statements. These and other risks are described in detail in Gilead’s Annual Report on Form 10-K for the quarter ended
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November 12Gilead Climbs on Study Results of Hepatitis C Combo
November 10
Abbott, Gilead impress with upbeat results for oral hep C drugs
Gilead posts positive results in mid-stage Hepatitis C study
(Reuters) - Gilead Sciences Inc on Saturday reported a 100 percent cure rate using a combination of drugs in a small number of patients with the most common and hardest to treat form of hepatitis C.
Rival Abbott Laboratories Inc, meanwhile, said a trio of its oral medicines to treat hepatitis C produced unprecedented cure rates in a larger number of patients who had failed to benefit from standard treatment, as well as very high cure rates for newly treated patients.
Data from both companies' mid-stage trials were released Saturday at the annual meeting of the American Association for the Study of Liver Disease in Boston.
Gilead's study, dubbed Electron, examined 25 patients with genotype 1 chronic hepatitis C virus (HCV) infection who were treated for 12 weeks with a combination of three drugs: sofosbuvir, ribavirin and GS-5885.
GS-5885 is from a promising new class of drugs known as NS5A inhibitors, which prevent the hepatitis C virus from replicating.
The infection was undetectable four weeks after completing therapy in all of the patients who had never received this combination of drugs before, Gilead said.
The drugs generally were well tolerated in the study, Gilead said.
In the sofosbuvir combined with GS-5885 and ribavirin patient groups, one patient dropped out because of an adverse side effect that the company said was unrelated to the drugs.
Sofosbuvir and GS-5885 are still being studied for their safety and efficacy.
The biopharmaceutical company will present the data on Tuesday at the annual meeting of the American Association for the Study of Liver Diseases in Boston.
Mark Schoenebaum, a biotech analyst with ISI Group, said in a research note that he expects Gilead shares to rise on Monday based on these "best case" results.
UBS analyst Matthew Roden said "these data strongly support Gilead's leadership position" in the hepatitis C virus space.
Gilead recently started the first Phase 3 trial evaluating a fixed-dose combination of sofosbuvir and GS-5885 in patients with genotype 1 chronic hepatitis C virus infection who had not received these drugs before.
This study is evaluating the fixed-dose combination with and without ribavirin for 12- and 24-weeks in 800 patients, 20 percent of whom have evidence of cirrhosis, or liver scarring.
(Reporting By Debra Sherman; Editing by Vicki Allen)
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