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Results From the AMBITION Study of First-Line Treatment With Letairis and Tadalafil in Pulmonary Arterial
Hypertension Published in The New England Journal of Medicine

August 26, 2015 5:01 PM ET FOSTER CITY, Calif.--(BUSINESS WIRE)--Aug. 26, 2015-- Gilead Sciences, Inc. (Nasdaq: GILD) today announced
detailed results from the AMBITION study (a randomized, double-blind, multicenter study of first-line combination
therapy with AMBrIsentan and Tadalafil in patients with pulmonary arterial hypertensION). In AMBITION, conducted
in collaboration with GlaxoSmithKline (GSK), combination therapy with Letairis® (ambrisentan) and tadalafil reduced therisk of clinical failure by 50 percent compared to the pooled Letairis and tadalafil monotherapy arm (hazard ratio = 0.50;95 percent CI: 0.35, 0.72; p<0.001). These data were published in The New England Journal of Medicine.
Letairis, a selective endothelin type-A receptor antagonist, and tadalafil, a PDE5 inhibitor, are each approved in the UnitedStates (U.S.), the European Union (EU) and other countries as once-daily treatments for patients with pulmonary arterialhypertension (PAH) (WHO Group 1) with WHO/NYHA functional class II and III symptoms. Letairis is indicated in the U.S. to improve exercise ability and delay clinical worsening and in the EU under the tradename Volibris® to improveexercise capacity. Tadalafil 40 mg is indicated in the U.S. and the EU to improve exercise ability and capacity, respectively.
Preclinical data have suggested these therapies may have synergistic effects. However, combination use with Letairis andtadalafil is currently not approved.
"The only other published, large-scale, event-driven study to date in PAH compared an endothelin receptor antagonist toplacebo in patients who were either treatment-naïve or on background therapy, however, all patients in AMBITIONreceived an approved therapy for PAH," said Lewis J. Rubin, MD, Emeritus Professor, University of California, SanDiego and Co-Chair of the AMBITION Steering Committee. "Thus, the magnitude of the effect with this combination incomparison to active monotherapy is impressive, particularly in WHO functional class II patients where we observednearly an 80 percent reduction in risk of clinical failure versus monotherapy." AMBITION was a multicenter, randomized, double-blind phase 3/4 study designed to compare the safety and efficacy ofinvestigational first-line combination therapy (Letairis and tadalafil) to first-line monotherapy (Letairis or tadalafil) inpatients with WHO/NYHA functional class II and III PAH. In the primary study analysis, 500 patients were randomized(2:1:1) to receive Letairis and tadalafil (n=253) or monotherapy with Letairis (n=126) or tadalafil (n=121) (titrated from 5mg to 10 mg once-daily and from 20 mg to 40 mg once-daily for Letairis and tadalafil, respectively).
The primary endpoint was time to first clinical failure event, a composite endpoint that incorporates both the traditionalcomponents of clinical worsening (death, hospitalization and disease worsening) with a component of unsatisfactorylong-term clinical response (all events adjudicated by an independent, blinded committee).
The treatment effect for the composite primary endpoint of time to clinical failure was driven mainly by a reduced numberof hospitalizations due to PAH, with a reduced risk of hospitalization due to PAH of 63 percent (hazard ratio = 0.37; 95percent CI: 0.22, 0.64; p<0.001).
Consistently favorable reductions in clinical failure events were observed based on etiology, WHO functional class, age,geographical area and gender. The predefined subgroup analysis of the primary endpoint suggested that patients withWHO functional class II (n=155; hazard ratio = 0.21; 95 percent CI: 0.07, 0.63); p=0.005) responded even morepositively than patients with WHO functional class III (n=345; hazard ratio = 0.58; 95 percent CI: 0.39, 0.86; p=0.006).
Statistically significant improvements were also observed with the following secondary endpoints versus the pooledmonotherapy arm: change from baseline at week 24 in N-terminal pro-B-type natriuretic peptide (NT-proBNP) (-67percent vs. -50 percent; p<0.001), percentage of patients with satisfactory clinical response at week 24 (39 percent vs. 29percent; odds ratio 1.56; p=0.03) and median change from baseline to week 24 in six-minute walk distance (6MWD) (49meters vs. 24 meters; p<0.001). There was no difference between treatment groups in the change from baseline to week 24 for WHO functional class.
No new safety signals were detected with the combination of Letairis and tadalafil. Adverse events occurring morefrequently in the combination arm than in either monotherapy arm were peripheral edema (Combination: 45 percent;Letairis: 33 percent; tadalafil: 28 percent), headache (Combination: 42 percent; Letairis: 33 percent; tadalafil: 35 percent),nasal congestion (Combination: 21 percent; Letairis: 15 percent; tadalafil: 12 percent) and anemia (Combination: 15percent; Letairis: 6 percent; tadalafil: 12 percent).
Additional results from the study are available at www.nejm.org.
Gilead submitted the AMBITION data in a Letairis supplemental new drug application (sNDA) to the U.S. Food andDrug Administration (FDA) on December 5, 2014. FDA has granted a standard review and set a target review date underthe Prescription Drug User Fee Act (PDUFA) of October 5, 2015.
In the U.S., Letairis has a labeled BOXED WARNING and an associated Risk Evaluation and Mitigation Strategy (REMS)
program regarding the risk of embryo-fetal toxicity; see below for Important U.S. Safety Information for Letairis.
AMBITION was cosponsored by Gilead and GSK. Eli Lilly and Company also provided funding and tadalafil drugsupply for the trial. Gilead commercializes ambrisentan under the tradename Letairis in the U.S. and GSK commercializes ambrisentan under the tradename Volibris® in territories outside of the United States.
About Pulmonary Arterial Hypertension (WHO Group 1)
PAH is a debilitating disease characterized by constriction of the blood vessels in the lungs leading to high pulmonaryarterial pressures. These high pressures make it difficult for the heart to pump blood through the lungs to be oxygenated.
Patients with PAH suffer from shortness of breath as the heart struggles to pump against these high pressures, causingsuch patients to ultimately die of heart failure. PAH can occur with no known underlying cause, or it can occur secondaryto diseases such as connective tissue disease, congenital heart defects, cirrhosis of the liver and HIV infection.
Important U.S. Safety Information for Letairis
BOXED WARNING: EMBRYO-FETAL TOXICITY
Do not administer Letairis to a pregnant female because it may cause fetal harm. Letairis is very likely to
produce serious birth defects if used by pregnant females, as this effect has been seen consistently when it is
administered to animals.

Exclude pregnancy before the initiation of treatment with Letairis. Females of reproductive potential must use
acceptable methods of contraception during treatment with Letairis and for one month after treatment.
Obtain
monthly pregnancy tests during treatment and 1 month after discontinuation of treatment.

Because of the risk of embryo-fetal toxicity birth defects, females can only receive Letairis through a restricted
program called the Letairis REMS program.

Do not administer Letairis to a pregnant woman because it can cause fetal harm.
Letairis is contraindicated in patients with Idiopathic Pulmonary Fibrosis (IPF) including IPF patients withpulmonary hypertension (WHO Group 3).
Warnings and precautions
Embryo-fetal Toxicity: Letairis may cause fetal harm when administered during pregnancy.
Letairis REMS Program: For all females, Letairis is only available through a restricted program called Letairis
REMS. Some requirements of the Letairis REMS Program include:
Prescribers must be certified with the program by enrolling and completing training.
All females, regardless of reproductive potential, must enroll in the Letairis REMS Program prior to initiatingLetairis. Male patients are not enrolled in the REMS.
Pharmacies that dispense Letairis must be certified with the program and must dispense to female patientswho are authorized to receive Letairis.
Further information is available at www.letairisrems.com or 1-866-664-5327.
Mild to moderate peripheral edema: Peripheral edema occurred more frequently in elderly patients (age ≥65
years) receiving Letairis (29 percent; 16/56) compared to placebo (4 percent; 1/28). Peripheral edema is a known
class effect of endothelin receptor antagonists. In addition, there have been postmarketing reports of fluid retention
occurring within weeks after starting Letairis that required intervention with a diuretic, fluid management, or, in
some cases, hospitalization for decompensating heart failure.
Pulmonary Edema with PVOD: If patients develop acute pulmonary edema during initiation of therapy with
vasodilating agents such as Letairis, pulmonary veno-occlusive disease should be considered, and if confirmed,
Letairis should be discontinued.
Decreases in sperm count have been observed in patients taking endothelin receptor antagonists and in animal
fertility studies with ambrisentan. Counsel patients about potential effects on fertility.
Hematologic changes: Decreases in hemoglobin have been observed within the first few weeks of treatment with
Letairis, and may persist during treatment. There have been postmarketing reports of anemia requiring transfusion.
Measure hemoglobin prior to initiation, at 1 month, and periodically thereafter. Initiation of Letairis therapy is not
recommended for patients with clinically significant anemia.
Most Common Adverse Reactions (>3% compared to placebo)
Placebo (N=132) LETAIRIS (N=261)
Adverse reaction n (%)
n (%) Placebo-adjusted (%)
During 12-week controlled clinical trials, the incidence of liver aminotransferase (AST, ALT) elevations >3x ULNwas 0 percent for Letairis and 2.3 percent for placebo.
In postmarketing experience, elevations of aminotransferases have been reported with Letairis use; in most casesalternative causes of liver injury could be identified (heart failure, hepatic congestion, hepatitis, alcohol use,hepatotoxic medications). In practice, cases of hepatic injury should be carefully evaluated for cause.
Other ERAs have been associated with aminotransferase elevations, hepatotoxicity, and cases of liver failure.
Discontinue Letairis if aminotransferase elevations are >5x ULN or if elevations are accompanied by bilirubin >2xULN or by signs or symptoms of liver dysfunction, and other causes are excluded.
Multiple-dose co-administration of Letairis and cyclosporine resulted in an approximately two-fold increase inLetairis exposure in healthy volunteers. Limit the dose of Letairis to 5 mg once daily when co-administered with Dosage and administration
Adult Dosage: Initiate treatment at 5 mg once daily, and consider increasing the dose to 10 mg once daily if 5 mg is
tolerated. Tablets may be taken with or without food. Tablets should not be split, crushed, or chewed. Doses higher than
10 mg once daily have not been studied in patients with pulmonary arterial hypertension (PAH).
Pregnancy Testing in Females of Reproductive Potential: Initiate treatment with, Letairis in females of reproductive
potential only after a negative pregnancy test. Obtain monthly pregnancy tests during treatment.
Not recommended in patients with moderate or severe hepatic impairment. There is no information on the use of Letairisin patients with mild hepatic impairment; however, exposure to Letairis may be increased in these patients.
About Gilead Sciences
Gilead Sciences is a biopharmaceutical company that discovers, develops and commercializes innovative therapeutics inareas of unmet medical need. The company's mission is to advance the care of patients suffering from life-threateningdiseases worldwide. Gilead has operations in more than 30 countries worldwide, with headquarters in Foster City,California.
This press release includes forward-looking statements, within the meaning of the Private Securities Litigation Reform Actof 1995, that are subject to risks, uncertainties and other factors, including the possibility that the FDA and otherregulatory authorities may not approve the sNDA in the currently anticipated timelines or at all. In addition, anymarketing approvals, if granted, may have significant limitations on use. Further, even if approved, physicians may notsee the benefit of combination therapy with Letairis and tadalafil. These risks, uncertainties and other factors could causeactual results to differ materially from those referred to in the forward-looking statements. The reader is cautioned not torely on these forward-looking statements. These and other risks are described in detail in Gilead's Quarterly Report onForm 10-Q for the quarter ended June 30, 2015, as filed with the U.S. Securities and Exchange Commission. All forward-looking statements are based on information currently available to Gilead, and Gilead assumes no obligation to update anysuch forward-looking statements.
U.S. full prescribing information including BOXED WARNING for Letairis is available at www.gilead.com. Letairis and Volibris are registered trademarks of Gilead Sciences, Inc. or one of its related companies. For more information on Gilead Sciences, please visit the company's website at www.gilead.com, follow Gilead on Twitter(@GileadSciences) or call Gilead Public Affairs at 1-800-GILEAD-5 or 1-650-574-3000. View source version on businesswire.com: http://www.businesswire.com/news/home/20150826006141/en/ Source: Gilead Sciences, Inc.
Gilead Sciences, Inc.
Patrick O'Brien, 650-522-1936 (Investors)Nathan Kaiser, 650-522-1853 (Media)

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