An Efficacy and Safety Study of Fluticasone Furoate/Vilanterol 100/25 Microgram (mcg) Inhalation Powder, Fluticasone Propionate/Salmeterol 250/50 mcg Inhalation Powder, and Fluticasone Propionate 250 mcg Inhalation Powder in Adults and Adolescents With Persistent Asthma
An Efficacy and Safety Study of Fluticasone Furoate/Vilanterol 100/25 Microgram (mcg) Inhalation Powder, Fluticasone Propionate/Salmeterol 250/50 mcg Inhalation Powder, and Fluticasone Propionate 250 mcg Inhalation Powder in Adults and Adolescents With Persistent Asthma
This study is a randomized, double-blind, double-dummy, parallel group, multicenter,
 non-inferiority study. The study will enroll adult and adolescent asthmatic subjects who are
 currently receiving mid dose inhaled corticosteroids (ICS) plus long-acting beta2-agonist
 (LABA) (equivalent to fluticasone propionate [FP]/salmeterol 250/50 microgram [mcg]twice
 daily [BD]), either via a fixed dose combination product or through separate inhalers. The
 study consists of a LABA washout period of 5 days and a run-in period of 4 weeks, followed by
 a treatment period of 24 weeks, and a follow up contact period of one week. The total
 duration of the study is 30 weeks. Approximately 1461 subjects will be randomized to one of
 the following three treatments (487 per treatment): fluticasone furoate (FF)/vilanterol (VI)
 100/25 mcg once daily (OD) in the evening (PM) via ELLIPTA™ inhaler plus placebo BD via
 ACCUHALER™/DISKUS™; FP/salmeterol 250/50 mcg BD via ACCUHALER/DISKUS inhaler plus placebo OD
 (PM) via ELLIPTA inhaler; FP 250 mcg BD via ACCUHALER/DISKUS inhaler plus placebo OD (PM) via
 ELLIPTA inhaler. In addition, all subjects will be supplied with albuterol/salbutamol
 inhalation aerosol to use as needed to treat acute asthma symptoms. This study will determine
 if FF/VI 100/25 mcg OD via ELLIPTA inhaler is non-inferior to FP/salmeterol 250/50 mcg BD via
 ACCUHALER/DISKUS inhaler in adult and adolescent asthmatic subjects already adequately
 controlled on a twice-daily ICS/LABA.

 SERETIDE, ELLIPTA, ACCUHALER, RELVAR, and DISKUS are trademarks of the GlaxoSmithKline Group
 of Companies.
Inclusion Criteria

 -  Subjects must give their signed and dated written informed consent to participate
 prior to commencing any study related activities.

 -  Subjects must be outpatients >=12 years of age at Visit 1 who have had a diagnosis of
 asthma, as defined by the National Institutes of Health, for at least 12 weeks prior
 to Visit 1 (Note: Countries with local restrictions prohibiting enrollment of
 adolescents will enroll subjects >=18 years of age only).

 -  Subjects may be male or an eligible female. An eligible female is defined as having
 non-childbearing potential or having childbearing potential and a negative urine
 pregnancy test at Screening and agrees to use an acceptable method of birth control
 consistently and correctly.

 -  Subjects must have a FEV1 of >=80% of the predicted normal value.

 -  Subjects are eligible if they have received mid dose ICS plus LABA (equivalent to
 FP/salmeterol 250/50 twice daily or an equivalent combination via separate inhalers)
 for at least the 12 weeks immediately preceding Visit 1.

 -  All subjects must be able to replace their current SABA treatment with
 albuterol/salbutamol aerosol inhaler at Visit 1 for use, as needed, for the duration
 of the study. Subjects must be able to withhold albuterol/salbutamol for at least 6
 hours prior to study visits.

 -  If in the opinion of the investigator the subject's asthma is well controlled.
 Exclusion Criteria

 -  History of Life-Threatening Asthma, defined for this protocol as an asthma episode
 that required intubation and/or associated with hypercapnea, respiratory arrest or
 hypoxic seizures within the last 5 years.

 -  Culture-documented or suspected bacterial or viral infection of the upper or lower
 respiratory tract, sinus or middle ear that is not resolved within 4 weeks of Visit 1
 and led to a change in asthma management or in the opinion of the Investigator,
 expected to affect the subject's asthma status or the subject's ability to participate
 in the study.

 -  Any asthma exacerbation requiring oral corticosteroids within 12 weeks of Visit 1 or
 resulting in an overnight hospitalization requiring additional treatment for asthma
 within 6 months prior to Visit 1.

 -  A subject must not have current evidence of Atlectasis, Bronchopulmonary dysplasia,
 Chronic bronchitis, Chronic obstructive pulmonary disease, Pneumonia, Pneumothorax,
 Interstitial lung disease, or any evidence of concurrent respiratory disease other
 than asthma

 -  A subject must not have any clinically significant, uncontrolled condition or disease
 state that, in the opinion of the investigator, would put the safety of the subject at
 risk through study participation or would confound the interpretation of the results
 if the condition/disease exacerbated during the study.

 -  A subject must not have used any investigational drug within 30 days prior to Visit 1
 or within five half-lives (t½) of the prior investigational study, whichever is longer
 of the two.

 -  Any adverse reaction including immediate or delayed hypersensitivity to any
 beta2-agonist, sympathomimetic drug, or any intranasal, inhaled, or systemic
 corticosteroid therapy. Known or suspected sensitivity to the constituents of RELVAR™
 ELLIPTA inhaler, SERETIDE™ ACCUHALER/DISKUS inhaler or FP 250.

 -  History of severe milk protein allergy.

 -  Administration of prescription or non-prescription medication that would significantly
 affect the course of asthma, or interact with study drug.

 -  A subject must not be using or require the use of immunosuppressive medications during
 the study.

 -  A subject will not be eligible if he/she or his/her parent or legal guardian has any
 infirmity, disability, disease, or geographical location which seems likely (in the
 opinion of the Investigator) to impair compliance with any aspect of this study
 protocol, including visit schedule and completion of the daily diaries.

 -  Current tobacco smoker or has a smoking history of 10 pack-years (20 cigarettes/day
 for 10 years). A subject may not have used inhaled tobacco products or inhaled
 marijuana within the past 3 months (e.g., cigarettes, cigars, electronic cigarettes,
 or pipe tobacco).

 -  A subject will not be eligible for this study if he/she is an immediate family member
 of the participating investigator, sub-investigator, study coordinator, or employee of
 the participating investigator.