A 24-week Study to Compare Umeclidinium/Vilanterol (UMEC/VI), UMEC and Salmeterol in Subjects With Chronic Obstructive Pulmonary Disease (COPD)

Inclusion Criteria

• 40 years or older at date of signing informed consent at Screening Visit 1
• Outpatient with a diagnosis of COPD
• Persistent airflow limitations as indicated by a pre and post-albuterol/salbutamol FEV1/FVC ratio of =30% to =10 at Screening Visit 1
• Current or former cigarette smokers with a history of cigarette smoking of >=10 pack-years (number of pack years = [number of cigarettes per day / 20] multiplied by number of years smoked [e.g., 20 cigarettes per day for 10 years, or 10 cigarettes per day for 20 years both equal 10 pack-years]). Former smokers are defined as those who have stopped smoking for at least 6 months prior to Visit 1. Pipe and/or cigar use cannot be used to calculate pack-year history.
• Male and female subjects are eligible to participate in the study. A female subject is eligible to participate if she is not pregnant (as confirmed by a negative urine human chorionic gonadotrophin test), not lactating, and at least one of the following conditions applies: non-reproductive potential defined as pre-menopausal females with documented tubal ligation or documented hysteroscopic tubal occlusion procedure with follow-up confirmation of bilateral tubal occlusion or hysterectomy or documented bilateral oophorectomy. Postmenopausal defined as 12 months of spontaneous amenorrhea. In questionable cases, a blood sample with simultaneous follicle stimulating hormone and estradiol levels consistent with menopause must be tested. Females on hormone replacement therapy (HRT) and whose menopausal status is in doubt will be required to use one of the highly effective contraception methods if they wish to continue their HRT during the study. Otherwise, they must discontinue HRT to allow confirmation of post-menopausal status prior to study enrolment.

A female subject with reproductive potential is eligible to participate if she is not pregnant and agrees to follow one of the highly effective methods for avoiding pregnancy in females of reproductive potential from 30 days prior to the first dose of study medication and until (at least five terminal half-lives or until any continuing pharmacologic effect has ended, whichever is longer) after the last dose of study medication and completion of the follow-up visit. The investigator is responsible for ensuring that subjects understand how to properly use methods of contraception.

• Capable of giving signed informed consent prior to study participation.

Exclusion criteria

• A current diagnosis of asthma (Subjects with a prior history of asthma are eligible if they have a current diagnosis of COPD, which is the primary cause of their respiratory symptoms).
• Subjects with known alpha-antitrypsin deficiency as the underlying cause of COPD
• Subjects with active tuberculosis are excluded. Subjects with other respiratory disorders (e.g., clinically significant: bronchiectasis, sarcoidosis, lung fibrosis, pulmonary hypertension, interstitial lung diseases) are excluded if these conditions are the primary cause of their respiratory symptoms.
• Current active liver or biliary disease (with the exception of Gilbert's syndrome or asymptomatic gallstones or otherwise stable chronic liver disease as per investigator assessment); stable chronic liver disease should generally be defined by the absence of ascites, encephalopathy, coagulopathy, hypoalbuminaemia, oesophageal or gastric varices, or persistent jaundice, or cirrhosis; chronic stable hepatitis B and C (e.g., presence of hepatitis B surface antigen or positive hepatitis C antibody test result or within 3 months prior to first dose of study treatment) are acceptable if subject otherwise meets entry criteria.
• Subjects with unstable or life threatening cardiac disease. The investigational product should be used with caution in subjects with severe cardiovascular disease. In the opinion of the investigator, use will only be considered if the benefit is likely to outweigh the risk in conditions such as myocard