AMBER I: Ambrisentan for Inoperable Chronic Thromboembolic Pulmonary Hypertension.

• Sponsor: GlaxoSmithKline (Industry)
• Overall Status: Terminated
• CT.gov ID: NCT01884675
• Collaborator: (none)
• Enrollment: 33
• Locations: 51
• Arms: 2
• Duration (Months): 17.9
• Patients Per Site: 0.6
• Patients Per Site Per Month: 0

Study Details

Study Description

Brief Summary

It is hypothesised that ambrisentan may provide benefit to subjects with inoperable chronic thromboembolic pulmonary hypertension (CTEPH), where currently no proven or licensed treatment options exist. This Phase III, randomized, double-blind placebo controlled parallel group, 16 week study will compare the safety and efficacy of ambrisentan 5 milligrams (mg) versus placebo in subjects with inoperable CTEPH. The study will enrol 160 subjects, to assure at least 72 evaluable subjects per treatment arm, based on 10% drop-out rate.

Condition or Disease	Intervention/Treatment	Phase
Hypertension	Drug: Ambrisentan 5 mg; Drug: Placebo	Phase 3

Study Design

• Study Type: Interventional
• Actual Enrollment: 33 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: Double (Participant, Investigator)
• Primary Purpose: Treatment
• Official Title: A Randomised, Multicentre, Double-Blind, Placebo-Controlled Study Of Ambrisentan In Subjects With Inoperable Chronic Thromboembolic Pulmonary Hypertension (CTEPH).
• Study Start Date: Sep 1, 2013
• Actual Primary Completion Date: Mar 1, 2015
• Actual Study Completion Date: Mar 1, 2015

Arms and Interventions

Arm	Intervention/Treatment
Experimental: Ambrisentan Subjects in this arm will receive ambrisentan 5 mg tablet once daily during the treatment period.	Drug: Ambrisentan 5 mg; White, film-coated, immediate-release tablets, containing 5 mg ambrisentan for single dose oral.
Placebo Comparator: Placebo Subjects in this arm will receive ambrisentan-matching placebo tablet once daily during the treatment period.	Drug: Placebo; White, film-coated, ambrisentan-matching placebo tablet for single oral dose

Outcome Measures

Primary Outcome Measures

1. Change From Baseline in Six Minutes Walking Distance (6MWD) at Week 16 [Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal]

   The 6-minute walk test was conducted according to the American Thoracic Society guidelines in accordance with local standard operating procedures. 6MWD was measured by a 6-minute walk test. This test measures the distance that a participant can walk in a period of 6 minutes. Change from baseline was calculated at Weeks 4, 8, 12 and 16. Change from Baseline was calculated as value at the specified visit minus the Baseline value. Data at Baseline is based on average of two consecutive test results during Screening/Baseline period that differ by <10%. If only one measurement was available, that measurement was used. In any cases where the protocol-defined criteria for Baseline 6MWD was not met, the Baseline value was based on the last two consecutive measurements for a participant.

Secondary Outcome Measures

1. Change From Baseline in Pulmonary Vascular Resistance (PVR) at Week 16 [Baseline (Week 0) and Week 16]

   PVR is a measure of cardiopulmonary haemodynamics. Change from Baseline was calculated as value at specified visit minus Baseline value. Baseline is the last value recorded on or prior to start of study treatment.

2. Change From Baseline in WHO Functional Class (FC) at Weeks 4, 8, 12 and 16/Early Withdrawal [Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal]

   The WHO FC indicates the severity of PAH and is an adaptation of the New York Heart Association classification. It was assessed by the investigator. There are four grades for WHO FC based on severity of symptoms (Class I = none, Class IV = most severe). This functional classification system links symptoms with activity limitations, and allows clinicians to quickly predict disease progression and prognosis, as well as the need for specific treatment regimens, irrespective of the underlying etiology of PAH. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the value at specified visit minus the Baseline value. For analyse purposes, the WHO FC Class categories of I-IV were mapped to a numeric scale of 1-4.

3. Change From Baseline in Borg CR10 Scale (BCR10S) Immediately Following Exercise at Weeks 4, 8, 12 and 16/Early Withdrawal [Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal]

   The BCR10S score was collected immediately following completion of the 6-minute walk test. Baseline data was calculated as the average of the two BCR10S values obtained following the two 6MWD tests used in determining the Baseline 6MWD. If only one measurement was available, that measurement has been used. BCR10S scores ranges from 0 to 10 (0=nothing at all, 10=extremely strong). If participant's perception or feeling was stronger than "10", i.e "extremely strong", "Maximal" - a larger number could be used, e.g. 12 or still higher i.e "Absolute maximum"). Change from Baseline was calculated as the value at specified visit minus the Baseline value.

4. Number of Participants With Clinical Worsening of Chronic Thromboembolic Pulmonary Hypertension (CTEPH) [From randomization to Week 16/Follow up visit (21 weeks)]

   Clinical worsening of CTEPH is defined by the time from randomization to the first occurrence of death, lung transplantation, hospitalization for CTEPH, atrial septostomy, addition of parenteral prostanoids, or study withdrawal due to two or more early escape criteria included: a decrease from Baseline of at least 20 percent in the distance walked during the six-minute walk test; an increase of one or more WHO functional class; worsening right ventricular failure (e.g., as indicated by increased jugular venous pressure; new/worsening hepatomegaly, ascites, or peripheral edema; worsening echocardiographic parameters such as tricuspid annulus plane systolic excursion (TAPSE) and Tissue Doppler Imaging of the tricuspid annulus); rapidly progressing cardiogenic, hepatic, or renal failure; refractory systolic hypotension (systolic blood pressure less than 85 millimeter of mercury [mmHg]).

5. Change From Baseline in Mean Right Atrial Pressure (mRAP) and Mean Pulmonary Artery Pressure (mPAP) at Week 16 [Baseline (Week 0) and Week 16]

   mPAP and mRAP are measures of cardiopulmonary hemodynamics. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the value at specified visit minus the Baseline value.

6. Change From Baseline in Cardiac Index at Week 16 [Baseline (Week 0) and Week 16]

   Cardiac index is measure of cardiopulmonary hemodynamics. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the value at specified visit minus the Baseline value.

7. Percent Change From Baseline in Plasma N-terminal Pro-B-type Natriuretic Peptide (NT-proBNP) [Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal]

   The ratio to baseline [BL] in NT-proBNP was calculated as the ratio of the value at the specified time-point to the BL value and was expressed as a percent change from BL. For each treatment group, the mean change from BL at the specified time-point was determined on the log scale. This mean was then back transformed to give a geometric mean (GM) of the ratio of the value at the specified time-point to BL on the original scale. The GM was expressed as a percentage (100*[GM - 1]). Standard Deviation(SD) is the SD of the mean change from baseline values on the log scale.

8. Change From Baseline in Quality of Life as Measured by Short Form 36 Health Survey (SF-36) [Baseline and up to Week 16/Early Withdrawal]

   The SF-36 v2 is a self-administered, health-related quality of life (QoL) metric. It is a 36-item questionnaire designed to measure 8 domains of functional health status and well-being: physical functioning, role-physical, bodily pain, general health perceptions, vitality, social functioning, role-emotional, and mental health as well as 2 summary measures (Physical Health and Mental Health). Each domain is scored from 0 (poorer health) to 100 (better health). Change from Baseline was calculated as the post-Baseline score minus the Baseline score. The SF-36 data were collected, but after the study was terminated, not all endpoints listed in the protocol were analyzed, including the SF-36. This decision was documented in the reporting and analysis plan prior to database lock.

9. Number of Participants With Any Adverse Events (AEs) and Serious Adverse Events (SAEs) [From the start of study treatment and until follow up (Week 16/Follow up)]

   AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a medicinal product. For marketed medicinal products, this also includes failure to produce expected benefits (i.e., lack of efficacy), abuse or misuse. A SAE is defined as any untoward medical occurrence that, at any dose results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity or is a congenital anomaly/birth defect or important medical events that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed in the above definition.

10. Change From Baseline in Haemoglobin Levels at Weeks 4, 8, 12, and 16/Early Withdrawal [Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal]

    Haemoglobin levels were assessed at Screening, Baseline, Weeks 4, 8, 12, and 16/Early Withdrawal. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

11. Change From Baseline in Haematocrit Levels at Weeks 4, 8, 12, and 16/Early Withdrawal [Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal]

    Haematocrit levels were assessed at Screening, Baseline, Weeks 4, 8, 12, and 16/Early Withdrawal. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

12. Number of Participants With Significant Liver Events at Weeks 4, 8, 12, and 16/Early Withdrawal [Weeks 4, 8, 12, and 16/Early Withdrawal]

    A significant liver chemistry result is defined as any result which met the stopping criteria defined in the study protocol. Liver events were assessed at Screening, Baseline, Weeks 4, 8, 12, and 16/Early Withdrawal. Number of participants who reported a significant liver chemistry result are presented.

13. Change From Baseline in Supine Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) Assessed at Weeks 4, 8, 12, and 16/Early Withdrawal [Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal]

    Vital sign measurements including supine systolic and diastolic blood pressure at Weeks 4, 8, 12, and 16/Early Withdrawal weeks. Supine blood pressure measurement was taken in a supine position having rested in this position for at least 10 minutes before each reading. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

14. Change From Baseline in Heart Rate Assessed at Weeks 4, 8, 12, and 16/Early Withdrawal [Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal]

    Vital sign measurements including heart rate at Weeks 4, 8, 12, and 16/Early Withdrawal weeks. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

15. Number of Participants With Clinical Chemistry Parameters of Potential Clinical Concern Any Time Post Baseline [Baseline (Week 0), Weeks 4, 8, 12 and 16/early withdrawal,]

    Clinical chemistry parameters including alanine amino transferase (ALT), aspartate amino transferase (AST), creatinine, gamma glutamyl transferase (GGT) and total bilirubin (TB) assessed any time post Baseline. ALT: lower concern value and high concern value was considered as none and >=3xupper limit of normal (ULN) respectively. AST: lower concern value and high concern value was considered as none or >=3xULN respectively. creatinine: lower concern value and high concern value was considered as none and >=176.8 micromoles per liter (umol/L) respectively. GGT: lower concern value and high concern value was considered as none and >=3xULN respectively. For TB: lower concern value was none and high concern value was >=2xULN. Participants with both normal and low values were counted once under their worst case (Low). Participants with both normal and high values were counted once under their worst case (High). Participants with both high and low values are counted under both categories.

16. Number of Participants With Hematology Parameters of Potential Clinical Concern Any Time Post Baseline [Baseline (Week 0), Weeks 4, 8, 12 and 16/early withdrawal]

    Hematology parameters including hemoglobin, international normalized ratio (INR), and platelet count assessed any time post Baseline. Baseline is the last value recorded on or prior to start of study treatment. For hemoglobin: lower concern value and high concern value was considered as <100 gram per liter (G/L) and none respectively. For INR: lower concern value and high concern value was considered as none or >5 prothrombin time respectively. For platelet count: lower concern value and high concern value was considered as <50 giga cells per liter (GI/L) and >500 GI/L respectively. Participants with both normal and low values were counted once under their worst case (Low). Participants with both normal and high values were counted once under their worst case (High). Participants with both high and low values are counted under both categories.

17. Number of Participants With Testicular Function (Males Only) of Potential Clinical Concern Any Time Post Baseline [Baseline, Weeks 4 and 16/early withdrawal]

    For male participants testicular function (total testosterone, sex hormone binding globulin [SHBG-calculated free testosterone), follicle stimulating hormone (FSH), luteinizing hormone (LH), and inhibin B were assessed at Weeks 4 and 16/early withdrawal. The testicular function data were collected, but after the study was terminated, not all endpoints listed in the protocol were analyzed, including Testicular Function. This decision was documented in the reporting and analysis plan prior to database lock.

Eligibility Criteria

Criteria

• Ages Eligible for Study: 18 Years to 80 Years
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Inclusion Criteria:

• Signed written informed consent prior to beginning study-related procedures.

• Subject must be between 18-80 years of age, inclusive, at the Screening Visit.

• Subjects must have a diagnosis of CTEPH at an expert centre with a positive V/Q and CT angiogram and a pulmonary angiogram if available within 6 months prior to screening.

• Subject must meet all of the following haemodynamic criteria by means of a RHC within 3 months prior to screening: Mean pulmonary artery pressure (mPAP) of >25 millimeters of mercury (mmHg), Pulmonary vascular resistance (PVR) >400 dynes.sec/centimetre (cm)^5, Pulmonary capillary wedge pressure (PCWP) or Left ventricle end diastolic pressure (LVEDP) of <15 mmHg.

• Subjects must have previously been judged inoperable due to the obstruction being surgically inaccessible (i.e. distal disease) by an expert multidisciplinary team which must include at least one cardiology or respiratory consultant, and one consultant PEA surgeon. For countries with CTEPH expert centers [including at least a surgeon with sound experience performing Pulmonary Endarterectomy (PEAs)] the expert team will be the local expert centre. For countries without a CTEPH surgical expert center a central adjudication committee will assess the operability of the subjects during the screening period.

• Subject must walk a distance of >150 Meters (m) and < 475 m at the screening visit.

• Subject must have a current diagnosis of being in WHO Functional Class II or III.

• Subject, with or without supplemental oxygen, must have a resting arterial oxygen saturation (SaO2) > 92% as measured by pulse oximetry at the Screening Visit.

• Subjects must have received anticoagulation for a minimum of 3 months prior to Screening

• Female subject of childbearing potential must agree to use 2 reliable methods of contraception from the Screening Visit until study completion and for at least 30 days following the last dose of Investigational Product

• Subject must agree not to participate in a clinical study involving another investigational drug or device throughout this study.

• Subject must be competent to understand the information given in the Institutional Review Board (IRB) or Independent Ethics Committee (IEC) approved informed consent form (ICF) and must sign the form prior to the initiation of any study procedures.

Exclusion Criteria:

• Subject received previous Pulmonary arterial hypertension (PAH) therapy (Phosphodiesterase type 5 [PDE5i], Endothelin receptor antagonist [ERA], chronic prostanoid use)

• Subject has previously discontinued other ERA in either another clinical study or commercial product for safety or tolerability reasons other than for liver function abnormalities.

• Subject has a known hypersensitivity to the Investigational Products, the metabolites, or formulation excipients

• Subject has previously undergone a pulmonary endarterectomy or a balloon pulmonary angioplasty

• Subject receiving intravenous inotropes within 2 weeks prior to the Screening Visit (e.g. dopamine, dobutamine)

• Subjects receiving Calcium Channel Blockers or 5-hydroxy-3-methylglutaryl-coenzyme A 5-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors (i.e., statins) on an unstable dose 4 weeks prior to the Screening Visit (to be eligible subjects must not have changed their dose <4 weeks prior to the screening visit)

• Subject has not enrolled in an exercise training program for cardiopulmonary rehabilitation within 12 weeks prior to the Screening Visit and must agree not to enroll in an exercise training program for pulmonary rehabilitation during the Screening Period and the first 16 weeks of the study. Subjects enrolled in an exercise program for pulmonary rehabilitation 12 weeks prior to screening may enter the study if they agree to maintain their current level of rehabilitation for the first 16 weeks of the study.

• Alanine aminotransferase (ALT) and/or Aspartate aminotransferase (AST) > 3x Upper limit of normal (ULN)

• Bilirubin > 1.5xULN (>35% direct bilirubin)

• Subject has severe renal impairment [estimated creatinine clearance <30 millilitre/minute (mL/min)] at the Screening Visit

• Subject has moderate - severe hepatic impairment (Child-Pugh class B-C with or without cirrhosis) at the Screening Visit

• Subject has clinically significant anaemia: Hemoglobin (Hb) < 10 grams/decilitre (g/dL)

• Subjects with bleeding disorders or significant active peptic ulceration in the opinion of the investigator

• Subject has uncontrolled hypertension (>180/110 mmHg) at screening

• Subject has severe hypotension (<90/50 mmHg) at screening

• Subject has had an acute myocardial infarction within the last 90 days prior to screening

• Subject has, in the opinion of the investigator, clinically significant aortic or mitral valve disease; pericardial constriction; restrictive or congestive cardiomyopathy; life-threatening cardiac arrhythmias; significant left ventricular dysfunction (ejection fraction <50% of normal); left ventricular outflow obstruction; symptomatic coronary artery disease; autonomic hypotension; fluid depletion.

• Subject with significant pulmonary disease Forced expiratory volume in 1 second (FEV1) <70% of predicted): Chronic obstructive pulmonary disease (COPD), Emphysema, evidence of fibrotic lung disease on imaging

• Subject has clinically significant fluid retention in the opinion of the investigator

• Subject with significant obesity [Body mass index (BMI) ≥35], cardiovascular, musculoskeletal or any other condition that in the opinion of the investigator may involve an impairment of exercise capacity or the performance of the 6MWD test (e.g. previous history of hip/knee surgery, lower limb ulcers associated with autoimmune diseases)

• Subject with cardiovascular, liver, renal, haematologic, gastrointestinal, immunologic, endocrine, metabolic, or central nervous system disease that, in the opinion of the Investigator, may adversely affect the safety of the subject and/or efficacy of the investigational product or severely limit the lifespan of the subject other than the condition being studied

• Subjects with a prior malignancy whose cancer is expected to require additional active treatment in the next 2 years and whose prior malignancy would prevent them from fully participating in the study

• Female subject who is pregnant or breastfeeding

• Subject has demonstrated noncompliance with previous medical regimens

• Subject has a recent (within 1 year) history of abusing alcohol or illicit drugs

• Subject has participated in a clinical study involving another investigational drug or device within 4 weeks before the Screening Visit.

Contacts and Locations

Locations

	Site	City	State	Country	Postal Code
1	GSK Investigational Site	Boston	Massachusetts	United States	02118
2	GSK Investigational Site	Dallas	Texas	United States	75390-8550
3	GSK Investigational Site	Rosario	Santa Fe	Argentina	S2000ODA
4	GSK Investigational Site	Ciudad Autonoma de Buenos Aires		Argentina	C1181ACH
5	GSK Investigational Site	Corrientes		Argentina	W3400AMZ
6	GSK Investigational Site	Santa Fe		Argentina
7	GSK Investigational Site	Graz		Austria	A-8036
8	GSK Investigational Site	Innsbruck		Austria	A-6020
9	GSK Investigational Site	Vienna		Austria	1090
10	GSK Investigational Site	Edmonton	Alberta	Canada	T6G 2G3
11	GSK Investigational Site	London	Ontario	Canada	N6A 5W9
12	GSK Investigational Site	Wuhan	Hubei	China	430022
13	GSK Investigational Site	Xian	Shaanxi	China	710061
14	GSK Investigational Site	Beijing		China	100020
15	GSK Investigational Site	Beijing		China	100037
16	GSK Investigational Site	Beijing		China	100038
17	GSK Investigational Site	Shanghai		China	200433
18	GSK Investigational Site	Praha 2		Czech Republic	128 08
19	GSK Investigational Site	Heidelberg	Baden-Wuerttemberg	Germany	69126
20	GSK Investigational Site	Regensburg	Bayern	Germany	93053
21	GSK Investigational Site	Wuerzburg	Bayern	Germany	97074
22	GSK Investigational Site	Hannover	Niedersachsen	Germany	30625
23	GSK Investigational Site	Homburg	Saarland	Germany	66421
24	GSK Investigational Site	Dresden	Sachsen	Germany	01307
25	GSK Investigational Site	Leipzig	Sachsen	Germany	04103
26	GSK Investigational Site	Ashkelon		Israel	78360
27	GSK Investigational Site	Zrifin		Israel	70300
28	GSK Investigational Site	Aichi		Japan	466-8560
29	GSK Investigational Site	Fukuoka		Japan	812-8582
30	GSK Investigational Site	Hokkaido		Japan	060-8648
31	GSK Investigational Site	Hyogo		Japan	650-0017
32	GSK Investigational Site	Miyagi		Japan	980-8574
33	GSK Investigational Site	Tochigi		Japan	329-0498
34	GSK Investigational Site	Tokyo		Japan	113-8655
35	GSK Investigational Site	Tokyo		Japan	181-8611
36	GSK Investigational Site	Seoul		Korea, Republic of	110-744
37	GSK Investigational Site	Seoul		Korea, Republic of	120-752
38	GSK Investigational Site	Seoul		Korea, Republic of	135-710
39	GSK Investigational Site	Monterrey NL	Nuevo León	Mexico	64718
40	GSK Investigational Site	Amsterdam		Netherlands	1081 HV
41	GSK Investigational Site	Kemerovo		Russian Federation	650002
42	GSK Investigational Site	Novosibirsk		Russian Federation	630055
43	GSK Investigational Site	Tomsk		Russian Federation	634012
44	GSK Investigational Site	Riyadh		Saudi Arabia
45	GSK Investigational Site	Barcelona		Spain	08036
46	GSK Investigational Site	Madrid		Spain	28041
47	GSK Investigational Site	Majadahonda (Madrid)		Spain	28222
48	GSK Investigational Site	Sevilla		Spain	41013
49	GSK Investigational Site	Cambridge		United Kingdom	CB23 3RE
50	GSK Investigational Site	Clydebank		United Kingdom	G81 4DY
51	GSK Investigational Site	London		United Kingdom	NW3 2QH

Sponsors and Collaborators

• GlaxoSmithKline

Investigators

• Study Director: GSK Clinical Trials, GlaxoSmithKline

Study Documents (Full-Text)

None provided.

More Information

Publications

None provided.

• Responsible Party: GlaxoSmithKline
• ClinicalTrials.gov Identifier: NCT01884675
• Other Study ID Numbers: 115811
• First Posted: Jun 24, 2013
• Last Update Posted: Mar 6, 2017
• Last Verified: Nov 1, 2016

• Keywords provided by GlaxoSmithKline: Endothelin Receptor Antagonist; Inoperable Chronic Thromboembolic Pulmonary Hypertension
• Additional relevant MeSH terms: Hypertension, Pulmonary; Hypertension; Ambrisentan

Study Results

Participant Flow

Recruitment Details	A total of 160 participants were planned to be enrolled, however only 33 participants were randomized in the study.
Pre-assignment Detail	This was a double-blind study which included clinic visits at Screening, Baseline visit, Weeks 4, 8, 12 and 16. A Follow-up visit was scheduled approximately 30 days after the Week 16 visit for those participants not continuing into study AMB116457 (Open-label extension study).

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Period Title: Overall Study
STARTED	16	17
COMPLETED	13	15
NOT COMPLETED	3	2

Baseline Characteristics

Arm/Group Title	Placebo	Ambrisentan 5mg	Total
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.	Total of all reporting groups
Overall Participants	16	17	33
Age (Years) [Median (Inter-Quartile Range) ]
Median (Inter-Quartile Range) [Years]	59.0 (8.99)	63.0 (13.38)	62.0 (11.31)
Sex: Female, Male (Count of Participants)
Female	10 62.5%	8 47.1%	18 54.5%
Male	6 37.5%	9 52.9%	15 45.5%
Race/Ethnicity, Customized (Number) [Number]
Asian - East Asian Heritage	6 37.5%	5 29.4%	11 33.3%
Asian - Japanese Heritage	4 25%	1 5.9%	5 15.2%
White - White/Caucasian/European Heritage	6 37.5%	11 64.7%	17 51.5%

Outcome Measures

1. Primary Outcome

Title	Change From Baseline in Six Minutes Walking Distance (6MWD) at Week 16
Description	The 6-minute walk test was conducted according to the American Thoracic Society guidelines in accordance with local standard operating procedures. 6MWD was measured by a 6-minute walk test. This test measures the distance that a participant can walk in a period of 6 minutes. Change from baseline was calculated at Weeks 4, 8, 12 and 16. Change from Baseline was calculated as value at the specified visit minus the Baseline value. Data at Baseline is based on average of two consecutive test results during Screening/Baseline period that differ by <10%. If only one measurement was available, that measurement was used. In any cases where the protocol-defined criteria for Baseline 6MWD was not met, the Baseline value was based on the last two consecutive measurements for a participant.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Week 4, n=15, 17	5.00	14.00
Week 8, n=14, 16	7.50	26.25
Week 12, n=13, 15	5.50	20.50
Week 16, n=13, 15	-10.00	25.00
Early Withdrawal, n=3, 2	7.50	41.25

2. Secondary Outcome

Title	Change From Baseline in Pulmonary Vascular Resistance (PVR) at Week 16
Description	PVR is a measure of cardiopulmonary haemodynamics. Change from Baseline was calculated as value at specified visit minus Baseline value. Baseline is the last value recorded on or prior to start of study treatment.
Time Frame	Baseline (Week 0) and Week 16

Outcome Measure Data

Analysis Population Description

ITT Population. Only those participants with available data at Baseline and the specified timepoint were analysed.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	11	13
Median (Inter-Quartile Range) [Dynes*second/centimeter^5]	-103.0	-130.0

3. Secondary Outcome

Title	Change From Baseline in WHO Functional Class (FC) at Weeks 4, 8, 12 and 16/Early Withdrawal
Description	The WHO FC indicates the severity of PAH and is an adaptation of the New York Heart Association classification. It was assessed by the investigator. There are four grades for WHO FC based on severity of symptoms (Class I = none, Class IV = most severe). This functional classification system links symptoms with activity limitations, and allows clinicians to quickly predict disease progression and prognosis, as well as the need for specific treatment regimens, irrespective of the underlying etiology of PAH. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the value at specified visit minus the Baseline value. For analyse purposes, the WHO FC Class categories of I-IV were mapped to a numeric scale of 1-4.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Subjects in this arm will receive ambrisentan-matching placebo tablet once daily during the treatment period.
Measure Participants	16	17
Week 4, n=15, 17	0.0	0.0
Week 8, n=14, 16	0.0	0.0
Week 12, n=13, 15	0.0	0.0
Week 16, n=13, 15	0.0	0.0
Early Withdrawal, n=3, 2	0.0	0.0

4. Secondary Outcome

Title	Change From Baseline in Borg CR10 Scale (BCR10S) Immediately Following Exercise at Weeks 4, 8, 12 and 16/Early Withdrawal
Description	The BCR10S score was collected immediately following completion of the 6-minute walk test. Baseline data was calculated as the average of the two BCR10S values obtained following the two 6MWD tests used in determining the Baseline 6MWD. If only one measurement was available, that measurement has been used. BCR10S scores ranges from 0 to 10 (0=nothing at all, 10=extremely strong). If participant's perception or feeling was stronger than "10", i.e "extremely strong", "Maximal" - a larger number could be used, e.g. 12 or still higher i.e "Absolute maximum"). Change from Baseline was calculated as the value at specified visit minus the Baseline value.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Week 4, n=15, 17	0.00	-0.40
Week 8, n=14, 16	0.25	-0.20
Week 12, n=13, 15	0.00	-0.40
Week 16, n=13, 15	1.00	-0.50
Early Withdrawal, n=3, 2	2.00	-0.25

5. Secondary Outcome

Title	Number of Participants With Clinical Worsening of Chronic Thromboembolic Pulmonary Hypertension (CTEPH)
Description	Clinical worsening of CTEPH is defined by the time from randomization to the first occurrence of death, lung transplantation, hospitalization for CTEPH, atrial septostomy, addition of parenteral prostanoids, or study withdrawal due to two or more early escape criteria included: a decrease from Baseline of at least 20 percent in the distance walked during the six-minute walk test; an increase of one or more WHO functional class; worsening right ventricular failure (e.g., as indicated by increased jugular venous pressure; new/worsening hepatomegaly, ascites, or peripheral edema; worsening echocardiographic parameters such as tricuspid annulus plane systolic excursion (TAPSE) and Tissue Doppler Imaging of the tricuspid annulus); rapidly progressing cardiogenic, hepatic, or renal failure; refractory systolic hypotension (systolic blood pressure less than 85 millimeter of mercury [mmHg]).
Time Frame	From randomization to Week 16/Follow up visit (21 weeks)

Outcome Measure Data

Analysis Population Description

ITT Population

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Number [Participants]	0 0%	0 0%

6. Secondary Outcome

Title	Change From Baseline in Mean Right Atrial Pressure (mRAP) and Mean Pulmonary Artery Pressure (mPAP) at Week 16
Description	mPAP and mRAP are measures of cardiopulmonary hemodynamics. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the value at specified visit minus the Baseline value.
Time Frame	Baseline (Week 0) and Week 16

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
mRAP, Week 16, n=11, 13	-2.0	-1.0
mPAP, Week 16, n=11, 12	-6.0	-3.0

7. Secondary Outcome

Title	Change From Baseline in Cardiac Index at Week 16
Description	Cardiac index is measure of cardiopulmonary hemodynamics. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the value at specified visit minus the Baseline value.
Time Frame	Baseline (Week 0) and Week 16

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	11	12
Median (Inter-Quartile Range) [Litre per minute per meter squared]	0.100	0.440

8. Secondary Outcome

Title	Percent Change From Baseline in Plasma N-terminal Pro-B-type Natriuretic Peptide (NT-proBNP)
Description	The ratio to baseline [BL] in NT-proBNP was calculated as the ratio of the value at the specified time-point to the BL value and was expressed as a percent change from BL. For each treatment group, the mean change from BL at the specified time-point was determined on the log scale. This mean was then back transformed to give a geometric mean (GM) of the ratio of the value at the specified time-point to BL on the original scale. The GM was expressed as a percentage (100*[GM - 1]). Standard Deviation(SD) is the SD of the mean change from baseline values on the log scale.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12 and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Week 4, n=13, 15	43.6 (0.41)	-15.8 (0.36)
Week 8, n=13, 15	12.4 (0.49)	-23.3 (0.59)
Week 12, n=12, 14	12.4 (0.59)	-21.9 (0.61)
Week 16, n=12, 14	14.1 (0.55)	-29.4 (0.50)
Early withdrawal, n=3, 2	35.7 (0.69)	-14.9 (0.31)

9. Secondary Outcome

Title	Change From Baseline in Quality of Life as Measured by Short Form 36 Health Survey (SF-36)
Description	The SF-36 v2 is a self-administered, health-related quality of life (QoL) metric. It is a 36-item questionnaire designed to measure 8 domains of functional health status and well-being: physical functioning, role-physical, bodily pain, general health perceptions, vitality, social functioning, role-emotional, and mental health as well as 2 summary measures (Physical Health and Mental Health). Each domain is scored from 0 (poorer health) to 100 (better health). Change from Baseline was calculated as the post-Baseline score minus the Baseline score. The SF-36 data were collected, but after the study was terminated, not all endpoints listed in the protocol were analyzed, including the SF-36. This decision was documented in the reporting and analysis plan prior to database lock.
Time Frame	Baseline and up to Week 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

ITT Population

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	0	0

10. Secondary Outcome

Title	Number of Participants With Any Adverse Events (AEs) and Serious Adverse Events (SAEs)
Description	AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a medicinal product. For marketed medicinal products, this also includes failure to produce expected benefits (i.e., lack of efficacy), abuse or misuse. A SAE is defined as any untoward medical occurrence that, at any dose results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity or is a congenital anomaly/birth defect or important medical events that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed in the above definition.
Time Frame	From the start of study treatment and until follow up (Week 16/Follow up)

Outcome Measure Data

Analysis Population Description

ITT Population

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Any AE	15 93.8%	11 64.7%
Any SAE	1 6.3%	0 0%

11. Secondary Outcome

Title	Change From Baseline in Haemoglobin Levels at Weeks 4, 8, 12, and 16/Early Withdrawal
Description	Haemoglobin levels were assessed at Screening, Baseline, Weeks 4, 8, 12, and 16/Early Withdrawal. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Week 4, n=15, 15	-2.0	-5.0
Week 8, n=13, 16	0.0	-7.5
Week 12, n=13, 14	2.0	-5.0
Week 16, n=13, 15	-3.0	-6.0
Early withdrawal, n=3, 2	-2.0	-14.5

12. Secondary Outcome

Title	Change From Baseline in Haematocrit Levels at Weeks 4, 8, 12, and 16/Early Withdrawal
Description	Haematocrit levels were assessed at Screening, Baseline, Weeks 4, 8, 12, and 16/Early Withdrawal. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Week 4, n=15, 15	0.000	-0.015
Week 8, n=13, 16	-0.003	-0.021
Week 12, n=13, 14	0.007	-0.023
Week 16, n=13, 15	-0.007	-0.019
Early withdrawal, n=3, 2	-0.008	-0.030

13. Secondary Outcome

Title	Number of Participants With Significant Liver Events at Weeks 4, 8, 12, and 16/Early Withdrawal
Description	A significant liver chemistry result is defined as any result which met the stopping criteria defined in the study protocol. Liver events were assessed at Screening, Baseline, Weeks 4, 8, 12, and 16/Early Withdrawal. Number of participants who reported a significant liver chemistry result are presented.
Time Frame	Weeks 4, 8, 12, and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

ITT Population

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Number [Participants]	0 0%	0 0%

14. Secondary Outcome

Title	Change From Baseline in Supine Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) Assessed at Weeks 4, 8, 12, and 16/Early Withdrawal
Description	Vital sign measurements including supine systolic and diastolic blood pressure at Weeks 4, 8, 12, and 16/Early Withdrawal weeks. Supine blood pressure measurement was taken in a supine position having rested in this position for at least 10 minutes before each reading. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
DBP, Week 4, n=15, 17	0.0	-1.0
DBP, Week 8, n=14, 16	1.5	-9.0
DBP, Week 12, n=13, 15	1.0	-8.0
DBP, Week 16, n=13, 15	-2.0	-10.0
DBP, Early Withdrawal, n=3, 2	16.0	-17.0
SBP, Week 4, n=15, 17	0.0	-4.0
SBP, Week 8, n=14, 16	5.5	-10.0
SBP, Week 12, n=13, 15	-2.0	-5.0
SBP, Week 16, n=13, 15	-4.0	-6.0
SBP, Early Withdrawal, n=3, 2	15.0	-8.0

15. Secondary Outcome

Title	Change From Baseline in Heart Rate Assessed at Weeks 4, 8, 12, and 16/Early Withdrawal
Description	Vital sign measurements including heart rate at Weeks 4, 8, 12, and 16/Early Withdrawal weeks. Baseline is the last value recorded on or prior to start of study treatment. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Time Frame	Baseline (Week 0); Weeks 4, 8, 12, and 16/Early Withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Week 4, n=15, 17	0.0	4.0
Week 8, n=14, 16	-8.0	1.0
Week 12, n=13, 15	-2.0	0.0
Week 16, n=13, 15	0.0	-1.0
Early withdrawal, n=3, 2	-6.0	-18.0

16. Secondary Outcome

Title	Number of Participants With Clinical Chemistry Parameters of Potential Clinical Concern Any Time Post Baseline
Description	Clinical chemistry parameters including alanine amino transferase (ALT), aspartate amino transferase (AST), creatinine, gamma glutamyl transferase (GGT) and total bilirubin (TB) assessed any time post Baseline. ALT: lower concern value and high concern value was considered as none and >=3xupper limit of normal (ULN) respectively. AST: lower concern value and high concern value was considered as none or >=3xULN respectively. creatinine: lower concern value and high concern value was considered as none and >=176.8 micromoles per liter (umol/L) respectively. GGT: lower concern value and high concern value was considered as none and >=3xULN respectively. For TB: lower concern value was none and high concern value was >=2xULN. Participants with both normal and low values were counted once under their worst case (Low). Participants with both normal and high values were counted once under their worst case (High). Participants with both high and low values are counted under both categories.
Time Frame	Baseline (Week 0), Weeks 4, 8, 12 and 16/early withdrawal,

Outcome Measure Data

Analysis Population Description

ITT Population

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.c	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
ALT, >clinical concern high	0 0%	0 0%
ALT, <clinical concern low	0 0%	0 0%
AST, >clinical concern high	0 0%	0 0%
AST, <clinical concern low	0 0%	0 0%
Creatinine, >clinical concern high	0 0%	0 0%
Creatinine, <clinical concern low	0 0%	0 0%
GGT, >clinical concern high	1 6.3%	1 5.9%
GGT, <clinical concern low	0 0%	0 0%
TB, >clinical concern high	0 0%	0 0%
TB, <clinical concern low	0 0%	0 0%

17. Secondary Outcome

Title	Number of Participants With Hematology Parameters of Potential Clinical Concern Any Time Post Baseline
Description	Hematology parameters including hemoglobin, international normalized ratio (INR), and platelet count assessed any time post Baseline. Baseline is the last value recorded on or prior to start of study treatment. For hemoglobin: lower concern value and high concern value was considered as <100 gram per liter (G/L) and none respectively. For INR: lower concern value and high concern value was considered as none or >5 prothrombin time respectively. For platelet count: lower concern value and high concern value was considered as <50 giga cells per liter (GI/L) and >500 GI/L respectively. Participants with both normal and low values were counted once under their worst case (Low). Participants with both normal and high values were counted once under their worst case (High). Participants with both high and low values are counted under both categories.
Time Frame	Baseline (Week 0), Weeks 4, 8, 12 and 16/early withdrawal

Outcome Measure Data

Analysis Population Description

Intent-to-Treat (ITT) Population: comprised of all randomized participants who received at least 1 dose of study drug. Only those participants with available data at Baseline and the specified timepoint (represented as n=X, X for placebo and ambrisentan respectively) were summarized.

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	16	17
Hemoglobin, >clinical concern high, n=16, 17	0 0%	0 0%
Hemoglobin, <clinical concern low, n=16, 17	0 0%	0 0%
INR, >clinical concern high, n=2, 0	0 0%	0 0%
INR, <clinical concern low, n=2, 0	0 0%	0 0%
Platelet count, >clinical concern high, n=16, 17	0 0%	0 0%
Platelet count, <clinical concern low, n=16, 17	0 0%	0 0%

18. Secondary Outcome

Title	Number of Participants With Testicular Function (Males Only) of Potential Clinical Concern Any Time Post Baseline
Description	For male participants testicular function (total testosterone, sex hormone binding globulin [SHBG-calculated free testosterone), follicle stimulating hormone (FSH), luteinizing hormone (LH), and inhibin B were assessed at Weeks 4 and 16/early withdrawal. The testicular function data were collected, but after the study was terminated, not all endpoints listed in the protocol were analyzed, including Testicular Function. This decision was documented in the reporting and analysis plan prior to database lock.
Time Frame	Baseline, Weeks 4 and 16/early withdrawal

Outcome Measure Data

Analysis Population Description

ITT Population

Arm/Group Title	Placebo	Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.	Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
Measure Participants	0	0

Adverse Events

Time Frame	Adverse events (AEs) and serious adverse events (SAEs) were collected from the start of study treatment and until the follow up contact (Week 21)
Adverse Event Reporting Description	AEs and SAEs were collected from the members of ITT population which comprised of all randomized participants who received at least 1 dose of study drug.
Arm/Group Title	Placebo		Ambrisentan 5mg
Arm/Group Description	Participants received a matching placebo tablet once daily for a period of 16 weeks.		Participants received an ambrisentan 5milligram (mg) tablet, once daily for a period of 16 weeks.
All Cause Mortality
	Placebo		Ambrisentan 5mg
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	/ (NaN)		/ (NaN)
Serious Adverse Events
	Placebo		Ambrisentan 5mg
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	1/16 (6.3%)		0/17 (0%)
Respiratory, thoracic and mediastinal disorders
Asthma	1/16 (6.3%)		0/17 (0%)
Other (Not Including Serious) Adverse Events
	Placebo		Ambrisentan 5mg
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	15/16 (93.8%)		11/17 (64.7%)
Blood and lymphatic system disorders
Lymphadenopathy	0/16 (0%)		1/17 (5.9%)
Cardiac disorders
Tachycardia	0/16 (0%)		1/17 (5.9%)
Atrial fibrillation	1/16 (6.3%)		0/17 (0%)
Eye disorders
Eyelid oedema	1/16 (6.3%)		1/17 (5.9%)
Gastrointestinal disorders
Abdominal pain upper	0/16 (0%)		1/17 (5.9%)
Constipation	1/16 (6.3%)		1/17 (5.9%)
Cheilitis	1/16 (6.3%)		0/17 (0%)
Dyspepsia	1/16 (6.3%)		0/17 (0%)
Hypoaesthesia oral	1/16 (6.3%)		0/17 (0%)
General disorders
Oedema peripheral	2/16 (12.5%)		3/17 (17.6%)
Feeling abnormal	0/16 (0%)		1/17 (5.9%)
Non-cardiac chest pain	0/16 (0%)		1/17 (5.9%)
Chest discomfort	1/16 (6.3%)		0/17 (0%)
Infections and infestations
Erysipelas	0/16 (0%)		1/17 (5.9%)
Nasopharyngitis	0/16 (0%)		1/17 (5.9%)
Onychomycosis	0/16 (0%)		1/17 (5.9%)
Viral upper respiratory tract infection	0/16 (0%)		1/17 (5.9%)
Bronchitis	1/16 (6.3%)		0/17 (0%)
Influenza	1/16 (6.3%)		0/17 (0%)
Upper respiratory tract infection	2/16 (12.5%)		0/17 (0%)
Injury, poisoning and procedural complications
Joint dislocation	1/16 (6.3%)		0/17 (0%)
Thermal burn	1/16 (6.3%)		0/17 (0%)
Investigations
Weight increased	1/16 (6.3%)		0/17 (0%)
Metabolism and nutrition disorders
Hyperglycaemia	1/16 (6.3%)		0/17 (0%)
Musculoskeletal and connective tissue disorders
Neck pain	2/16 (12.5%)		0/17 (0%)
Neoplasms benign, malignant and unspecified (incl cysts and polyps)
Fibroma	0/16 (0%)		1/17 (5.9%)
Nervous system disorders
Headache	3/16 (18.8%)		2/17 (11.8%)
Dizziness	1/16 (6.3%)		1/17 (5.9%)
Hypoaesthesia	1/16 (6.3%)		0/17 (0%)
Movement disorder	1/16 (6.3%)		0/17 (0%)
Reproductive system and breast disorders
Nipple pain	0/16 (0%)		1/17 (5.9%)
Respiratory, thoracic and mediastinal disorders
Epistaxis	1/16 (6.3%)		1/17 (5.9%)
Haemoptysis	3/16 (18.8%)		0/17 (0%)
Pleurisy	1/16 (6.3%)		0/17 (0%)
Productive cough	1/16 (6.3%)		0/17 (0%)
Skin and subcutaneous tissue disorders
Rash	1/16 (6.3%)		0/17 (0%)
Vascular disorders
Hypertension	0/16 (0%)		1/17 (5.9%)
Peripheral venous disease	0/16 (0%)		1/17 (5.9%)

Limitations/Caveats

[Not Specified]

More Information

Certain Agreements

Principal Investigators are NOT employed by the organization sponsoring the study.

GSK agreements may vary with individual investigators, but will not prohibit any investigator from publishing. GSK supports the publication of results from all centers of a multi-center trial but requests that reports based on single-site data not precede the primary publication of the entire clinical trial.