GSK1325760A

The 6MWT measures the distance that a participant can walk in a period of 6 minutes. Change from Baseline was calculated as the Week 12 value minus the Baseline value. Baseline 6MWT comprised of an average of the last two consecutive measurements prior to dosing that varied by not greater than 10 percent (%). If only one measurement was available, that measurement was used as the Baseline value. The last observation carried forward method was used to impute missing values.

Time to the first adjudicated CF event (death, hospitalization for worsening pulmonary arterial hypertension \[PAH\], disease progression, or unsatisfactory long-term clinical response) after initiating either first-line combination therapy with AMB and TAD or first-line monotherapy with either drug (AMB or TAD) in par. with PAH was assessed. If data was not available for some par. following a loss to follow-up, their event times were treated as censored at their last assessment time for the statistical analyses. FAV occurred approximately 4 weeks after the predicted 105th adjudicated first CF event was reached. Par. who had an FAV, and who had no adjudicated events or whose first adjudicated event occurred after their FAV, were censored at their individual FAV. Modified Intent-to-Treat (mITT) Population: all randomized par. who met the PAH diagnosis and inclusion/exclusion criteria defined in protocol amendment 2 and who also received at least one dose of investigational product (IP).

An adverse event was defined as any untoward medical occurrence in a participant, temporally associated with the use of an investigational product, whether or not considered related to the investigational product.

The severity of adverse events was assessed by the investigator; events were assigned to one of the following categories: mild, an event that was easily tolerated by the participant, causing minimal discomfort and not interfering with everyday activities; moderate, an event that was sufficiently discomforting to interfere with normal everyday activities; and severe, an event that prevented normal everyday activities.

Determine whether mean pulmonary arterial pressure of SSc patients with borderline - PAH (mPAP 21 24 mmHg, TPG \>11 mmHg) can be reduced by 3 mm Hg (absolute change baseline vs. 6 months; equals 15%) following treatment with ambrisentan 10 mg/die (initiated with 5 mg/die and elevated up to 10 mg/die) over 6 months (primary endpoint) compared to baseline and placebo.

AE was defined as any untoward medical occurrence in participant or clinical investigation participant,temporally associated with use of medicinal product, whether or not considered related to medicinal product.SAE was 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 or incapacity,or is congenital anomaly or birth defect, important medical events that may not immediately life threatening or result in death or hospitalization but may jeopardize participant or may require medical or surgical intervention as per medical or scientific judgement or associated with drug-induced liver injury.TEAE is any event that was not present prior to initiation of study treatment or any event already present that worsens in either intensity or frequency following exposure to study treatment. TEAEs which were not serious TEAEs were considered as non serious TEAEs.

Blood samples were collected from participants for analysis of following clinical chemistry parameters: ALT, AST, GGT, total bilirubin. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following clinical chemistry parameters: Calcium, chloride, CO2 content, glucose, potassium, magnesium, sodium, phosphorus inorganic, and BUN. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following clinical chemistry parameters: ALP, CK, LDH. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following clinical chemistry parameters: Creatinine, uric acid. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following clinical chemistry parameters: Albumin, total protein. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following hematology parameters: Hemoglobin and MCHC. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following hematology parameters: Hematocrit. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following hematology parameters: Basophils, eosinophils, lymphocytes, monocytes, total neutrophils, WBC, platelet count. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following hematology parameter: Mean Corpuscle Hemoglobin. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following hematology parameter: Mean Corpuscle Volume. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Blood samples were collected from participants for analysis of following hematology parameters: Red Blood Cell count, reticulocytes. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Physical examination included measurement of liver size. Any abnormal enlargement or reduction in the size of the liver is reported. Liver size was assessed as normal or abnormal. Data for abnormal (improved, worsened and unchanged) liver size is presented. End of study visit data is presented.

Physical examination included measurement of Jugular venous pressure. Jugular venous pressure was assessed as normal or abnormal. Data for abnormal (improved, worsened and unchanged) jugular venous pressure is presented. End of study visit data is presented.

Physical examination included measurement of ascites. Ascites were assessed as present or absent. Data for ascites present with improved, worsened and unchanged is presented. End of study visit data is presented.

Physical examination included measurement of peripheral edema. Peripheral edema were assessed as present or absent. Data for peripheral edema present with improved, worsened and unchanged is presented. End of study visit data is presented.

Physical examination included measurement of saturated oxygen. End of study visit data is presented.

SBP and DBP was measured for the participants at indicated time points. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Heart rate was measured for the participants at indicated time points. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Weight was measured for the participants at indicated time points. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Height was measured for the participants at indicated time points. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Body mass index was measured for the participants at indicated time points. Body mass index was calculated as weight in kilograms (kg) divided by the square of their height in meters (m\^2). Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Body surface area was measured for the participants at indicated time points. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

12-lead ECG was measured in a semi-supine position using an automated ECG machine. Abnormal findings were categorized as clinically significant (CS) and not clinically significant (NCS). Data for any time till end of study were presented.

FSH and LH level of participants were measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

FSH and LH level of participants were measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Inhibin B level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Inhibin B level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Sex hormone binding globulin level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Sex hormone binding globulin level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Estrone level of female participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Estrone level of female participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Estriol level of female participants will be measured. Only those parameters having status as overall will be presented. Baseline is the last value recorded prior to start of study treatment from AMB112529. Change from Baseline is calculated by subtracting the Baseline value from the end of study post-dose visit value. Data for this endpoint will be available for this endpoint by June 2023

Estriol level of female participants will be measured. Only those parameters having status as overall will be presented. Baseline is the last value recorded prior to start of study treatment from AMB112529.Change from Baseline is calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants. Data for this endpoint will be available for this endpoint by June 2023

Estradiol level of female participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Estradiol level of female participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

FSH and LH level of participants were measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

FSH and LH level of participants were measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Inhibin B level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Inhibin B level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Sex hormone binding globulin level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Sex hormone binding globulin level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Total Testosterone level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value.

Total Testosterone level of participants was measured. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants.

Testicular volume was assessed by Prader's orchiodometer and the assessment was performed by a pediatric endocrinologist using the Tanner's criteria. Only those parameters having status - overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529. Change from Baseline was calculated by subtracting the Baseline value from the end of study post-dose visit value. Data reported for left and right testicular volume.

Testicular volume was assessed by Prader's orchiodometer and the assessment was performed by a pediatric endocrinologist using the Tanner's criteria. Only those parameters having status as overall were presented. Baseline was the last value recorded prior to start of study treatment from AMB112529.Change from Baseline was calculated by subtracting the Baseline value from the specified time point value. Only participants with data at 20 year visit is presented. When participants reached pubertal maturity prior to being 20 years of age then these tests were not repeated at 20-years of age of participants. Data reported for left and right testicular volume.

Time to change in dose of ambrisentan or other targeted PAH therapeutic agents (prostanoids, Phosphodiesterase type 5 \[PDE-5\] inhibitors) due to tolerability issues was defined as the time from randomization to the first occurrence of a dose change due to tolerability issues.

Mean change from baseline was calculated as the Week 12 value minus the baseline value. 6MWD was measured by a 6 minute walk test. This test measures the distance that a subject can walk in a period of 6 minutes.