A Study to Evaluate the Efficacy and Safety of GSK3915393 in Participants With Idiopathic Pulmonary Fibrosis (IPF)

FVC is defined as the amount of air that can be forcibly exhaled from the lungs after taking the deepest breath possible. It was measured by spirometry test. The maximum of triplicate FVC for each participant, at each timepoint was used for calculations. Baseline was defined as the last non-missing value/assessment prior to the first dose of study treatment on Day 1. Change from Baseline was calculated as the value at indicated time point minus the value at Baseline. Posterior median CFB and the 95% HPD interval were derived using a Bayesian repeated measures model. The data presented as "Median" refers to the 'posterior median' and "95% confidence interval" to '95% HPD interval'.

FVC is defined as the amount of air that can be forcibly exhaled from the lungs after taking the deepest breath possible. It was measured by spirometry test. The maximum of triplicate FVC for each participant, at each timepoint was used for calculations. The FVC (percentage [%] predicted) result at each timepoint for each participant is calculated using the formula: FVC (% predicted) equals to FVC (mL) divided by Predicted FVC (mL) multiply by 100. Baseline was defined as the last non-missing value/assessment prior to the first dose of study treatment on Day 1. Change from Baseline in FVC (% predicted) at each time point for each participant was calculated by subtracting the Baseline FVC (% predicted) from the FVC (% predicted) at that timepoint.

FVC is defined as the amount of air that can be forcibly exhaled from the lungs after taking the deepest breath possible. It was measured by spirometry test. Baseline was defined as the last non-missing value/assessment prior to the first dose of study treatment on Day 1. Relative decline from Baseline in FVC (mL) at the Week 26 visit was calculated using the following formula: relative decline at Week 26 equals to (1 minus Week 26 FVC [mL] divided by Baseline FVC [mL]) multiplied by 100. Participants with relative decline of <=5% at Week 26 were classified as responders; those with greater than (>) 5% decline were non-responders. Participants who died due to disease progression prior to Week 26 were imputed as non-responders. Posterior median and the 95% HPD interval were derived using a Bayesian logistic regression model. The data presented as "Median" refers to the 'posterior median' and "95% confidence interval" to '95% HPD interval'.

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention. An SAE is any untoward medical occurrence that, at any dose: results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study participant or any other situation according to medical or scientific judgment.

Vital signs included systolic blood pressure (SBP), diastolic blood pressure (DBP), and pulse rate were measured for at least 5 minutes of rest for the participant in a quiet setting. PCI ranges were SBP (low: less than [<]85 millimeter of mercury [mmHg], high: >180 mmHg), DBP (low: <45 mmHg, high: >110 mmHg) and pulse rate (low: <40 beat per minute [bpm], high: >110 bpm). Participants were counted in the worst-case category if their value changed 'To Low' or 'To High', unless there was no change in their category. Participants whose vital signs value category was unchanged (e.g., High to High), or whose value became within range, were recorded in 'To Within Range or No Change' category. Participants were counted twice if the participants had values that changed 'To Low' and 'To High', so the percentages may not add to 100%.

Triplicate 12-lead ECGs were obtained after participant has rested in supine position for 5 minutes, using an ECG machine that automatically calculates heart rate and measures PR, QRS, QT, and QTc intervals. ECG parameters with PCI ranges were: PR Interval (low: <110 milliseconds[msec], high: >220 msec), QRS Duration (low: <75 msec, high: >120 msec) and QTcF Interval (<=450 msec, >450 msec to <=480 msec, >480 msec to <=500 msec and >500 msec). Participants were counted in the worst-case category if their value changed 'To Low' or 'To High', unless there was no change in their category. Participants whose value category was unchanged (e.g., High to High), or whose value became within range, were recorded in 'To Within Range or No Change' category. Participants were counted twice if the participants had values that changed 'To Low' and 'To High', so the percentages may not add to 100%.

Hematology parameters with PCI ranges were: hematocrit (low: <0.1 percentage of red blood cells in blood, high: >0.54 percentage of red blood cells in blood), lymphocytes (low: <0.8*giga cells per liter [10^9/L]), neutrophil count (low: <1.5*10^9/L), platelet count (low: <100*10^9/L and high: >800*10^9/L), and white blood cell (WBC) (low: <2*10^9/L and high: >25*10^9/L). Participants were counted in the worst-case category if their value changed 'To Low' or 'To High', unless there was no change in their category. Participants whose value category was unchanged (e.g., High to High), or whose value became within range, were recorded in 'To Within Range or No Change' category. Participants were counted twice if the participants had values that changed 'To Low' and 'To High', so the percentages may not add to 100%.

Hepatobiliary parameters with PCI ranges were: Alanine transaminase (ALT) (high: greater than or equal to [>=] 3*upper limit of normal [ULN]), Aspartate aminotransferase (AST) (high: >=3*ULN), Alkaline phosphatase (ALP) (high: >=2*ULN) and total bilirubin (high: >=2*ULN). Participants were counted in the worst-case category if their value changed 'To Low' or 'To High', unless there was no change in their category. Participants whose value category was unchanged (e.g., High to High), or whose value became within range, were recorded in 'To Within Range or No Change' category. Participants were counted twice if the participants had values that changed 'To Low' and 'To High', so the percentages may not add to 100%.

Clinical chemistry parameters with PCI ranges were: glucose (low: <2 millimoles per liter[mmol/L], high: >25 mmol/L), albumin (low: <30 grams per liter[g/L]), creatine phosphokinase (CPK) (high: >1500 international units per liter [IU/L]), potassium (low: <3 mmol/L, high: >6.0 mmol/L), sodium (low: <130 mmol/L, high: >155 mmol/L), blood urea nitrogen (BUN) (high: >14 mmol/L) and calcium corrected for albumin (low: <1.9 mmol/L, high: >3 mmol/L). Participants were counted in the worst-case category if their value changed 'To Low' or 'To High', unless there was no change in their category. Participants whose value category was unchanged (e.g., High to High), or whose value became within range, were recorded in 'To Within Range or No Change' category. Participants were counted twice if the participants had values that changed 'To Low' and 'To High', so the percentages may not add to 100%.

Blood samples were collected at the indicated nominal time points for pharmacokinetic (PK) analysis of GSK3915393.

Blood samples were collected at the indicated nominal time points for pharmacokinetic analysis of GSK3915393.

Blood samples were collected at the indicated nominal time points for pharmacokinetic analysis of GSK3915393.