CClinicalTrials.gg
TerminatedNCT06317285Updated Sep 18, 2026Results posted

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

A Phase 2 interventional study of GSK3915393 and Placebo in Idiopathic Pulmonary Fibrosis, sponsored by GlaxoSmithKline. Terminated at 56 sites in 10 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-09-18.

Sponsored by GlaxoSmithKline · Phase 2, Interventional, and Treatment

Why this study was terminated
The study met futility criteria at pre-planned interim analysis, showing no clinical efficacy of the investigational drug. Based on the lack of efficacy at the interim data review, the sponsor decided to terminate the study.
Phase
Phase 2
Study type
Interventional
Enrollment
158
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

Idiopathic Pulmonary Fibrosis is a chronic lung disease which causes scarring of the lungs and difficulty in breathing. GSK3915393 is a new medicine, which is being tested in participants with IPF for the first time. The study will assess the safety and effectiveness of GSK3915393 in IPF participants.

02

Conditions studied

  • Idiopathic Pulmonary Fibrosis

Keywords

  • GSK3915393
  • Idiopathic Pulmonary Fibrosis
  • Efficacy
  • Safety
  • Forced vital capacity
  • Tolerability
03

In context

Idiopathic Pulmonary Fibrosis

551 studies on the registry are indexed under Idiopathic Pulmonary Fibrosis; 117 are open to participants now.

This study's enrollment of 158 is above the median of 54 across 376 interventional studies indexed under Idiopathic Pulmonary Fibrosis.

Browse Idiopathic Pulmonary Fibrosis studies →

Lead sponsor

GlaxoSmithKline is the lead sponsor of 3,562 studies on the registry; 117 are open to participants now.

Of its 258 completed or terminated interventional studies of FDA-regulated products, 232 (90%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Participants with IPF diagnosed within 5 years prior to screening based on the applicable American Thoracic Society (ATS)/ European Respiratory Society (ERS)/ Japanese Respiratory Society (JRS)/ Latin American Thoracic Society (ALAT) Guideline at the time of diagnosis.
  • Centrally read chest High Resolution Computed Tomography (HRCT) obtained at screening or historical HRCT obtained within 12 months of screening that is consistent with Usual interstitial pneumonia (UIP) or probable UIP (if indeterminate HRCT finding, IPF may be confirmed locally by historical biopsy).
  • FVC greater than or equal to (>=) 45 percent (%) of predicted normal.
  • Diffusing Capacity (of Lung) for Carbon Monoxide (DLCO) >=25% of predicted normal corrected for hemoglobin (Hb).
  • Prebronchodilator Forced Expiratory Volume in 1 second (FEV1)/FVC >=0.7.
  • If receiving antifibrotics must be on stable dose of nintedanib or pirfenidone for at least 12 weeks prior to screening.
  • If not receiving approved antifibrotics (pirfenidone or nintedanib) there should be a valid reason for this, such as previous failure, contraindications, failure to meet national or regional eligibility criteria for anti-fibrotic treatment, or participant choice.
  • If not currently receiving pirfenidone or nintedanib, participant must have stopped pirfenidone or nintedanib for at least 4 weeks prior to screening.
  • Body weight >=40 kilogram (kg) and body mass index within the range 18.5-35 kilogram per meter square (kg/m\^2) (inclusive).
  • A female participant is eligible to participate if a woman of nonchildbearing potential (WONCBP)
  • Capable of giving signed informed consent

Exclusion criteria

Exclusion Criteria:

  • Participants with Interstitial Lung Disease (ILD) associated with other known causes.
  • Diagnosis of sarcoidosis or any systemic autoimmune disease (including but not limited to scleroderma, polymyositis/dermatomyositis, systemic lupus erythematosus and rheumatoid arthritis).
  • Acute IPF exacerbation within 6 months prior to screening and/or during the screening period (investigator-determined).
  • Clinically significant non-parenchymal lung disease (e.g., asthma, chronic obstructive pulmonary disease, cavitary or pleural diseases) at screening.
  • Diagnosis of severe pulmonary hypertension (investigator-determined)
  • Extent of emphysema is greater than the extent of fibrosis according to reported results from the most recent HRCT.
  • History of previous lung transplant or recent major surgery (investigator-determined) within 12 weeks prior to screening or planned during the trial period. Registration on a transplant waiting list is allowed.
  • Clinically significant respiratory tract infection (e.g., active tuberculosis, infectious pneumonia, Corona virus disease 2019 [COVID-19]) requiring treatment within 4 weeks prior to and/or during the screening period.
  • Cigarette smoking (including e-cigarettes) either current or within 3 months before screening.
  • Current or chronic liver disease or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).
  • Alanine transaminase (ALT), Aspartate transaminase (AST), Alkaline phosphatase (ALP) greater than (>) 2x Upper Limit of Normal (ULN) and bilirubin >1.5x ULN (isolated bilirubin >1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin less than (\<) 35% at screening).
  • Clinically significant abnormalities detected on ECG of either rhythm or conduction, a Corrected QT interval (QTc) >450 millisecond (msec) or QTc > 480msec for participants with a bundle branch block and/or a pacemaker who are actively ventricularly pacing during the screening ECG.
  • Participants with pacemakers who are not pacing at the time of the screening ECG should have a non-paced QTc \<450 msec.

Prior/Concomitant Therapy-

  • Simultaneous use of pirfenidone and nintedanib at screening.
  • Received systemic corticosteroids equivalent to prednisone >10 milligrams/day or equivalent within 2 weeks of screening period.
  • Use of any of the following therapies within 4 weeks prior to screening and during the screening period or planned during the study:
  • Immunomodulatory therapies, including but not limited to azathioprine, mycophenolate mofetil, methotrexate, tacrolimus, cyclophosphamide, imatinib, Tumour Necrosis Factor -Alpha (TNF- α) inhibitors.
  • Medications that are under investigation for the treatment of IPF including inhaled treprostinil and Phosphodiesterase-4 (PDE-4) inhibitors. Symptomatic cough therapies are allowed.
  • Current use of systemic strong and moderate inducers or inhibitors of Cytochrome P450 3A4 (CYP3A4) that cannot be safely discontinued or switched to an alternative agent at least 14 days before randomization.
  • Current use of systemic CYP3A4 substrates that have a narrow therapeutic index that cannot be safely discontinued or switched to an alternative agent at least 14 days before randomization.
05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
158 participants (actual)

Study arms

  • Experimental
    GSK3915393

    Participants received GSK3915393 80 milligrams (mg), orally, twice daily for 26 weeks.

    Drug: GSK3915393

  • Placebo comparator
    Placebo

    Participants received matching placebo, orally, twice daily for 26 weeks.

    Drug: Placebo

Interventions

  • DrugGSK3915393

    GSK3915393 was administered.

  • DrugPlacebo

    Placebo was administered.

06

What researchers measure

Primary outcomes

  1. Absolute Change From Baseline in Forced Vital Capacity (FVC) at Week 26

    Forced vital capacity (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 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 (CFB) in FVC at Week 26 was calculated for each participant using the FVC Week 26 result minus the Baseline FVC result. Posterior median CFB and the 95% highest posterior density (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'.

    Time frame: Baseline (Day 1) and Week 26

Secondary outcomes

  1. Absolute Change From Baseline in Forced Vital Capacity at Weeks 4, 8, 12 and 18

    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'.

    Time frame: Baseline (Day 1) and Weeks 4, 8, 12 and 18

  2. Absolute Change From Baseline in FVC (Percentage [%] Predicted) at Weeks 4, 8, 12, 18 and 26

    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.

    Time frame: Baseline (Day 1) and Weeks 4, 8, 12, 18 and 26

  3. Proportion of Participants Who Achieved Relative Decline of Less Than or Equal to (<=) 5% in FVC From Baseline at Week 26

    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'.

    Time frame: Baseline (Day 1) and Week 26

  4. Number of Participants With Any Adverse Events (AEs) and Serious Adverse Events (SAEs)

    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.

    Time frame: Up to Week 29

  5. Number of Participants With Vital Signs Results by Potential Clinical Importance (PCI) Criteria

    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%.

    Time frame: Up to Week 29

  6. Number of Participants With Electrocardiogram (ECG) Results by PCI Criteria

    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%.

    Time frame: Up to Week 29

  7. Number of Participants With Hematology Laboratory Results by PCI Criteria

    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%.

    Time frame: Up to week 29

  8. Number of Participants With Hepatobiliary Laboratory Results by PCI Criteria

    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%.

    Time frame: Up to week 29

  9. Number of Participants With Clinical Chemistry Laboratory Results by PCI Criteria

    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%.

    Time frame: Up to Week 29

  10. Maximum Observed Plasma Concentration (Cmax) of GSK3915393

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

    Time frame: Pre-dose, 0.5, 1, 1.5, 2, 3, and 4 hours post-dose at Week 2

  11. Area Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to 4 Hours (AUC [0-4]) of GSK3915393

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

    Time frame: Pre-dose, 0.5, 1, 1.5, 2, 3, and 4 hours post-dose at Week 2

  12. Area Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to Infinity (AUC [0-inf]) of GSK3915393

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

    Time frame: Pre-dose, 0.5, 1, 1.5, 2, 3, and 4 hours post-dose at Week 2

07

Results

Posted Sep 18, 2026

Participant flow

This was a placebo-controlled study to evaluate the efficacy and safety of GSK3915393 in participants with Idiopathic Pulmonary Fibrosis (IPF). This study was terminated after meeting the pre-defined futility criteria for efficacy.

Participant flow — Overall Study
MilestoneGSK3915393Placebo
Started10652
Pharmacokinetic (pk) analysis set200
Completed5023
Not completed5629
Withdrew: Adverse event21
Withdrew: Death10
Withdrew: Lost to follow-up10
Withdrew: Protocol violation21
Withdrew: Physician decision10
Withdrew: Withdrawal by subject43
Withdrew: Study terminated by sponsor4523
Withdrew: Other01

Outcome measures

PrimaryAbsolute Change From Baseline in Forced Vital Capacity (FVC) at Week 26

Forced vital capacity (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 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 (CFB) in FVC at Week 26 was calculated for each participant using the FVC Week 26 result minus the Baseline FVC result. Posterior median CFB and the 95% highest posterior density (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'.

Time frame:
Baseline (Day 1) and Week 26
Reported as:
Median · Milliliters (mL)
Absolute Change From Baseline in Forced Vital Capacity (FVC) at Week 26
Milliliters (mL)GSK3915393Placebo
Absolute Change From Baseline in Forced Vital Capacity (FVC) at Week 26-110.3 (-156.0 to -62.9)-79.0 (-125.5 to -10.2)
Statistical analysis
  • GSK3915393 vs Placebo · Posterior median difference: -33.0 · 95% CI -112.7 to 39.5Posterior median difference with 95% HPD interval is reported using Bayesian repeated measures model.
SecondaryAbsolute Change From Baseline in Forced Vital Capacity at Weeks 4, 8, 12 and 18

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'.

Time frame:
Baseline (Day 1) and Weeks 4, 8, 12 and 18
Reported as:
Median · Milliliters (mL)
Absolute Change From Baseline in Forced Vital Capacity at Weeks 4, 8, 12 and 18
Milliliters (mL)GSK3915393Placebo
Week 414.2 (-17.6 to 47.2)-71.3 (-118.8 to -26.2)
Week 85.6 (-23.6 to 36.6)-70.6 (-110.7 to -28.8)
Week 12-28.9 (-60.0 to 4.6)-67.2 (-111.3 to -24.5)
Week 18-53.4 (-97.5 to -10.1)-78.3 (-134.4 to -17.0)
Statistical analysis
  • GSK3915393 vs Placebo · Posterior median difference: 85.5 · 95% CI 28.7 to 142.0Posterior median difference with 95% HPD interval is reported using Bayesian repeated measures model.
  • GSK3915393 vs Placebo · Posterior median difference: 76.0 · 95% CI 24.2 to 126.7Posterior median difference with 95% HPD interval is reported using Bayesian repeated measures model.
  • GSK3915393 vs Placebo · Posterior median difference: 38.3 · 95% CI -15.3 to 95.4Posterior median difference with 95% HPD interval is reported using Bayesian repeated measures model.
  • GSK3915393 vs Placebo · Posterior median difference: 24.4 · 95% CI -50.4 to 97.5Posterior median difference with 95% HPD interval is reported using Bayesian repeated measures model.
SecondaryAbsolute Change From Baseline in FVC (Percentage [%] Predicted) at Weeks 4, 8, 12, 18 and 26

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.

Time frame:
Baseline (Day 1) and Weeks 4, 8, 12, 18 and 26
Reported as:
Median · Percentage of Predicted FVC
Absolute Change From Baseline in FVC (Percentage [%] Predicted) at Weeks 4, 8, 12, 18 and 26
Percentage of Predicted FVCGSK3915393Placebo
Week 40.15 (-11.9 to 13.0)-0.70 (-18.0 to 21.3)
Week 8-0.15 (-5.5 to 14.3)-1.10 (-10.0 to 21.5)
Week 12-0.70 (-11.1 to 11.2)-0.45 (-10.5 to 25.7)
Week 18-1.90 (-21.2 to 22.6)0.25 (-13.2 to 10.0)
Week 26-3.20 (-26.0 to 11.5)-0.25 (-8.0 to 18.4)
SecondaryProportion of Participants Who Achieved Relative Decline of Less Than or Equal to (<=) 5% in FVC From Baseline at Week 26

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'.

Time frame:
Baseline (Day 1) and Week 26
Reported as:
Median · Proportion of participants
Proportion of Participants Who Achieved Relative Decline of Less Than or Equal to (<=) 5% in FVC From Baseline at Week 26
Proportion of participantsGSK3915393Placebo
Proportion of Participants Who Achieved Relative Decline of Less Than or Equal to (<=) 5% in FVC From Baseline at Week 260.60 (0.46 to 0.73)0.79 (0.62 to 0.93)
Statistical analysis
  • GSK3915393 vs Placebo · Posterior median odds ratio: 0.40 · 95% CI 0.06 to 1.00Posterior median of the odds ratio of achieving relative decline of \<=5% with 95% HPD interval is reported using Bayesian logistic regression model.
SecondaryNumber of Participants With Any Adverse Events (AEs) and Serious Adverse Events (SAEs)

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.

Time frame:
Up to Week 29
Reported as:
Count of participants · Participants
Number of Participants With Any Adverse Events (AEs) and Serious Adverse Events (SAEs)
ParticipantsGSK3915393Placebo
Any AEs6435
Any SAEs131
SecondaryNumber of Participants With Vital Signs Results by Potential Clinical Importance (PCI) Criteria

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%.

Time frame:
Up to Week 29
Reported as:
Count of participants · Participants
Number of Participants With Vital Signs Results by Potential Clinical Importance (PCI) Criteria
ParticipantsGSK3915393Placebo
SBP, To Low10
SBP, To Within Range or No Change10151
SBP, To High21
DBP, To Low10
DBP, To Within Range or No Change10252
DBP, To High10
Pulse rate, To Low00
Pulse rate, To Within Range or No Change10251
Pulse rate, To High21
SecondaryNumber of Participants With Electrocardiogram (ECG) Results by PCI Criteria

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%.

Time frame:
Up to Week 29
Reported as:
Count of participants · Participants
Number of Participants With Electrocardiogram (ECG) Results by PCI Criteria
ParticipantsGSK3915393Placebo
PR Interval, To Low22
PR Interval, To Within Range or No Change9647
PR Interval, To High24
QRS Duration, To Low61
QRS Duration, To Within Range or No Change9348
QRS Duration, To High63
QTcF Interval, No Change or <=450msec9144
QTcF Interval, To >450 msec to <=480 msec64
QTcF Interval, To >480 msec to <=500 msec30
QTcF Interval, To >500 msec00
SecondaryNumber of Participants With Hematology Laboratory Results by PCI Criteria

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%.

Time frame:
Up to week 29
Reported as:
Count of participants · Participants
Number of Participants With Hematology Laboratory Results by PCI Criteria
ParticipantsGSK3915393Placebo
Hematocrit, To Low00
Hematocrit, To Within Range or No Change10052
Hematocrit, To High40
Lymphocytes, To Low72
Lymphocytes, To Within Range or No Change9749
Lymphocytes, To High00
Neutrophils, To Low00
Neutrophils, To Within Range or No Change10451
Neutrophils, To High00
Platelets, To Low10
Platelets, To Within Range or No Change10252
Platelets, To High00
WBC, To Low00
WBC, To Within Range or No Change10452
WBC, To High00
SecondaryNumber of Participants With Hepatobiliary Laboratory Results by PCI Criteria

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%.

Time frame:
Up to week 29
Reported as:
Count of participants · Participants
Number of Participants With Hepatobiliary Laboratory Results by PCI Criteria
ParticipantsGSK3915393Placebo
ALT, To Low00
ALT, To Within Range or No Change10352
ALT, To High10
AST, To Low00
AST, To Within Range or No Change10352
AST, To High10
ALP, To Low00
ALP, To Within Range or No Change10351
ALP, To High10
Total bilirubin, To Low00
Total bilirubin, To Within Range or No Change10452
Total bilirubin, To High00
SecondaryNumber of Participants With Clinical Chemistry Laboratory Results by PCI Criteria

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%.

Time frame:
Up to Week 29
Reported as:
Count of participants · Participants
Number of Participants With Clinical Chemistry Laboratory Results by PCI Criteria
ParticipantsGSK3915393Placebo
Glucose, To Low00
Glucose, To Within Range or No Change10452
Glucose, To High00
Albumin, To Low00
Albumin, To Within Range or No Change10452
Albumin, To High00
CPK, To Low00
CPK, To Within Range or No Change10452
CPK, To High00
Potassium, To Low00
Potassium, To Within Range or No Change10450
Potassium, To High02
Sodium, To Low01
Sodium, To Within Range or No Change10451
Sodium, To High00
BUN, To Low00
BUN, To Within Range or No Change10452
BUN, To High00
Calcium corrected for albumin, To Low20
Calcium corrected for albumin, To Within Range or No Change10252
Calcium corrected for albumin, To High00
SecondaryMaximum Observed Plasma Concentration (Cmax) of GSK3915393

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

Time frame:
Pre-dose, 0.5, 1, 1.5, 2, 3, and 4 hours post-dose at Week 2
Reported as:
Geometric mean · Nanograms per milliliters (ng/mL)
Maximum Observed Plasma Concentration (Cmax) of GSK3915393
Nanograms per milliliters (ng/mL)GSK3915393
Maximum Observed Plasma Concentration (Cmax) of GSK3915393683.87 ± 157.80
SecondaryArea Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to 4 Hours (AUC [0-4]) of GSK3915393

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

Time frame:
Pre-dose, 0.5, 1, 1.5, 2, 3, and 4 hours post-dose at Week 2
Reported as:
Geometric mean · Hours*nanogram per milliliter (h*ng/mL)
Area Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to 4 Hours (AUC [0-4]) of GSK3915393
Hours*nanogram per milliliter (h*ng/mL)GSK3915393
Area Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to 4 Hours (AUC [0-4]) of GSK39153931337.15 ± 64.70
SecondaryArea Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to Infinity (AUC [0-inf]) of GSK3915393

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

Time frame:
Pre-dose, 0.5, 1, 1.5, 2, 3, and 4 hours post-dose at Week 2
Reported as:
Geometric mean · Hours*nanogram per milliliter (h*ng/mL)
Area Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to Infinity (AUC [0-inf]) of GSK3915393
Hours*nanogram per milliliter (h*ng/mL)GSK3915393
Area Under the Plasma-concentration Time Curve From Time Zero (Pre-dose) to Infinity (AUC [0-inf]) of GSK3915393NA ± NA

Adverse events

Collected over All-cause mortality, serious adverse events (SAEs) and non-serious adverse events (non-SAEs) were collected up to week 29. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
GSK39153931/106 (0.9%)13/106 (12.3%)15/106 (14.2%)
Placebo0/52 (0%)1/52 (1.9%)17/52 (32.7%)
Most frequent serious events
Showing 10 of 11
Most frequent serious events
EventGSK3915393Placebo
PneumoniaInfections and infestations3/1060/52
Prostate cancer metastaticNeoplasms benign, malignant and unspecified (incl cysts and polyps)0/1061/52
Acute exacerbation idiopathic pulmonary fibrosisRespiratory, thoracic and mediastinal disorders2/1060/52
Atrial fibrillationCardiac disorders1/1060/52
Coronary artery diseaseCardiac disorders1/1060/52
Inguinal herniaGastrointestinal disorders1/1060/52
Pancreatitis acuteGastrointestinal disorders1/1060/52
Rectal haemorrhageGastrointestinal disorders1/1060/52
Fractured sacrumInjury, poisoning and procedural complications1/1060/52
Acute respiratory failureRespiratory, thoracic and mediastinal disorders1/1060/52
Most frequent other events
Most frequent other events
EventGSK3915393Placebo
DiarrhoeaGastrointestinal disorders12/1067/52
FatigueGeneral disorders1/1064/52
VomitingGastrointestinal disorders2/1063/52
NasopharyngitisInfections and infestations2/1063/52
Weight decreasedInvestigations1/1063/52

Baseline characteristics

Age, Continuous
Age, Continuous(YEARS)GSK3915393PlaceboTotal
Mean72.1 ± 6.5372.4 ± 6.3372.2 ± 6.45
Sex: Female, Male
Sex: Female, Male(Participants)GSK3915393PlaceboTotal
Female22931
Male8443127
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)GSK3915393PlaceboTotal
White10451155
Other213
08

Study locations

56 sites
  • GSK Investigational Site
    Newport Beach, California 92663, United States
  • GSK Investigational Site
    Jacksonville, Florida 32224, United States
  • GSK Investigational Site
    St. Petersburg, Florida 33704, United States
  • GSK Investigational Site
    Ann Arbor, Michigan 48109-5360, United States
  • GSK Investigational Site
    Rochester, Minnesota 55905, United States
  • GSK Investigational Site
    New York, New York 10065, United States
  • GSK Investigational Site
    Wilmington, North Carolina 28401, United States
  • GSK Investigational Site
    Philadelphia, Pennsylvania 19140, United States
  • GSK Investigational Site
    Nashville, Tennessee 37204, United States
  • GSK Investigational Site
    Cypress, Texas 77429, United States
  • GSK Investigational Site
    Buenos Aires, C1426ABP, Argentina
  • GSK Investigational Site
    Ciudad Autonoma de Bueno, C1207AAP, Argentina
  • GSK Investigational Site
    Florida, B1602DQD, Argentina
  • GSK Investigational Site
    La Plata, 1900, Argentina
  • GSK Investigational Site
    Mendoza, M5500CCG, Argentina
  • GSK Investigational Site
    Rosario, S2000DBS, Argentina
  • GSK Investigational Site
    Vancouver, British Columbia V5Z 1M9, Canada
  • GSK Investigational Site
    St. John's, Newfoundland and Labrador A1B 3V6, Canada
  • GSK Investigational Site
    Ajax, Ontario L1S 2J5, Canada
  • GSK Investigational Site
    Hamilton, Ontario L8N 4A6, Canada
  • GSK Investigational Site
    Trois-Rivières, Quebec G8T 7A1, Canada
  • GSK Investigational Site
    La Tronche, 38700, France
  • GSK Investigational Site
    Paris, 75018, France
  • GSK Investigational Site
    Pessac, 33604, France
  • GSK Investigational Site
    Rennes, 35000, France
  • GSK Investigational Site
    Rouen, 76000, France
  • GSK Investigational Site
    Toulouse, 31059, France
  • GSK Investigational Site
    Essen, 45293, Germany
  • GSK Investigational Site
    Hanover, 30173, Germany
  • GSK Investigational Site
    Heidelberg, 69126, Germany
  • GSK Investigational Site
    Wuppertal, 42283, Germany
  • GSK Investigational Site
    Catania, 95123, Italy
  • GSK Investigational Site
    Monza MB, 20900, Italy
  • GSK Investigational Site
    Naples, Italy
  • GSK Investigational Site
    Padova, 35128, Italy
  • GSK Investigational Site
    Perugia, 06132, Italy
  • GSK Investigational Site
    Pisa, 56124, Italy
  • GSK Investigational Site
    Roma, 00168, Italy
  • GSK Investigational Site
    Sassari, 07100, Italy
  • GSK Investigational Site
    Torrette AN, Italy
  • GSK Investigational Site
    Eindhoven, 5623 EJ, Netherlands
  • GSK Investigational Site
    Rotterdam, 3015 CE, Netherlands
  • GSK Investigational Site
    Bialystok, 15-044, Poland
  • GSK Investigational Site
    Lodz, 90-153, Poland
  • GSK Investigational Site
    Poznan, 60-569, Poland
  • GSK Investigational Site
    Barcelona, 08907, Spain
  • GSK Investigational Site
    Barcelona, Spain
  • GSK Investigational Site
    Madrid, 28006, Spain
  • GSK Investigational Site
    Madrid, 28007, Spain
  • GSK Investigational Site
    Oviedo, 33011, Spain
  • GSK Investigational Site
    Pozuelo de AlarcOn Madr, 28223, Spain
  • GSK Investigational Site
    Santander, 39011, Spain
  • GSK Investigational Site
    Seville, 41013, Spain
  • GSK Investigational Site
    Edinburgh, EH16 4SA, United Kingdom
  • GSK Investigational Site
    Leeds West Yorkshire, LS9 7TF, United Kingdom
  • GSK Investigational Site
    London, SW3 6HP, United Kingdom
09

References and documents

Study documents

  • Study protocol · Jun 10, 2024
  • Statistical analysis plan · Aug 18, 2025

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: Yes — Study Sponsor will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to gsk-patient-level-data-sharing-july2025.pdf

Supporting information: Study protocol, Sap, Icf, Csr

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Sep 18, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT06317285
Lead sponsor
GlaxoSmithKline
Responsible party
Sponsor
First posted
Mar 19, 2024
Start date
Apr 4, 2024
Primary completion
Oct 1, 2025
Completion
Oct 1, 2025
Results posted
Sep 18, 2026
Last update
Sep 18, 2026

Study contacts

GSK Clinical Trials
study director · GlaxoSmithKline

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is terminated, as verified in Aug 2026. You cannot join it, but the record below documents what was studied.

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Start the discussion