First Time in Human (FTIH) Study to Evaluate Safety, Tolerability, Immunogenicity, Pharmacokinetics (PK) and Pharmacodynamics (PD) of GSK3511294 Administered Subcutaneously (SC) in Subjects With Mild to Moderate Asthma

GlaxoSmithKline50 enrolled

Overview

GSK3511294 is a humanized monoclonal antibody antagonist of Interleukin (IL)-5 which is known to block binding of IL-5 to the IL-5 receptor complex, causing a reduction in the circulating population of eosinophils. This is a single ascending dose FTIH study to investigate safety, tolerability, immunogenicity, pharmacokinetics (PK) and pharmacodynamics (PD) of GSK3511294, administered SC in subjects with mild to moderate asthma maintained on a low-medium daily dose of inhaled corticosteroids (ICS) or ICS/long acting beta-agonist (LABA), and short acting beta-agonist (SABA). The subjects will attend a pre-screen visit of up to 12 weeks before dosing for assessment of blood eosinophils. Eligible subjects with blood eosinophils \>=200 cells per microliter (cells/µL) will undergo a screening period of up to 4 weeks. The subjects will then be randomized into 5 cohorts. In each cohort, the subjects will be randomized to receive a single dose of GSK3511294 or placebo in a ratio of 3:1. The follow-up period will be up to 40 weeks post dose and will be dose-dependent. The scheduled maximum duration for each subject will be up to 44 weeks including up to 28 days of screening.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Asthma

Interventions

GSK3511294DRUG

GSK3511294 will be available as a clear or opalescent, colorless or yellow to brown solution for injection at unit dose strength of 150 milligrams per milliliter (mg/mL). GSK3511294 will be diluted in 0.9% weight by volume (w/v) sodium chloride to achieve the desired concentration for administration. GSK3511294 will be administered by SC injection.

PlaceboDRUG

Matching Placebo will consist of 0.9% w/v sodium chloride which will be administered by the SC route.

Salbutamol/albuterolDRUG

Salbutamol/albuterol will be supplied to all subjects for use as rescue medication during the study.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 65 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Subjects should be between 18 and 65 years of age inclusive, at the time of signing the informed consent. * Blood eosinophils of \>= 200 cells/µL at screening. * A physician diagnosis of asthma (mild or moderate, as defined by the Global Initiative for Asthma \[GINA\], 2017) at least 12 months prior to the start of the study. The reason for diagnosis of asthma should be documented in the subject's source data, including relevant history and investigations - specifically evidence of airway hyper-responsiveness, airflow variation (peak flow rate or forced expiratory volume in one second \[FEV1\]) or reversible airflow obstruction should also be documented in the subject's source data. * A screening pre-bronchodilator FEV1 \>= 60% of predicted normal value. * Asthma Control Test score \> 19. * hsCRP of \< 10 milligrams per liter (mg/L) at screening. * Otherwise healthy (other than the acceptable conditions of asthma and other atopic diseases, including allergic rhinitis and atopic dermatitis) based on a screening medical history, physical examination, vital signs, ECG assessment, pulmonary function testing, and clinical laboratory results. * Maintained controlled on as needed SABA and one of the following: a) stable dose of ICS; b) stable dose of combination therapy: ICS/LABA. * Body weight \>= 50 kilograms (kg), and body mass index (BMI) of 19-32 kilograms per square meter (kg/m\^2) inclusive. * Male and female subjects. a) a female subject is eligible to participate if she is not pregnant, not breastfeeding, and not a woman of childbearing potential. b) as GSK3511294 is a monoclonal antibody that is not anticipated to interact directly with Deoxyribonucleic acid (DNA) or other chromosomal material with minimal exposure through semen expected, male subjects will not be required to use contraception during the study, nor are they prohibited from donating sperm. * Capable of giving signed informed consent, which includes compliance with the requirements and restrictions of the study. Exclusion Criteria: * Any asthma exacerbation requiring systemic corticosteroids within 12 weeks of screening, or that resulted in overnight hospitalization requiring additional treatment for asthma within 6 months prior to screening. * A history of life-threatening asthma defined as an asthma episode that required intubation and/or was associated with hypercapnia, respiratory arrest or hypoxic seizures within the last 5 years. * Significant pulmonary diseases, other than asthma, including (but not limited to): pneumonia previously requiring hospital admission, pulmonary fibrosis, bronchopulmonary dysplasia, chronic bronchitis, emphysema, chronic obstructive pulmonary disease, or other significant respiratory abnormalities. * Suspected or confirmed bacterial or viral infection (including tuberculosis) of the upper or lower respiratory tract, sinus or middle ear that occurred within and/or has not resolved within 4 weeks of screening that: led to a change in asthma management or in the opinion of the Investigator, is expected to affect the subject's asthma status or the subject's ability to participate in the study. * Positive for hepatitis B surface antigen (HBsAg) at screening. * Positive hepatitis C antibody test result at screening, or within 3 months prior to first dose of study treatment. * Known immunodeficiency (other than that explained by the use of corticosteroids), including a positive test for human immunodeficiency virus (HIV) antibody at screening. * Latent or chronic infections (example, genital herpes, urinary tract infections) or at risk of infection (example, significant trauma or infection within the 90 days before screening). * Opportunistic infection within 6 months prior to screening (example, a non-tuberculous mycobacterial infection or cytomegalovirus, pneumocystosis, aspergillosis). * Parasitic infestation within 6 months prior to screening, or have travelled to a country with a high prevalence of such infections in the 6 months before screening, or intend to do so in the year after dosing. * Live vaccine within 4 weeks prior to screening, or intention to receive live vaccine during the study. * Corrected QT by Fridericia's formula (QTcF) interval \> 450 milliseconds (msec) * A personal history of severe hypertension, arrhythmia, Right Bundle Branch Block, or Left Bundle Branch Block, or a family history of sudden unexplained death, long QT, familial cardiac syndrome, or cardiomyopathy. * ALT \>1.5 times upper limit of normal (ULN). * Bilirubin \>1.5 times ULN. Isolated bilirubin \>1.5 times ULN is acceptable if bilirubin is fractionated and direct bilirubin \<35%. * Current or chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones). * Any history or presence of clinically relevant cardiac or cardiovascular, gastrointestinal, hepatic, renal, metabolic, hematological, neurological, osteomuscular, articular, psychiatric, systemic, ocular, or infectious disease or immunodeficiency, or signs of acute illness, or any other illness or condition that, in the opinion of the investigator (in consultation with the medical monitor), would adversely affect the subject's participation in this study. * A previous history of cancer in remission for less than 5 years prior to screening (except for localized carcinoma of the skin that had been resected for cure) or current malignancy. * A positive drug/alcohol test before dosing, OR any history of drug abuse OR regular alcohol consumption within 6 months of the study defined as: An average weekly intake of \> 14 units alcohol. One unit is equivalent to 8 grams (g) of alcohol: a half-pint (equivalent to 240 milliliters \[mL\]) of beer, 1 glass (125 mL) of wine or 1 (25 mL) measure of spirits. * Current smokers or ex-smokers who have given up smoking for \< 12 months and/or have a smoking pack history of \> 5 pack years (1 pack year = 20 cigarettes per day for 1 year or 5 cigarettes per day for 4 years). * Urinary cotinine levels indicative of smoking or history or regular use of tobacco- or nicotine-containing products within 6 months prior to screening. * Anticipated non-availability and/or risk of non-compliance with study visits and procedures, or unwillingness or inability to follow the study specific procedures. * The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 3 months, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer). * Exposure to more than 4 investigational medicinal products within 12 months prior to the first dosing day. * History of sensitivity to any of the study medications, or its components, or a history of drug reaction or other allergy that, in the opinion of the investigator or Medical Monitor, contraindicates their participation. * Major surgery within 90 days prior to screening, or planned in-patient surgery or hospitalization during the study period * Donation or loss of blood or blood products in excess of 500 mL within the 3 months before dosing. * History of renal disease, abnormal kidney function or evidence of persisting or clinically relevant protein or blood on urinalysis. * History or signs of immunologically active disease (including the presence of low C3 or low C4) or thrombocytopenia. * History of vasculitis. * Subjects are excluded if they are undergoing desensitization therapy, or have received any of the following medications as indicated prior to screening: anti- Immunoglobulin E (IgE) therapy (within 6 months); anti-IL5 (within 6 months); oral or injectable corticosteroids (within 8 weeks); long acting muscarinic antagonist (LAMA) or leukotriene receptor antagonist (LTRA) therapy (within 8 weeks); drugs that can prolong the QT interval. * Subjects who are employees of the sponsor or clinical unit are excluded. * Vulnerable subjects, e.g., participants kept in detention, protected adults under guardianship, trusteeship and soldiers, or participants committed to an institution by governmental or juridical order.

Locations (5)

GSK Investigational Site

Hanover, Lower Saxony, Germany

GSK Investigational Site

Berlin, Germany

GSK Investigational Site

Harrow, Middlesex, United Kingdom

GSK Investigational Site

London, United Kingdom

GSK Investigational Site

Manchester, United Kingdom

Outcomes

Primary Outcomes

Number of Participants With Adverse Events (AEs) and Serious AEs (SAE)

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 defined as 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 disability/incapacity; is a congenital anomaly/birth defect; other important medical events that may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed before; is associated with liver injury and impaired liver function.

Time frame: Up to Week 40

Number of Participants With Adverse Events of Special Interest (AESI)

AESIs were defined as Hypersensitivity (narrow) and Injection site reactions like hematoma and swelling.

Time frame: Up to Week 40

Change From Baseline in Neutrophil, Lymphocyte, Monocyte, Eosinophil, Basophil and Platelet Count

Blood samples were collected at indicated time-points for analysis of hematology parameters like platelet count, neutrophils, lymphocytes, monocytes, eosinophils and basophils. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Red Blood Cell Count (RBC)

Blood samples were collected at indicated time-points for analysis of hematology parameters like RBC count. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Mean Corpuscle Volume (MCV)

Blood samples were collected at indicated time-points for analysis of hematology parameters like MCV. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Mean Corpuscle Hemoglobin (MCH)

Blood samples were collected at indicated time-points for analysis of hematology parameters like MCH. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Hemoglobin

Blood samples were collected at indicated time-points for analysis of hematology parameters like hemoglobin. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Hematocrit

Blood samples were collected at indicated time-points for analysis of hematology parameters like hematocrit. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Clinical Chemistry Parameter: High Sensitivity C-reactive Protein (hsCRP)

Blood samples were collected at indicated time-points for analysis of clinical parameters like hsCRP. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Clinical Chemistry Parameter of Total Protein and Albumin

Blood samples were collected at indicated time-points for analysis of clinical parameters like total protein and albumin. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Clinical Chemistry Parameters Like Total Bilirubin, Direct Bilirubin and Creatinine

Blood samples were collected at indicated time-points for analysis of clinical parameters like total bilirubin, direct bilirubin and creatinine. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Urine Specific Gravity Analysis by Dipstick Method

Urinary specific gravity measurement is a routine part of urinalysis. Urine specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidney's ability to concentrate urine. The concentration of the excreted molecules determines the urine's specific gravity.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP)

SBP and DBP were assessed in a supine position after 5 minutes of rest. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at 2 and 8 hours at Day 1; Days 2, 3, 4 and 5; Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Temperature

Temperature was assessed in a supine position after 5 minutes of rest. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at 2 and 8 hours at Day 1; Days 2, 3, 4 and 5; Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Heart Rate

Heart rate was assessed in a supine position after 5 minutes of rest. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at 2 and 8 hours at Day 1; Days 2, 3, 4 and 5; Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Respiration Rate

Respiration rate was assessed in a supine position after 5 minutes of rest. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at 2 and 8 hours at Day 1; Days 2, 3, 4 and 5; Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Heart Rate: Electrocardiogram (ECG)

12-lead ECG were performed in a supine position using an automated ECG machine that calculated the heart rate and measured PR, QRS, QT and corrected QT (QTc) intervals. ECG measurements were performed in triplicate. When multiple ECGs were performed at the same planned timepoint, the average value of each parameter was used. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at 2 and 8 hours on Day 1; Days 2, 3, 4 and 5; Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in PR Interval, QRS Interval, QT Interval and QT Interval Corrected by Fridericia's Formula (QTcF) Interval

12-lead ECG were performed in a supine position using an automated ECG machine that calculated PR interval, QRS interval, QT interval and QTcF interval. ECG measurements were performed in triplicate. When multiple ECGs were performed at the same planned timepoint, the average value of each parameter was used. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at 2 and 8 hours on Day 1; Days 2, 3, 4 and 5; Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Clinical Chemistry Parameters Like Alkaline Phosphatase (ALP), Alanine Aminotransferase (ALT), and Aspartate Aminotransferase (AST)

Blood samples were collected at indicated time-points for analysis of clinical parameters like ALP, AST and ALT. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Change From Baseline in Clinical Chemistry Parameter Like Glucose, Calcium, Potassium, Sodium, Blood Urea Nitrogen (BUN), and Magnesium

Blood samples were collected at indicated time-points for analysis of clinical parameters like glucose, calcium, potassium, sodium, BUN, and magnesium. Baseline was defined as latest pre-dose assessment with a non-missing value. Change from Baseline was defined as post-dose visit value minus Baseline value.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Number of Participants With Presence of Ketones, Glucose, Occult Blood, and Protein

Urine samples were collected to analyze presence of ketones, occult blood, glucose, and protein in urine. In this dipstick test, the level of occult blood, glucose, ketones and urine protein in urine samples were recorded as negative, trace, 1+ and 2+ indicating proportional concentrations in urine. Only categories with abnormal significant values have been presented.

Time frame: Baseline and at Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Urine Potential of Hydrogen (pH) Analysis by Dipstick Method

Urinary pH measurement is a routine part of urinalysis. Urine pH is an acid-base measurement. pH is measured on a numeric scale ranging from 0 to 14; values on the scale refer to the degree of alkalinity or acidity. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Normal urine has a slightly acid pH (5.0 - 6.0).

Time frame: Days 2, 3, 4 and 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Absolute Values of Complement (C)3 and C4

Blood samples were collected at indicated timepoints for analysis for complement (C3 and C4). Baseline was defined as latest pre-dose assessment with a non-missing value.

Time frame: Baseline and at Days 2, 3, 4 and 5; Weeks 2, 4, 8, 12, 18, 24, 26, 32, 36 and 40

Secondary Outcomes

Area Under the Curve From Time Zero to Infinity (AUC[0-inf]) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-inf). Pharmacokinetic parameters were calculated by standard non compartmental analysis. Pharmacokinetic Population included participants in the Safety population for whom a pharmcokinetic sample was obtained and analyzed.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

AUC(0-inf) of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-inf). Pharmacokinetic parameters were calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

AUC(0-inf) of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-inf). Pharmacokinetic parameters were calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Area Under the Curve From Time Zero to the Last Measurable Concentration (AUC[0-t]) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-t). Pharmacokinetic parameters were calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

AUC(0-t) of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-t). Pharmacokinetic parameters were calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

AUC(0-t) of GSK3511294 300 mg

Data from ClinicalTrials.gov

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Blood samples were collected from participants at indicated time points and analyzed for AUC (0-t). Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Area Under the Concentration-time Curve From Time Zero to Week 4 (AUC[0-Week 4]) of GSK3511294

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-Week 4). Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, and 4 post-dose

Area Under the Concentration-time Curve From Time Zero to Week 12 (AUC[0-Week 12]) of GSK3511294

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-Week 12). Pharmacokinetic parameters were calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8 and 12 post-dose

Area Under the Concentration-time Curve From Time Zero to Week 26 (AUC [0-Week 26]) of GSK3511294

Blood samples were collected from participants at indicated time points and analyzed for AUC (0-Week 26). Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24 and 26 post-dose

Percentage of AUC (0-inf) Obtained by Extrapolation (%AUCex) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for %AUCex. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

%AUCex of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for %AUCex. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

%AUCex of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for %AUCex. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Maximum Observed Concentration (Cmax) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for Cmax. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

Cmax of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for Cmax. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

Cmax of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for Cmax. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Time of Occurrence of Cmax (Tmax) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for Tmax. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

Tmax of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for Tmax. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

Tmax of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for Tmax. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Time of Last Quantifiable Concentration (Tlast) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for Tlast. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

Tlast of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for Tlast. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

Tlast of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for Tlast. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Apparent Clearance Following Subcutaneous Dosing (CL/F) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for CL/F. CL/F was calculated as dose divided by AUC(0-inf). Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

CL/F of GSK3511294 30 mg and 100 mg

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

CL/F of GSK3511294 300 mg

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Apparent Volume of Distribution After Subcutaneous Administration (Vd/F) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for Vd/F. Vd/F was calculated as dose divided by terminal elimination rate constant (lambda\_z) \*AUC(0-inf). Pharmacokinetic parameters were calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

Vd/F of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for Vd/F. Vd/F was calculated as dose divided by \[lambda\_z \*AUC(0-inf)\]. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

Vd/F of GSK3511294 300 mg

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Terminal Phase Elimination Rate Constant (Lambda_z) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for lambda\_z. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

Lambda_z of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for lambda\_z. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

Lambda_z of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for lambda\_z. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Terminal Phase Half-life (t1/2) of GSK3511294 2 mg and 10 mg

Blood samples were collected from participants at indicated time points and analyzed for t1/2. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, and 26 post-dose

T1/2 of GSK3511294 30 mg and 100 mg

Blood samples were collected from participants at indicated time points and analyzed for t1/2. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26 and 36 post-dose

T1/2 of GSK3511294 300 mg

Blood samples were collected from participants at indicated time points and analyzed for t1/2. Pharmacokinetic parameters was calculated by standard non compartmental analysis.

Time frame: Pre-dose, 2 and 8 hours on Day 1; Days 2,3,5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32 and 40 post-dose

Ratio to Baseline in Absolute Blood Eosinophil Count

Blood samples were collected at indicated time-points. Analysis was performed using a mixed model repeated measures analysis (MMRM) model on log-transformed data with fixed categorical effects of treatment, planned timepoint and treatment-by-planned timepoint interaction and fixed continuous covariates of log Baseline blood eosinophil count and log Baseline blood eosinophil count-by-planned timepoint interaction. Baseline is defined as the latest predose non-missing blood eosinophil count. Ratio to Baseline is defined as post-dose visit value divided by Baseline value. Pharmacodynamic Population included participants in the 'Safety' population for whom a post-dose pharmacodynamic (ie blood eosinophil) sample was obtained and analyzed.

Time frame: Baseline, Days 2, 3, 4, 5, Weeks 1, 2, 4, 8, 12, 18, 24, 26, 32, 36, and 40

Number of Participants With Anti-drug Antibody (ADA) Binding to GSK3511294

Serum samples were collected to determine the presence of anti-GSK3511294 binding antibodies using a validated bioanalytical method. Data for any time post-Baseline is reported. The results were categorized as negative, transient positive (defined as a single confirmatory positive immunogenic response that does not occur at the final study assessment) and persistent positive (defined as a confirmatory positive immunogenic response for at least 2 consecutive assessments or a single result at the final study assessment).

Time frame: Up to Week 40

Titers of Binding ADA to GSK3511294

Time frame: Up to Week 40