| Primary | Part A: Number of Participants With Serious Adverse Events (SAEs) and Non-serious Adverse Events (Non-SAEs) | An adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. SAE is defined as any untoward medical occurrence that; results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations as judged by physician. Number of participants who had SAEs and non-SAEs are presented. | Safety Population comprised of all randomized (all participants who were randomized into the study and received a randomization number) participants who received study intervention. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG002 | Part A: Placebo IV- Japanese Participants | Japanese male participants were administered a single IV infusion of 0.9% w/v saline placebo. | | OG003 | Part A: GSK2831781 450 mg IV- Japanese Participants | Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. |
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| Non-SAEs | | |
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| Primary | Part B: Number of Participants With Serious Adverse Events (SAEs) and Non-serious Adverse Events (Non-SAEs) | An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. SAE is defined as any untoward medical occurrence that; results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations as judged by physician. Number of participants who had SAEs and non-SAEs are presented. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG002 | Part B: GSK2831781 450 mg SC |
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| Primary | Part A: Number of Participants With Vital Signs of Potential Clinical Importance | Vital signs were measured in a semi-supine position after five minutes of rest and included temperature, systolic blood pressure (SBP), diastolic blood pressure (DBP) and heart rate. The clinical concern range for the parameters were: SBP (low: <85 millimeters of mercury [mmHg] and high: >160 mmHg), DBP (low: <45 mmHg and high: >100 mmHg), heart rate (low: <40 beats per minute [bpm] and high: >110 bpm) and temperature (low: <35 degrees celsius [°C] and high: >=37.5 °C). Number of participants with any vital sign value of potential clinical importance is reported. | | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG002 | Part A: Placebo IV- Japanese Participants | Japanese male participants were administered a single IV infusion of 0.9% w/v saline placebo. |
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| Primary | Part B: Number of Participants With Vital Signs of Potential Clinical Importance | Vital signs were measured in a semi-supine position after five minutes of rest and included temperature, SBP, DBP and heart rate. The clinical concern range for the parameters were: SBP (low: <85 mmHg and high: >160 mmHg), DBP (low: <45 mmHg and high: >100 mmHg), heart rate (low: <40 bpm and high: >110 bpm) and temperature (low: <35 °C and high: >=37.5 °C). Number of participants with any vital sign value of potential clinical importance is reported. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG002 | Part B: GSK2831781 450 mg SC | Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781 to achieve a dose of 450 mg. |
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| Primary | Part A: Number of Participants With Any Hematology Parameter of Potential Clinical Importance | Blood samples were collected for the assessment of hematology parameters. The clinical concern range for the parameters were: hematocrit (high: >0.54 proportion of red blood cells in blood and low: change from Baseline <0.075 proportion of red cells in blood); hemoglobin (high: >180 grams per liter [g/L] and low: change from Baseline <25 g/L), lymphocytes (low: <0.8 Giga cells per liter [Giga cells/L]); neutrophil count (low: <1.5 Giga cells/L); eosinophil count (high: >1 Giga cells/L); platelet count (low: <100 Giga cells/L and high: >550 Giga cells/L) and white blood cells count (low: <3 Giga cells/L and high: >20 Giga cells/L). Number of participants with any hematology parameter value of potential clinical importance is reported. | | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG002 |
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| Primary | Part B: Number of Participants With Any Hematology Parameter of Potential Clinical Importance | Blood samples were collected for the assessment of hematology parameters. The clinical concern range for the parameters were: hematocrit (high: >0.54 proportion of red blood cells in blood and low: change from Baseline <0.075 proportion of red cells in blood); hemoglobin (high: >180 g/L and low: change from Baseline <25 g/L), lymphocytes (low: <0.8 Giga cells/L); neutrophil count (low: <1.5 Giga cells/L); eosinophil count (high: >1 Giga cells/L); platelet count (low: <100 Giga cells/L and high: >550 Giga cells/L) and white blood cells count (low: <3 Giga cells/L and high: >20 Giga cells/L). Number of participants with any hematology parameter value of potential clinical importance is reported. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. |
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| Primary | Part A: Number of Participants With Any Clinical Chemistry Parameter of Potential Clinical Importance | Blood samples were collected for the assessment of clinical chemistry parameters. The clinical concern range for the parameters were: alanine aminotransferase (high: >=2 times upper limit of normal [ULN]); aspartate aminotransferase (high: >=2 times ULN); alkaline phosphatase (high: >=2 times ULN); total bilirubin (high: >=1.5 times ULN); blood urea nitrogen (high: >10.5 millimoles per liter [mmol/L]); calcium (low: <2 mmol/L and high: >2.75 mmol/L); creatinine (high: change from Baseline >26 micromoles per liter); estimated glomerular filtration rate (low: <60 milliliter per minute per 1.73 squared meter); glucose (low: <3 mmol/L and high: >9 mmol/L); potassium (low: <3 mmol/L and high: >5.5 mmol/L); sodium (low: <130 mmol/L and high: >150 mmol/L) and total protein (low: <50 g/L and high: >85 g/L). Number of participants with any clinical chemistry parameter value of potential clinical importance is reported. | | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. |
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| Primary | Part B: Number of Participants With Any Clinical Chemistry Parameter of Potential Clinical Importance | Blood samples were collected for the assessment of clinical chemistry parameters. The clinical concern range for the parameters were: alanine aminotransferase (high: >=2 times ULN); aspartate aminotransferase (high: >=2 times ULN); alkaline phosphatase (high: >=2 times ULN); total bilirubin (high: >=1.5 times ULN); blood urea nitrogen (high: >10.5 mmol/L]); calcium (low: <2 mmol/L and high: >2.75 mmol/L); creatinine (high: change from Baseline >26 micromoles per liter); estimated glomerular filtration rate (low: <60 milliliter per minute per 1.73 squared meter); glucose (low: <3 mmol/L and high: >9 mmol/L); potassium (low: <3 mmol/L and high: >5.5 mmol/L); sodium (low: <130 mmol/L and high: >150 mmol/L) and total protein (low: <50 g/L and high: >85 g/L). Number of participants with any clinical chemistry parameter value of potential clinical importance is reported. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. |
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| Primary | Part A: Number of Participants With Any Urinalysis Parameter of Potential Clinical Importance (PCI) | Urine samples were analyzed for bilirubin (Bil.),glucose (Gl.),ketones (Keto),leukocytes (leuko),nitrite (Nit.),occult blood (OB) and protein (Pro.) by dipstick method. Urine red blood cells (RBC) and white blood cells (WBC) were assessed by microscopy. Urine potential of hydrogen (pH) and specific gravity (Sp.Gr.) were also analyzed. The dipstick results are read as Trace,1+,2+ indicating proportional concentrations. pH is measured on a numeric scale of 0 to 14 (pH 7: neutral, pH <7: acidic and pH >7: basic). Urine Sp. Gr. is a measure of the concentration of solutes in the urine and indicated as ratio of urine density to water density. The clinical concern range for these parameters were: Bil., Gl., Leuko, OB and Pro. (high: >1+),Keto (high: >2+),Nit. (high: positive),pH (low: <4.6 and high: >8),Sp.Gr. (low: <1.001 and high: >1.035),RBC (high: >3 cells/high power field [hpf]) and WBC (high: >5 cells/hpf). Number of participants with any urinalysis parameter value of PCI is reported. | | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. |
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| Primary | Part B: Number of Participants With Any Urinalysis Parameter of Potential Clinical Importance | Urine samples were analyzed for Bil., Gl., Keto, leuko, Nit., OB and Pro. by dipstick method. Urine RBC and WBC were assessed by microscopy. Urine pH and Sp.Gr. were also analyzed. The dipstick results are read as Trace, 1+, 2+ indicating proportional concentrations. pH is measured on a numeric scale of 0 to 14 (pH 7: neutral, pH <7: acidic and pH >7: basic). Urine Sp. Gr. is a measure of the concentration of solutes in the urine and indicated as ratio of urine density to water density. The clinical concern range for these parameters were: Bil., Gl., Leuko, OB and Pro. (high: >1+), Keto (high: >2+), Nit. (high: positive), pH (low: <4.6 and high: >8), Sp.Gr. (low: <1.001 and high: >1.035), RBC (high: >3 cells/hpf) and WBC (high: >5 cells/hpf). Number of participants with any urinalysis parameter value of PCI is reported. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. |
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| Primary | Part A: Number of Participants With Abnormal Electrocardiogram (ECG) Findings | Twelve-lead ECGs were recorded with the participants in a semi-supine position, after 5 minutes of rest using an ECG machine that automatically calculated heart rate and measured PR, QRS, QT and corrected QT (QTc) intervals. Number of participants with worst-case clinically significant and not clinically significant abnormal ECG findings have been presented. Clinically significant abnormal findings are those which are not associated with the underlying disease, unless judged by the investigator to be more severe than expected for the participant's condition. | | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG002 | Part A: Placebo IV- Japanese Participants | Japanese male participants were administered a single IV infusion of 0.9% w/v saline placebo. |
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| Primary | Part B: Number of Participants With Abnormal Electrocardiogram (ECG) Findings | Twelve-lead ECGs were recorded with the participants in a semi-supine position, after 5 minutes of rest using an ECG machine that automatically calculated heart rate and measured PR, QRS, QT and QTc intervals. Number of participants with worst-case clinically significant and not clinically significant abnormal ECG findings have been presented. Clinically significant abnormal findings are those which are not associated with the underlying disease, unless judged by the investigator to be more severe than expected for the participant's condition. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG002 | Part B: GSK2831781 450 mg SC |
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| Primary | Part A: Number of Participants With Injection Site Reaction | Local tolerability as measured by injection site reaction example; bruise at the site of injection and/or itching, pain, blistering or skin damage. Number of participants with any injection site reaction are presented. | | Posted | | Count of Participants | | Participants | | Up to 24 hours (Day 1) | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG002 | Part A: Placebo IV- Japanese Participants | Japanese male participants were administered a single IV infusion of 0.9% w/v saline placebo. | | OG003 | Part A: GSK2831781 450 mg IV- Japanese Participants | |
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| Primary | Part B: Number of Participants With Injection Site Reaction | Local tolerability as measured by injection site reaction example; bruise at the site of injection and/or itching, pain, blistering or skin damage. Number of participants with any injection site reaction are presented. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 8 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG002 | Part B: GSK2831781 450 mg SC | Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781 to achieve a dose of 450 mg. |
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| Secondary | Part A: Area Under the Plasma Drug Concentration Versus Time Curve From Time Zero to Time of Last Quantifiable Concentration (AUC[0 to t]) of GSK2831781 Following IV Dose | Blood samples were collected at indicated time points for pharmacokinetic analysis. Pharmacokinetic parameters were calculated using standard non-compartmental analysis. | Pharmacokinetic Population comprised of all safety participants for whom a pharmacokinetic sample was obtained and analyzed. | Posted | | Geometric Mean | Geometric Coefficient of Variation | Hours*micrograms per milliliter | | Day 1 (Pre-dose and 1, 2, 6, 12, 24 hours post-dose); Days 3, 4, 8, 15, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG001 | Part A: GSK2831781 450 mg IV- Japanese Participants | Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. |
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| Secondary | Part A: Maximum Observed Plasma Concentration (Cmax) of GSK2831781 Following IV Dose | Blood samples were collected at indicated time points for pharmacokinetic analysis. Pharmacokinetic parameters were calculated using standard non-compartmental analysis. | Pharmacokinetic Population | Posted | | Geometric Mean | Geometric Coefficient of Variation | Micrograms per milliliter | | Day 1 (Pre-dose and 1, 2, 6, 12, 24 hours post-dose); Days 3, 4, 8, 15, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG001 | Part A: GSK2831781 450 mg IV- Japanese Participants | Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. |
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| Secondary | Part A: Time to Maximum Observed Plasma Concentration (Tmax) of GSK2831781 Following IV Dose | Blood samples were collected at indicated time points for pharmacokinetic analysis. Pharmacokinetic parameters were calculated using standard non-compartmental analysis. | Pharmacokinetic Population | Posted | | Median | Full Range | Hours | | Day 1 (Pre-dose and 1, 2, 6, 12, 24 hours post-dose); Days 3, 4, 8, 15, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG001 | Part A: GSK2831781 450 mg IV- Japanese Participants | Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. |
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| Secondary | Part B: AUC(0 to t) of GSK2831781 Following SC Dose | Blood samples were collected at indicated time points for pharmacokinetic analysis. Pharmacokinetic parameters were calculated using standard non-compartmental analysis. | Pharmacokinetic Population | Posted | | Geometric Mean | Geometric Coefficient of Variation | Hours*micrograms per milliliter | | Day 1 (Pre-dose); Days 2, 3, 4, 6, 8, 11, 15, 18, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG001 | Part B: GSK2831781 450 mg SC | Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781 to achieve a dose of 450 mg. |
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| Secondary | Part B: Cmax of GSK2831781 Following SC Dose | Blood samples were collected at indicated time points for pharmacokinetic analysis. Pharmacokinetic parameters were calculated using standard non-compartmental analysis. | Pharmacokinetic Population | Posted | | Geometric Mean | Geometric Coefficient of Variation | Micrograms per milliliter | | Day 1 (Pre-dose); Days 2, 3, 4, 6, 8, 11, 15, 18, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG001 | Part B: GSK2831781 450 mg SC | Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781 to achieve a dose of 450 mg. |
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| Secondary | Part B: Tmax of GSK2831781 Following SC Dose | Blood samples were collected at indicated time points for pharmacokinetic analysis. Pharmacokinetic parameters were calculated using standard non-compartmental analysis. | Pharmacokinetic Population | Posted | | Median | Full Range | Hours | | Day 1 (Pre-dose); Days 2, 3, 4, 6, 8, 11, 15, 18, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG001 | Part B: GSK2831781 450 mg SC | Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781 to achieve a dose of 450 mg. |
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| Secondary | Part A and Part B: Bioavailability (F) of GSK2831781 Following IV Dosing at 450 mg (Caucasian and Japanese Participants) or SC Dosing at 150 mg and 450 mg (Caucasian Participants) | Blood samples were collected at indicated time points for pharmacokinetic analysis in Part A (IV dose) and Part B (SC doses). Bioavailability of GSK2831781 was estimated by fitting a population pharmacokinetic model to all available data (Part A and Part B) of GSK2831781 concentrations in plasma and total soluble lymphocyte activation gene-3 (LAG3) concentrations in serum and was expressed as a percentage. | Pharmacokinetic Population. Given the non-linearity in pharmacokinetics, a population pharmacokinetic analysis of pooled data from Part A and Part B was more appropriate. Hence, this outcome measure was estimated on pooled data from Part A and Part B. | Posted | | Number | 95% Confidence Interval | Percentage Bioavailability | | Part A (IV): Day 1 (Pre-dose and 1, 2, 6, 12, 24 hours post-dose); Days 3, 4, 8, 15, 22, 29, 43, 57, 71, 85 and 112; Part B (SC): Day 1 (Pre-dose); Days 2, 3, 4, 6, 8, 11, 15, 18, 22, 29, 43, 57, 71, 85 and 112 | | | | ID | Title | Description |
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| OG000 | Part A and Part B: All Participants | In Part A, Caucasian and Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. In Part B, Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per mL of GSK2831781, diluted in 0.9% w/v saline and also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. To achieve a dose of 450 mg, Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781. |
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| Secondary | Degradation Rate of LAG3 Positive T Cells (Kout) Derived From Statistical Analysis of the Relationship Between LAG3 Positive T Cell Levels in Blood and GSK2831781 Concentrations in Plasma (Part A and Part B) | Blood samples were collected to measure LAG3 positive T cell levels. Plasma samples were collected to measure concentrations of GSK2831781 in plasma. The relationship between the pharmacodynamic measure (LAG3 positive T cell levels in blood) and plasma concentrations of GSK2831781 was described by an indirect response (Emax type) pharmacokinetic/pharmacodynamic (PK/PD) model. Kout was calculated by fitting the PK/PD model to all available data (Part A and Part B) of GSK2831781 concentrations in plasma and LAG3 positive T cells in blood. The model parameter; Kout is presented. | Pharmacokinetic Population. Given the limited dose range (150 mg-450 mg) in each part, a population PK/PD analysis of combined data from Part A and Part B was more appropriate. Hence, this outcome measure was estimated on combined data from Part A and Part B. | Posted | | Mean | 95% Confidence Interval | Per hour | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A and Part B: All Participants | In Part A, Caucasian and Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. In Part B, Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per mL of GSK2831781, diluted in 0.9% w/v saline and also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. To achieve a dose of 450 mg, Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781. |
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| Secondary | Baseline of LAG3 Positive T Cell Count (CELL0) Derived From Statistical Analysis of the Relationship Between LAG3 Positive T Cell Levels in Blood and GSK2831781 Concentrations in Plasma (Part A and B) | Blood samples were collected to measure LAG3 positive T cell levels. Plasma samples were collected to measure concentrations of GSK2831781 in plasma. The relationship between the pharmacodynamic measure (LAG3 positive T cell levels in blood) and plasma concentrations of GSK2831781 was described by an indirect response (Emax type) PK/PD model. CELL0 was calculated by fitting the PK/PD model to all available data (Part A and Part B) of GSK2831781 concentrations in plasma and LAG3 positive T cells in blood. The model parameter; CELL0 is presented. | Pharmacokinetic Population. Given the limited dose range (150 mg-450 mg) in each part, a population PK/PD analysis of combined data from Part A and Part B was more appropriate. Hence, this outcome measure was estimated on combined data from Part A and Part B. | Posted | | Mean | 95% Confidence Interval | Cells per microliter | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A and Part B: All Participants | In Part A, Caucasian and Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. In Part B, Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per mL of GSK2831781, diluted in 0.9% w/v saline and also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. To achieve a dose of 450 mg, Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781. |
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| Secondary | Concentration of Free GSK2831781 at Which Half Maximum Effect on Kout is Achieved (EC50) Derived From Statistical Analysis of the Relationship Between LAG3 Positive T Cell Levels in Blood and GSK2831781 Concentrations in Plasma (Part A and B) | Blood samples were collected to measure LAG3 positive T cell levels. Plasma samples were collected to measure concentrations of GSK2831781 in plasma. The relationship between the pharmacodynamic measure (LAG3 positive T cell levels in blood) and plasma concentrations of GSK2831781 was described by an indirect response (Emax type) PK/PD model. EC50 was calculated by fitting the PK/PD model to all available data (Part A and Part B) of GSK2831781 concentrations in plasma and LAG3 positive T cells in blood. As there was a limited dose range, to allow for a successful model conversion, EC50 was fixed to the EC50 value estimated from a previous study. The model parameter; EC50 is presented. | Pharmacokinetic Population. Given the limited dose range (150 mg-450 mg) in each part, a population PK/PD analysis of combined data from Part A and Part B was more appropriate. This outcome measure was fixed to the EC50 value estimated from a previous study. | Posted | | Mean | 95% Confidence Interval | Nanograms per milliliter | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A and Part B: All Participants | In Part A, Caucasian and Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. In Part B, Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per mL of GSK2831781, diluted in 0.9% w/v saline and also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. To achieve a dose of 450 mg, Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781. |
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| Secondary | Maximum Effect of Change in Kout (Emax) Derived From Statistical Analysis of the Relationship Between LAG3 Positive T Cell Levels in Blood and GSK2831781 Concentrations in Plasma (Part A and B) | Blood samples were collected to measure LAG3 positive T cell levels. Plasma samples were collected to measure concentrations of GSK2831781 in plasma. The relationship between the pharmacodynamic measure (LAG3 positive T cell levels in blood) and plasma concentrations of GSK2831781 was described by an indirect response (Emax type) PK/PD model. Emax, a unitless parameter that describes the maximum change in Kout at infinite GSK2831781 concentration, was calculated by fitting the PK/PD model to all available data (Part A and Part B) of GSK2831781 concentrations in plasma and LAG3 positive T cells in blood. The model parameter; Emax is presented. | Pharmacokinetic Population. Given the limited dose range (150 mg-450 mg) in each part, a population PK/PD analysis of combined data from Part A and Part B was more appropriate. Hence, this outcome measure was estimated on combined data from Part A and Part B. | Posted | | Mean | 95% Confidence Interval | Unitless | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A and Part B: All Participants | In Part A, Caucasian and Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. In Part B, Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per mL of GSK2831781, diluted in 0.9% w/v saline and also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. To achieve a dose of 450 mg, Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781. |
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| Secondary | Hill Coefficient (GAM) Derived From Statistical Analysis of the Relationship Between LAG3 Positive T Cell Levels in Blood and GSK2831781 Concentrations in Plasma (Part A and B) | Blood samples were collected to measure LAG3 positive T cell levels. Plasma samples were collected to measure concentrations of GSK2831781 in plasma. The relationship between the pharmacodynamic measure (LAG3 positive T cell levels in blood) and plasma concentrations of GSK2831781 was described by an indirect response (Emax type) PK/PD model. The Hill coefficient GAM, a unitless parameter defining the steepness of the concentration-effect curve, was calculated by fitting the PK/PD model to all available data (Part A and Part B) of GSK2831781 concentrations in plasma and LAG3 positive T cells in blood. The model parameter; GAM is presented. | Pharmacokinetic Population. Given the limited dose range (150 mg-450 mg) in each part, a population PK/PD analysis of combined data from Part A and Part B was more appropriate. Hence, this outcome measure was estimated on combined data from Part A and Part B. | Posted | | Mean | 95% Confidence Interval | Unitless | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A and Part B: All Participants | In Part A, Caucasian and Japanese male participants were administered a single IV infusion of GSK2831781 at a dose of 450 mg, diluted in 0.9% w/v saline. In Part B, Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per mL of GSK2831781, diluted in 0.9% w/v saline and also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. To achieve a dose of 450 mg, Caucasian male participants were administered three SC injections of a unit dose strength of 150 mg per mL of GSK2831781. |
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| Secondary | Part A: Number of Participants With Confirmed Positive Post-Baseline Anti-drug Antibody Result | Serum samples were analyzed for the presence of anti-GSK2831781 antibodies using a validated immunoassay. The assay involved screening, confirmation and titration steps. If serum samples tested positive in the screening assay, they were considered 'potentially positive' and were further analyzed for the specificity using the confirmation assay. Samples that confirmed positive in the confirmation assay were reported as 'confirmed positive'. Number of participants with confirmed positive post-Baseline ADA result are presented. | | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part A: Placebo IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of 0.9% weight by volume (w/v) saline placebo. | | OG001 | Part A: GSK2831781 450 mg IV- Caucasian Participants | Caucasian male participants were administered a single IV infusion of GSK2831781 at a dose of 450 milligram (mg), diluted in 0.9% w/v saline. | | OG002 | Part A: Placebo IV- Japanese Participants | Japanese male participants were administered a single IV infusion of 0.9% w/v saline placebo. |
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| Secondary | Part B: Number of Participants With Confirmed Positive Post-Baseline Anti-drug Antibody Result | Serum samples were analyzed for the presence of anti-GSK2831781 antibodies using a validated immunoassay. The assay involved screening, confirmation and titration steps. If serum samples tested positive in the screening assay, they were considered 'potentially positive' and were further analyzed for the specificity using the confirmation assay. Samples that confirmed positive in the confirmation assay were reported as 'confirmed positive'. Number of participants with confirmed positive post-Baseline ADA result are presented. | Safety Population. Placebo arms across similar dosing strategies were combined in Part B. | Posted | | Count of Participants | | Participants | | Up to Day 112 | | | | ID | Title | Description |
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| OG000 | Part B: Placebo SC | Caucasian male participants were administered three SC injections of 0.9% w/v saline placebo. | | OG001 | Part B: GSK2831781 150 mg SC | Caucasian male participants were administered a single SC injection of a unit dose strength of 150 mg per milliliter (mL) of GSK2831781, diluted in 0.9% w/v saline. Participants also received 2 dummy injections of 0.9% w/v saline placebo SC to maintain the blinding. | | OG002 | Part B: GSK2831781 450 mg SC |
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