Efficacy and Safety Study of Mepolizumab in Subjects With... | NCT03055195

Label	Type	Description	Intervention Names
Mepolizumab	Experimental	Eligible subjects will receive mepolizumab 100 mg subcutaneously every 4 weeks on Day 1, Week 4, Week 8, and Week 12	Drug: Mepolizumab 100 mg
Placebo	Placebo Comparator	Eligible subjects will receive matching placebo subcutaneously every 4 weeks on Day 1, Week 4, Week 8, and Week 12	Drug: Placebo matching mepolizumab

Name	Type	Description	Arm Group Labels	Other Names
Mepolizumab 100 mg	Drug	Mepolizumab is available as lyophilized powder in sterile vials for injection. The content is reconstituted with 1.2 milliliter (mL) Sterile Water just prior to use. Subjects will receive 1mL (100 mg/mL) bolus subcutaneous injections.

Measure	Description	Time Frame
Number of Participants With an Investigator's Global Assessment (IGA) Score of 0 or 1 and at Least a 2- Grade Improvement at Week 16	The IGA is a clinical tool for assessing the current state/severity of a participant's atopic dermatitis . It is a static 5-point morphological assessment of overall disease severity determined by the investigator, sub-investigator, or trained healthcare professional with required qualifications on a scale of 0 to 4 where, 0-clear, 1-almost clear, 2-mild, 3-moderate, and 4- severe. Higher score indicates severity of disease. A responder is defined as a participant who had an IGA score of 0 or 1 and a minimum 2-grade improvement from Baseline. Number of participants with IGA score of 0 or 1 and at least a 2- grade improvement at Week 16 was presented.	Week 16

Measure	Description	Time Frame
Mean Percentage Change in Eczema Area and Severity Index (EASI) Score From Baseline to Each Study Visit	EASI scoring system is a standardized clinical tool for the assessment of atopic dermatitis that takes into account overall extent of the percent body surface area (% BSA) involved and severity scores for each clinical signs (erythema, induration/papulation, excoriation, and lichenification). Severity scores were graded on a 4-point scale, 0(absent) to 3(severe) for each body regions (head and neck, upper extremities, lower extremities, and trunk). The severity scores for each signs were summed for each region and multiplied by the % BSA area score and by the appropriate proportionality multiplier (for participants >=8 years of age, 0.1 for head, 0.2 upper extremities, 0.3 for trunk and 0.4 for lower extremities) to generate a regional EASI score. The regional EASI scores were then summed to yield the final EASI score. Baseline is defined as latest pre-dose assessment. Percent change from Baseline is Post-Baseline Visit Value minus Baseline, divided by Baseline and multiplied by 100.

Eligibility Module

Eligibility Criteria

Inclusion Criteria

Age between 18 and 70 years of age inclusive, at the time of signing the informed consent.
AD diagnosed by the Eichenfield revised criteria of Hanifin and Rajka.
Diagnosis of AD >=2 years prior to the Screening visit.
An IGA score >=3 at the Screening and Baseline visits.
AD involvement of >=10% body surface area at the Screening and Baseline visits.
EASI score >=16 at the Screening and Baseline visits.
Absolute blood eosinophil count >=350 cells/microliter at the Screening visit.
Applied the same non-prescription, non-medicated (without an active ingredient) emollient twice daily for at least 7 days immediately before the Baseline visit.
Recent history (<=6 months prior to the Screening visit) of inadequate response to a stable regimen of prescription topical medication or for whom prescription topical medications are not tolerated or where there is a concern for potential side effects, such as skin thinning or increased risk of hypothalamic-pituitary-adrenal [HPA] suppression; as well as, inadequate response to optimization of non-pharmacological measures such as moisturizers. Inadequate response to a stable regimen of prescription topical medication (such as medium to high potency topical corticosteroids or topical calcineurin inhibitors) is defined as failure to achieve and maintain remission or low disease activity state (equivalent to an IGA score =0 [clear] to 2 [mild]) despite treatment for the recommended duration as per label or for the maximum duration recommended for the subject treatment, whichever is shorter.
Male or female: A female subject is eligible to participate if she is not pregnant (as confirmed by a negative urine human chorionic gonadotrophin (hCG) test), not lactating, and at least one of the following conditions: Non-reproductive potential- Pre-menopausal females with documented tubal ligation, documented hysteroscopic tubal occlusion procedure with follow-up confirmation of bilateral tubal occlusion, hysterectomy, documented bilateral oophorectomy; and postmenopausal defined as 12 months of spontaneous amenorrhea (in questionable cases a blood sample with simultaneous follicle stimulating hormone [FSH] and estradiol levels consistent with menopause). Females on hormone replacement therapy (HRT) and whose menopausal status is in doubt will be required to use one of the highly effective contraception methods if they wish to continue their HRT during the study. Otherwise, they must discontinue HRT to allow confirmation of post-menopausal status prior to study enrolment. Reproductive potential and agrees to follow one of the options listed in the Modified List of Highly Effective Methods for Avoiding Pregnancy in Females of Reproductive Potential (FRP) from 30 days prior to the first dose of study medication and until 16 weeks after the last dose of study medication.
The investigator is responsible for ensuring that subjects understand how to properly use these methods of contraception.
Subject is able to give signed informed consent that includes compliance with the requirements and restrictions listed in the consent form and in this protocol.

Exclusion Criteria

Other types of eczema.
Any other concomitant skin disorder (e.g., generalized erythroderma such as Netherton's Syndrome, or psoriasis), pigmentation, or extensive scarring that in the opinion of the investigator may interfere with the evaluation of AD lesions or compromise subject safety.
Immunocompromised (e.g., lymphoma, acquired immunodeficiency syndrome, Wiskott-Aldrich Syndrome) or has a history of malignant disease within 5 years before the Baseline visit. Note: Subjects with successfully treated basal cell carcinoma (no more than 3 lesions), squamous cell carcinoma of the skin, or cervical carcinoma in situ, with no evidence of recurrence within the 3 years prior to the Baseline visit may participate in the study.
A positive history for human immunodeficiency virus (HIV) antibody.
Chronic or acute infection requiring treatment with oral or intravenous (IV) antibiotics, antivirals, anti-protozoals, or antifungals within 4 weeks before the Screening visit or anytime between the Screening and Baseline visits.
Superficial skin infections within 1 week before the Screening visit.
Known, pre-existing or suspected parasitic infection within 6 months before the Screening visit.
Other known or suspected conditions that could lead to elevated eosinophils, for example, hypereosinophilic syndromes including eosinophilic granulomatosis with polyangiitis (EGPA, also known as Churg-Strauss Syndrome), eosinophilic esophagitis, or severe asthma.
A history or ongoing serious illness or medical, physical, or psychiatric condition(s) that, in the investigator's opinion, may interfere with the subject's completion of the study.
ALT >2x upper limit of normal (ULN)
Bilirubin >1.5x ULN (isolated bilirubin >1.5xULN 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).
QT Interval Corrected by Fridericia Correction Formula (QTcF) >450 milliseconds (msec) or QTcF >480 msec in subjects with Bundle Branch Block.
Clinically significant abnormality in the hematological or biochemical screen, as judged by the investigator.
Previously treated with mepolizumab or participated in a previous mepolizumab clinical study.
Prior treatment with any of the medications or treatments listed in Table 1 within the indicated periods before the Screening visit.
Prolonged exposure to natural (e.g, sunlight) ultraviolet (UV) radiation within 4 weeks prior to the Baseline visit and/or intention to have such exposure during the study, which is thought by the investigator to potentially impact the subject's AD.
More than 2 visits per week to a tanning booth or parlor in the 4 weeks prior to the Baseline visit.
Onset of a new exercise routine or major change to a previous exercise routine within 2 weeks before randomization, or unwilling to maintain current level of physical activity throughout the length of participation in this study.
History of alcohol or other substance abuse within the last 2 years.
Hypersensitivity to mepolizumab or any of its excipients.
Presence of hepatitis B surface antigen (HBsAg), positive hepatitis C antibody test result at screening or within 3 months prior to first dose of study treatment.
Exposure to more than 4 investigational medicinal products within 12 months prior to the Baseline visit.
Subject is a member of the investigational team or his/her immediate family.

Name	Affiliation	Role
GSK Clinical Trials	GlaxoSmithKline	Study Director

Facility	Status	City	State	ZIP	Country	Contacts
GSK Investigational Site		Fort Smith	Arkansas	72916	United States
GSK Investigational Site

PubMed Identifier	Type	Citation	Retractions
31515809	Background	Kang EG, Narayana PK, Pouliquen IJ, Lopez MC, Ferreira-Cornwell MC, Getsy JA. Efficacy and safety of mepolizumab administered subcutaneously for moderate to severe atopic dermatitis. Allergy. 2020 Apr;75(4):950-953. doi: 10.1111/all.14050. Epub 2019 Oct 9. No abstract available.

ID	Title	Description
FG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
FG001	Mepolizumab 100 mg SC

Type	Includes Protocol	Includes SAP	Includes ICF	Document Label	Document Date	Document Uploaded Date	Document File Name
Prot	Yes	No	No	Study Protocol	Jun 22, 2017	Oct 5, 2018

Type

Title

Description

Population Description

Reporting Status

Anticipated Posting Date

Parameter Type

Dispersion Type

Unit of Measure

Calculate Percentage

Time Frame

Units Analyzed

Denominator Units Selected

Arm/Group Information

Denominators

Classes

Analyses

Primary

Number of Participants With an Investigator's Global Assessment (IGA) Score of 0 or 1 and at Least a 2- Grade Improvement at Week 16

The IGA is a clinical tool for assessing the current state/severity of a participant's atopic dermatitis . It is a static 5-point morphological assessment of overall disease severity determined by the investigator, sub-investigator, or trained healthcare professional with required qualifications on a scale of 0 to 4 where, 0-clear, 1-almost clear, 2-mild, 3-moderate, and 4- severe. Higher score indicates severity of disease. A responder is defined as a participant who had an IGA score of 0 or 1 and a minimum 2-grade improvement from Baseline. Number of participants with IGA score of 0 or 1 and at least a 2- grade improvement at Week 16 was presented.

Intent-to-Treat Population comprised of all participants who were randomized and who received at least one dose of study treatment.

Posted

Count of Participants

Participants

Week 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants	OG00016 OG00118

Title

Denominators

Categories

Title	Measurements
	OG0000 OG0012

Group IDs	Group Description	Statistical Method	Statistical Comment	P-Value	P-Value Comment	Parameter Type	Parameter Value	Dispersion Type	Dispersion Value	Confidence Interval Sides	Confidence Interval %	CI Lower Limit	CI Upper Limit	CI Lower Limit Comment	CI Upper Limit Comment	Estimate Comment	Tested Non-Inferiority	Non-Inferiority Type	Non-Inferiority Comment	Other Analysis Description
OG000 OG001						Proportions Difference	11			2-Sided	90	-1.1	23.3			Difference in Proportions between Mepolizumab 100 mg SC versus Placebo SC has been presented.		Other

Secondary

Mean Percentage Change in Eczema Area and Severity Index (EASI) Score From Baseline to Each Study Visit

EASI scoring system is a standardized clinical tool for the assessment of atopic dermatitis that takes into account overall extent of the percent body surface area (% BSA) involved and severity scores for each clinical signs (erythema, induration/papulation, excoriation, and lichenification). Severity scores were graded on a 4-point scale, 0(absent) to 3(severe) for each body regions (head and neck, upper extremities, lower extremities, and trunk). The severity scores for each signs were summed for each region and multiplied by the % BSA area score and by the appropriate proportionality multiplier (for participants >=8 years of age, 0.1 for head, 0.2 upper extremities, 0.3 for trunk and 0.4 for lower extremities) to generate a regional EASI score. The regional EASI scores were then summed to yield the final EASI score. Baseline is defined as latest pre-dose assessment. Percent change from Baseline is Post-Baseline Visit Value minus Baseline, divided by Baseline and multiplied by 100.

Intent-to-Treat Population. Only those participants with data available at the specified data points were analyzed (represented by n= X in the category titles).

Posted

Mean

Standard Deviation

Percent change

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC

Secondary

Number of Participants With an IGA Score of 0 or 1 and at Least a 2-grade Improvement at Each Study Visit

The IGA is a clinical tool for assessing the current state/severity of a participant's atopic dermatitis . It is a static 5-point morphological assessment of overall disease severity determined by the investigator, sub-investigator, or trained healthcare professional with required qualifications on a scale of 0 to 4 where, 0-clear, 1-almost clear, 2-mild, 3-moderate, and 4- severe. Higher score indicates severity of disease. A Responder is defined as a participant who had an IGA score of 0 or 1 and a minimum 2-grade improvement from Baseline. Participants withdrawn early from the study were assigned to be a non-responder for all weeks after withdrawal. Number of participants with IGA score of 0 or 1 and at least a 2- grade improvement at each study visit (Weeks 4, 8, 12, 16 and 20) is presented.

Intent-to-Treat Population

Posted

Count of Participants

Participants

Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Secondary

Number of Participants With On-treatment Adverse Events (AEs), Serious Adverse Events (SAEs) and Non-serious Adverse Events (nSAEs)

An AE is any untoward medical occurrence in a clinical investigation 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, at any dose 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 and is associated with liver injury or impaired liver function. On-treatment AES were reported on or after treatment start date and on or before treatment stop date (plus 28 days). Number of participants with AEs, SAEs and nSAEs is presented.

Safety Population comprised of all participants who received at least one dose of a study treatment. One participant from Placebo arm received Mepolizumab at Day 1 instead of placebo due to error.

Posted

Count of Participants

Participants

Up to Week 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Secondary

Number of Participants With On-treatment AEs of Special Interest Reported as Local Site Injection Reaction and Systemic Reactions

Safety Population. One participant from Placebo arm received Mepolizumab at Day 1 instead of placebo due to error.

Posted

Count of Participants

Participants

Up to Week 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Hematology Parameters: Basophils, Eosinophils, Leukocytes, Lymphocytes, Monocytes, Neutrophils and Platelets

Blood samples were collected to analyze the hematology parameters: Basophils, Eosinophils, Leukocytes, Lymphocytes, Monocytes, Neutrophils and Platelets. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Safety Population. Only those participants with data available at the specified data points were analyzed (represented by n= X in the category titles). One participant from Placebo arm received Mepolizumab at Day 1 instead of placebo due to error.

Posted

Mean

Standard Deviation

Billion cells per liter (10^9/L)

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts

Secondary

Change From Baseline in Hematology Parameter: Erythrocytes Mean Corpuscular Hemoglobin

Blood samples were collected to analyze the hematology parameter: Erythrocytes Mean Corpuscular Hemoglobin. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Picograms

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Hematology Parameter: Erythrocytes Mean Corpuscular Volume

Blood samples were collected to analyze the hematology parameter: Erythrocytes Mean Corpuscular Volume. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Femtoliter

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Hematology Parameter: Erythrocytes

Blood samples were collected to analyze the hematology parameter: Erythrocytes. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Trillion cells/liter (10^12 cell/L)

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Hematology Parameter: Hematocrit

Blood samples were collected to analyze the hematology parameter: Hematocrit. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Percentage of red blood cells in blood

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Hematology Parameter: Hemoglobin

Blood samples were collected to analyze the hematology parameter: Hemoglobin. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Grams per liter

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

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

Blood samples were collected to analyze the chemistry parameters: ALT, ALP and AST . Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

International units per liter (IU/L)

Baseline (Day 1) and Weeks 4, 8, 12, and 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Chemistry Parameters: Albumin and Protein

Blood samples were collected to analyze the chemistry parameters: Albumin and Protein. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Grams per liter

Baseline (Day 1) and Weeks 4, 8, 12, and 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Chemistry Parameters: Bilirubin, Creatinine, Direct Bilirubin

Blood samples were collected to analyze the chemistry parameters: Bilirubin, Creatinine and Direct Bilirubin. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Micromoles per liter

Baseline (Day 1) and Weeks 4, 8, 12, and 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Chemistry Parameters: Calcium, Glucose, Potassium, Sodium and Urea

Blood samples were collected to analyze the chemistry parameters: Calcium, Glucose, Potassium, Sodium and Urea. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Millimoles per liter (mmol/L)

Baseline (Day 1) and Weeks 4, 8, 12, and 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Number of Participants With Worst Post Baseline Potential Clinical Importance (PCI) Value for Hematology Parameters

Blood samples were collected from participants for analysis of following hematology parameters; hematocrit, hemoglobin, leukocytes and platelets. PCI ranges were < 0.201 or >0.599 proportion of red blood cells in blood for hematocrit, <71 or >199 grams per liter for hemoglobin, <31 or >1499 Giga cells per liter for platelets and for leukocytes < 1.1 Giga cells per liter. Participants were counted in the worst case category that their value changes to (low, normal or high), unless there is no change in their category. Participants with laboratory value category "To Low" and "To High" were presented. Only those parameters having worst post-Baseline PCI values were presented. Day 1 was considered as Baseline.

Safety Population. Only those participants with available data at the specified time points were analyzed. One participant from Placebo arm received Mepolizumab at Day 1 instead of placebo due to error.

Posted

Count of Participants

Participants

Up to Week 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Secondary

Number of Participants With Worst Post Baseline PCI Value for Chemistry Parameters

Blood samples were collected from participants for analysis of following clinical chemistry parameters: ALT, Calcium, glucose, Potassium and sodium. PCI ranges were >143 units per liter (U/L) for ALT (Age category: 3-12 years) and >239 U/L for ALT (Age category: 13+ years), <1.50 or >3.24 mmol/L for calcium, < 2.2 or > 27.8 mmol/L for glucose, <2.8 or >6.5 mmoL/L for potassium , and <120 or >160 mmoL/L for sodium. Participants were counted in the worst case category that their value changes to (low, normal , or high), unless there is no change in their category. Participants whose laboratory value category was unchanged (e.g., High to High), or whose value became within range, were recorded in the "To within Range or No Change" category. Only those parameters having worst post-Baseline PCI values were presented. Day 1 was considered as Baseline.

Posted

Count of Participants

Participants

Up to Week 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Secondary

Change From Baseline in PR Interval, QRS Duration, QT Interval and QT Interval Corrected for Heart Rate According to Fridericia's Formula (QTcF)

Triplicate 12-lead electrocardiograms (ECG) were obtained to measure PR Interval, QRS Duration, QT Interval and QTcF Interval. Screening was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Milliseconds

Baseline (Screening) and Weeks 4, 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

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

SBP and DBP were measured in semi-supine position after 5 minutes rest for the participants at indicated time points. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Millimeters of mercury (mmHg)

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Vital Signs: Pulse Rate

Pulse rate was measured in semi-supine position after 5 minutes rest for the participants at indicated time points. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Beats per minute

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Change From Baseline in Vital Signs: Temperature

Temperature was measured in semi-supine position after 5 minutes rest for the participants at indicated time points. Day 1 was considered as Baseline. Change from Baseline was calculated by subtracting Baseline value from the specified time point value.

Posted

Mean

Standard Deviation

Celsius

Baseline (Day 1) and Weeks 4, 8, 12, 16 and 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts
Participants

Secondary

Number of Participants With Worst Post Baseline PCI Value for Vital Signs

Blood samples were collected from participants for analysis of following vital signs parameters: DBP, Pulse rate and SBP. PCI ranges were <85 or >160 mmHg for SBP, <45 or >100 mmHg for DBP and < 40 or > 110 beats per minute for Pulse rate. Participants were counted in the worst case category that their value changes to (low, within range or no change, or high), unless there is no change in their category. Participants with vital signs value category "To Low" and "To High" were presented. Only those parameters having worst post-Baseline PCI values are presented. Day 1 was considered as Baseline.

Posted

Count of Participants

Participants

Up to Week 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Secondary

Number of Participants With Abnormal Findings for ECG Parameters

Triplicate 12-lead ECG were obtained to measure ECG parameters. Abnormal findings were categorized as clinically significant (CS) and not clinically significant (NCS). 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

Week 4 and Week 16

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Units	Counts

Secondary

Number of Participants With Any Time Post Baseline Anti-mepolizumab Binding Antibodies and Neutralizing Antibodies Response

Blood samples were collected for the determination of anti-mepolizumab antibodies at the specified visits. The number of participants with anti-mepolizumab binding antibodies and neutralizing antibodies response at Any Time Post Baseline has been presented. Neutralizing antibodies response assay result have been only presented for participants with positive anti-drug antibody assay. Day 1 was considered as Baseline.

Posted

Count of Participants

Participants

Up to Week 20

ID	Title	Description
OG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
OG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.

Term	Organ System	Source Vocabulary	Assessment Type	Statistical Information
Furuncle	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Herpes simplex	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Hordeolum	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Impetigo	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0000 events0 affected15 at risk EG0011 events1 affected19 at risk
Localised infection	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Staphylococcal infection	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Staphylococcal skin infection	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Streptococcal infection	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Upper respiratory tract infection	Infections and infestations	MedDRA 21.0	Systematic Assessment	EG0002 events1 affected15 at risk EG0010 events0 affected19 at risk
Diarrhoea	Gastrointestinal disorders	MedDRA 21.0	Systematic Assessment	EG0002 events2 affected15 at risk EG0010 events0 affected19 at risk
Arthralgia	Musculoskeletal and connective tissue disorders	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Dizziness	Nervous system disorders	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk
Skin plaque	Skin and subcutaneous tissue disorders	MedDRA 21.0	Systematic Assessment	EG0001 events1 affected15 at risk EG0010 events0 affected19 at risk

ID	Term
D012873	Skin Diseases, Genetic
D030342	Genetic Diseases, Inborn
D009358	Congenital, Hereditary, and Neonatal Diseases and Abnormalities
D003872	Dermatitis
D012871	Skin Diseases
D017437	Skin and Connective Tissue Diseases
D017443	Skin Diseases, Eczematous
D006969	Hypersensitivity, Immediate
D006967	Hypersensitivity
D007154	Immune System Diseases

ID	Title	Description
BG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
BG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.
BG002	Total	Total of all reporting groups

ID	Title	Description	Deaths (Affected)	Deaths (At Risk)	Serious Events (Affected)	Serious Events (At Risk)	Other Events (Affected)	Other Events (At Risk)
EG000	Placebo SC	Participants received placebo (0.9 percent sodium chloride solution) SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.	0	15	0	15	7	15
EG001	Mepolizumab 100 mg SC	Participants received 100 milligram (mg) of Mepolizumab SC injection administered into the upper arm, abdomen, or thigh every 4 weeks.	0	19	0	19	1	19