Efficacy and Safety Study of Mepolizumab 100 Milligram (mg) Subcutaneous (SC) in Indian Participants Aged Greater Than or Equal to (>=) 18 Years With Severe Eosinophilic Asthma (PRISM)

This is an interventional treatment trial for Asthma focused on measuring Mepolizumab, Oral corticosteroids, Prednisolone, Prednisone, Severe Eosinophilic asthma Read More

Inclusion Criteria:

• Subject must be 18 to 65 years of age inclusive, at the time of signing the informed consent.
• Asthma: Evidence of asthma as documented by either: (a) Airway reversibility (FEV1>=12% and 200 milliliter (ml) demonstrated at Visit 1, Visit 2 or Visit 3 OR documented in the previous 12 months OR (b) Airway hyperresponsiveness (methacholine: PC20 of <8mg/mL or histamine: PD20 of <7.8 μmol; mannitol: decrease in FEV1 as per the labelled product instructions) documented in the 12 months prior to Visit 3 OR (c) Airflow variability in clinic FEV1 >=20% between two consecutive clinic visits documented in the 12 months prior to Visit 3 (FEV1 recorded during an exacerbation should not be considered for this criteria) OR (d) Airflow variability as indicated by >20% diurnal variability in peak flow observed on 3 or more days during the optimization period.
• Subjects with Eosinophilic asthma: prior documentation of eosinophilic asthma or high likelihood of eosinophilic asthma as FEV1: Persistent airflow obstruction as indicated by: (a) For subjects >=18 years of age at Visit 1, Visit 2, or Visit 3, a pre-bronchodilator FEV1 <80% predicted. (b) For subjects 12 to 17 years of age at Visit 1, Visit 2, or Visit 3, a pre-bronchodilator FEV1 <90% predicted OR FEV1:Forced expiratory volume (FVC) ratio < 0.8. For predicted FEV1 values National Health and Nutrition Examination Survey (NHANES) III values will be used and adjustments to these values will be made for race.
• Eosinophilic Phenotype: Airway inflammation characterized as eosinophilic in nature as indicated by one of the following characteristics: (a) An elevated peripheral blood eosinophil level of >=300 cells/microliter(μL) that is related to asthma within the previous 12 months prior to Visit 3. OR (b) Peripheral baseline eosinophil level >=150 cells/μL between Visit 1 and Visit 3 that is related to asthma.
• Systemic Corticosteroids: Subjects with severe asthma and requirement for regular treatment with maintenance systemic corticosteroids in the 6 months prior to Visit 1 and using a stable oral corticosteroid dose for 4 weeks prior to Visit 1. Subjects must be taking 5.0 to 35 mg/day of prednisone or equivalent at Visit 1 and must agree to switch to study required prednisone/prednisolone as their oral corticosteroid and use it per protocol for the duration of the study.
• Inhaled Corticosteroids: requirement for regular treatment with high dose inhaled corticosteroid in the 6 months prior to Visit 1. For 18 years of age and older: Inhaled corticosteroids (ICS) dose must be >=880 microgram (mcg)/day fluticasone propionate (FP) (ex-actuator) or equivalent daily. For ages 12 to 17: ICS dose must be >=440 μg/day fluticasone propionate (FP) (ex-actuator) or equivalent daily.
• Controller Medication: Current treatment with an additional controller medication for at least 3 months OR having used and failed an additional controller medication for at least 3 successive months during the prior 12 months [e.g., long-acting beta2-agonist (LABA), leukotriene receptor antagonist (LTRA), or theophylline].
• Male or eligible female. Contraceptive use by women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies. A female subject is eligible to participate if she is not pregnant or breastfeeding, and at least one of the following conditions applies: (a) Is not a woman of childbearing potential (WOCBP) OR (b) Is a WOCBP and using a contraceptive method that is highly effective, with a failure rate of <1% during the intervention period and for at least 16 weeks after the last dose of study intervention. The investigator should evaluate the effectiveness of the contraceptive method in relationship to the first dose of study intervention. (c) A WOCBP must have a negative highly sensitive pregnancy test (serum) within 8 weeks before the first dose of study intervention. (d) Additional requirements for pregnancy testing during and after study intervention are located. (e) The investigator is responsible for review of medical history, menstrual history, and recent sexual activity to decrease the risk for inclusion of a woman with an early undetected pregnancy.
• Capable of giving signed informed consent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol. Induction phase inclusion criteria: - Optimized OCS dose: Achieved a stable dose of OCS during the optimisation period, which is defined as 2 weeks on the same dose of oral corticosteroids prior to entering the Induction Phase. The optimised dose must be between 5.0 and 35mg/day of OCS.
• Eosinophilic asthma: Prior documentation of eosinophilic asthma or high likelihood of eosinophilic asthma.
• OCS Compliance: Compliance with use of OCS dose as instructed during the Optimization Phase on at least 10 of the prior 14 days.
• eDiary Compliance: Compliance with completion of the eDiary defined as: (a) Completion of symptom scores on 4 or more days out of the last 7 days. (b) Completion of information relating to rescue medication use on 4 or more days out of the last 7 days immediately preceding Visit 3. (c) Completion of PEF measurements on 4 or more days out of the last 7 days immediately preceding Visit 3.

Exclusion Criteria:

• Concurrent Respiratory Disease: Presence of a clinically important lung condition other than asthma. This includes but is not limited to current infection, bronchiectasis, pulmonary fibrosis, bronchopulmonary aspergillosis, or diagnoses of emphysema or chronic bronchitis (chronic obstructive pulmonary disease other than asthma) or a history of lung cancer.
• Malignancy: A current malignancy or previous history of cancer in remission for less than 12 months prior screening (Subjects who had localized carcinoma (i.e. basal or squamous cell) of the skin which was resected for cure will not be excluded).
• Liver Disease: Unstable liver disease (as defined by the presence of ascites, encephalopathy, coagulopathy, hypoalbuminaemia, esophageal or gastric varices or persistent jaundice), cirrhosis, and known biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).
• Cardiovascular: Subjects who have severe or clinically significant cardiovascular disease uncontrolled with standard treatment. Including but not limited to: (a) known ejection fraction of <30% OR (b) severe heart failure meeting New York Heart Association Class IV OR (c) hospitalized in the 12 months prior to Visit 1 for severe heart failure meeting New York Heart Association Class III OR (d) angina diagnosed less than 3 months prior to Visit 1 or at Visit 1.
• Other Concurrent Medical Conditions: Subjects who have known, pre-existing, clinically significant endocrine, autoimmune, metabolic, neurological, renal, gastrointestinal, hepatic, haematological or any other system abnormalities that are uncontrolled with standard treatment.
• Eosinophilic Diseases: Subjects with other conditions that could lead to elevated eosinophils such as Hypereosinophilic Syndromes, including Churg-Strauss Syndrome, or Eosinophilic Esophaghitis. Subjects with a known, pre-existing parasitic infestation within 6 months prior to Visit 1 are also to be excluded.
• Omalizumab Use: Subjects who have received omalizumab within 130 days of Visit 1.
• Other Monoclonal Antibodies: Subjects who have received any monoclonal antibody (other than omalizumab) to treat inflammatory disease within 5 half-lives of Visit 1.
• Investigational Medications: Subjects who have received treatment with an investigational drug within the past 30 days or five terminal phase half-lives of the drug whichever is longer, prior to Visit 1 (this also includes investigational formulations of marketed products).
• Subjects who have previously participated in any study of mepolizumab and received Investigational Product (including placebo).
• ECG: ECG assessment QTcF > 450msec or QTcF > 480 msec for subjects with Bundle Branch Block.
• Immunodeficiency: A known immunodeficiency (e.g. human immunodeficiency virus - HIV), other than that explained by the use of corticosteroids taken as therapy for asthma.
• Smoking history: Current smokers or former smokers with a smoking history of >=10 pack years. A former smoker is defined as a subject who quit smoking at least 6 months prior to Visit 1.
• Hypersensitivity: Subjects with a known allergy or intolerance to a monoclonal antibody or biologic.
• Pregnancy: Subjects who are pregnant or breastfeeding. Patients should not be enrolled if they plan to become pregnant during the time of study participation.
• Alcohol/Substance Abuse: A history (or suspected history) of alcohol misuse or substance abuse within 2 years prior to Visit 1.
• Adherence: Subjects who have known evidence of lack of adherence to controller medications and/or ability to follow physician's recommendations.
• Laboratory abnormality: Evidence of clinically significant abnormality in the haematological, biochemical or urinalysis screen at Visit 1, as judged by the investigator.
• Alanine transferase (ALT) >2 x upper limit of normal (ULN).
• Bilirubin > 1.5 x ULN (isolated bilirubin>1.5 ULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).
• Cirrhosis or current unstable liver or biliary disease per investigator assessment defined by the presence of ascites, encephalopathy, coagulopathy, hypoalbuminaemia, oesophageal or gastric varices, or persistent jaundice. Stable non-cirrhotic chronic liver disease (including Gilbert's syndrome, asymptomatic gallstones, and chronic stable hepatitis B or C e.g., presence of hepatitis B surface antigen [HBsAg] or positive hepatitis C antibody test result) is acceptable if the subject otherwise meets eligibility criteria.