A Study to Evaluate Different Dose Levels of GlaxoSmithKline (GSK) Biologicals' Investigational Respiratory Syncytial Virus (RSV) Vaccine (GSK3888550A), Based on the Vaccine Safety and the Antibodies (Body Defences) Produced Following Vaccine Administration, When Given to Healthy Non-pregnant Women

Study Overview
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Brief Summary
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The purpose of this study is to evaluate different dose levels of the investigational RSV maternal vaccine (GSK3888550A) based on safety/reactogenicity and immune response data. As this is the first time the investigational RSV maternal vaccine (GSK3888550A) is being been used in humans, this study will be performed in healthy non-pregnant women 18-45 years of age before testing in pregnant women.

Detailed Description
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Healthy non-pregnant women 18-45 years of age will be randomized in a 1:1:1:1 ratio to receive one of three dose levels (30, 60, 120 micrograms [µg]) of the investigational RSV maternal vaccine (GSK3888550A) or placebo, administered as a single intramuscular injection (IM). There will be a screening visit and five study visits scheduled at Day 1 (study vaccination), Day 8, Day 31, Day 61, and Day 91 to evaluate the primary and secondary objectives of safety/reactogenicity and immunogenicity profiles of the 3 dose levels. Subjects will also be contacted at Day 181. During this contact, the investigator (or delegate) will ask the subject if she has experienced any serious adverse events (SAEs) and or any adverse events (AEs) leading to study withdrawal since the last study visit (Day 360), as well as if she has become pregnant during the post-vaccination period. The investigator (or delegate) will also ask the subject about concomitant vaccinations/products/medications that she has received since the last study visit (D91). Contact should be performed preferably via telephone. Other means of contact (email/other) may be acceptable provided the required information can be fully collected.

Official Title
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A Study to Evaluate the Safety, Reactogenicity and Immunogenicity of GSK Biologicals' Investigational Unadjuvanted RSV Maternal Vaccine Compared to Placebo When Administered to Healthy Non-pregnant Women.

Conditions
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Respiratory Syncytial Virus Infections

Intervention / Treatment
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* Biological: GSK3888550A RSV Maternal vaccine formulation 1
* Biological: GSK3888550A RSV Maternal vaccine formulation 2
* Biological: GSK3888550A RSV Maternal vaccine formulation 3
* Drug: Placebo (Normal Saline)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subjects who the investigator believes will comply with the requirements of the protocol (e.g. completion of the diary cards/questionnaires, return for follow-up visits, have regular contact to allow evaluation during the study); Written informed consent obtained from the subject; Healthy female subjects; as established by medical history and clinical examination, aged 18 to 45 years at the time of the vaccination; Female subjects of childbearing potential may be enrolled in the study, if the subject: has practiced adequate contraception for 30 days prior to vaccination, and has a negative pregnancy test on the day of vaccination, and has agreed to continue adequate contraception until 90 days after vaccination Exclusion Criteria: Use of any investigational or non-registered product other than the study vaccine within 30 days preceding vaccination or any planned use during the study period; Concurrently participating in the active phase of another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational vaccine/product Chronic administration (defined as more than 14 days in total) of immunosuppressant or other immune-modifying drugs, as well as administration of long acting immune modifying drugs, within 6 months prior to the vaccine dose (for corticosteroids, this will mean prednisone higher than or equal to (≥) 5 milligrams per day (mg/day), or equivalent). Inhaled and topical steroids are allowed; Administration of immunoglobulins and/or any blood products during the period starting 3 months before the study vaccination, or planned administration until 90 days post-vaccination; Planned administration/administration of a vaccine not foreseen by the study protocol within the period starting 30 days before and ending 30 days after study vaccination, with the exception of any licensed influenza vaccine which may be administered ≥ 15 days before or after study vaccination; Previous experimental vaccination against RSV; Presence of neurological or psychiatric diagnoses which, although stable, are deemed by the investigator to render the potential subject unable/unlikely to provide accurate safety reports; Family history of congenital or hereditary immunodeficiency; Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination; History of allergic disease or reactions likely to be exacerbated by any component of the vaccine; Any acute or chronic, clinically significant disease, as determined by physical examination, laboratory screening tests, subject personal report and/or health care provider information. The following conditions will be exclusionary: Diabetes mellitus, Respiratory diseases, such as: Chronic Pulmonary diseases, including Chronic Obstructive Pulmonary Disease (COPD), Bronchopulmonary dysplasia (note: history of past bronchopulmonary dysplasia as a neonate/infant will not be exclusionary), Uncontrolled asthma or asthma necessitating treatment with chronic systemic glucocorticoids Significant and/or uncontrolled psychiatric illness: hospitalization for psychiatric illness, history of suicide attempt(s) or confinement for danger to self or others within 10 years clinically significant depression Major neurological disease including: seizure or adulthood epilepsy (note: history of febrile convulsion in childhood is not exclusionary) myasthenia gravis history of repetitive migraine mal/status migrainosus Significant cardiovascular disease, including: Uncontrolled arterial hypertension, Congenital heart disease (with the exception of corrected atrial or ventricular septal defects), Previous myocardial infarction, Valvular heart disease or history of rheumatic fever, Previous bacterial endocarditis, History of cardiac surgery (with the exception of corrected atrial or ventricular septal defects), Personal or family history of cardiomyopathy or sudden adult death. Known or suspected Hepatitis B or Hepatitis C infection, Any other significant uncontrolled medical illness, defined as any illness requiring new medical and/or surgical treatment or significant modification of treatment dose due to uncontrolled symptoms or drug toxicity, within 3 months prior to study vaccination. History of or current autoimmune disease; Body mass index (BMI) > 40 Kilograms (kg)/square meters(m^2); Pregnant or lactating female; Female planning to become pregnant or planning to discontinue contraceptive precautions; Hypersensitivity to latex; Lymphoproliferative disorder or malignancy within previous 5 years; Acute disease and/or fever at the time of enrolment; Fever is defined as temperature ≥ 38°C/100.4°F For subjects with acute disease and/or fever at the time of enrolment, Visit 1 will be rescheduled within the allowed window for the visit. Subjects with fever at screening may be re-screened 1 time at a later date. Subjects with a minor illness (such as mild diarrhoea, mild upper respiratory infection) without fever may be enrolled at the discretion of the investigator. Any clinically significant or any ≥ Grade 2* haematological (haemoglobin level, white blood cell, lymphocyte, neutrophil, eosinophil, and platelets) and biochemical (alanine aminotransferase [ALT] aspartate aminotransferase [AST], creatinine, blood urea nitrogen [BUN]) laboratory abnormality detected at the last screening blood sampling; *Grading of laboratory parameters will be based on the FDA Guidance for Industry Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials. For Grade 1 laboratory abnormalities, the investigator should use clinical judgement to decide which ones are clinically relevant. Subjects with haematological/biochemical values out of normal range at screening which are expected to be temporary, may be re-screened 1 time at a later date. Any other condition that the investigator judges may interfere with study procedures or findings; Any medical condition that in the judgment of the investigator would make intramuscular injection unsafe; Alcoholism, drug abuse and/or use disorder within the past two years (as defined in Diagnostic and Statistical Manual of Mental Disorders [DSM-5] Diagnostic Criteria); Planned move to a location that will prohibit participating in the trial until study end.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: RSV MAT formulation 1 Group<br>Subjects received a single dose (30 µg) injection of the investigational RSV maternal vaccine (GSK3888550A) at Day 1, intramuscularly into the deltoid region of the non-dominant arm | Biological: GSK3888550A RSV Maternal vaccine formulation 1<br>* Single dose administered intramuscularly at Day 1 in the deltoid region of the non-dominant arm<br>|
| Experimental: RSV MAT formulation 2 Group<br>Subjects received a single dose (60 µg) injection of the investigational RSV maternal vaccine (GSK3888550A) at Day 1, intramuscularly into the deltoid region of the non-dominant arm | Biological: GSK3888550A RSV Maternal vaccine formulation 2<br>* Single dose administered intramuscularly at Day 1 in the deltoid region of the non-dominant arm<br>|
| Experimental: RSV MAT formulation 3 Group<br>Subjects received a single dose (120 µg) injection of the investigational RSV maternal vaccine (GSK3888550A) at Day 1, intramuscularly into the deltoid region of the non-dominant arm | Biological: GSK3888550A RSV Maternal vaccine formulation 3<br>* Single dose administered intramuscularly at Day 1 in the deltoid region of the non-dominant arm<br>|
| Placebo Comparator: Control Group<br>Subjects received a single placebo saline injection at Day 1, intramuscularly into the deltoid region of the non-dominant arm | Drug: Placebo (Normal Saline)<br>* Single dose administered intramuscularly at Day 1 in the deltoid region of the non-dominant arm<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Subjects With Any and Grade 3 Solicited Local Adverse Events (AE) During a 7-day Follow-up Period | Assessed solicited local symptoms include pain, redness and swelling, at the injection site. Any = occurrence of the AE regardless of intensity grade. Any Redness and swelling symptom = symptom reported with a surface diameter greater than 20 millimeters. Grade 3 pain = significant pain at rest, pain that prevented normal every day activity. Grade 3 redness/swelling = symptom reported with a surface diameter greater than 100 millimeters. | During a 7-day follow-up period (i.e., on the day of vaccination and 6 subsequent days) | 
| Number of Subjects With Any, Grade 3 and Related Solicited General Adverse Events (AE) During a 7-day Follow-up Period | Assessed solicited general symptoms include fatigue, gastrointestinal symptoms (nausea, vomiting, diarrhea and/or abdominal pain), headache and fever. Any Fatigue, gastrointestinal symptoms and headache = occurrence of the symptom regardless of intensity grade and relationship. Any Fever = temperature higher than or equal to 38.0 degrees Celsius (°C), or 100.4 degrees Fahrenheit (°F). Grade 3 Fatigue, gastrointestinal symptoms and headache = symptoms that prevented normal activities. Grade 3 Fever = temperature higher than 39.0 degrees Celsius (°C), or 102.2 degrees Fahrenheit (°F). Related fatigue, gastrointestinal symptoms, headache and fever(>38°C) = symptoms assessed by the investigator as related to the vaccination. | During a 7-day follow-up period (i.e., on the day of vaccination and 6 subsequent days) | 
| Number of Subjects With Any Unsolicited AEs During a 30-day Follow-up Period | An unsolicited AE covers any untoward medical occurrence in a clinical investigation subject temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product and reported in addition to those solicited during the clinical study and any solicited symptom with onset outside the specified period of follow-up for solicited symptoms. Any is defined as the occurrence of any unsolicited AE regardless of intensity grade or relation to vaccination. | During a 30-day follow-up period after vaccination (i.e., on the day of vaccination and 29 subsequent days) | 
| Number of Subjects With Serious Adverse Events (SAEs) During a 30-day Follow-up Period | Assessed SAEs include any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, or results in disability/incapacity, or is a congenital anomaly/birth defect in the offspring of a study subject. | From Day 1 (vaccination) up to Day 30 (i.e., on the day of vaccination and 29 subsequent days) | 
| Number of Subjects With Hematological Laboratory Results Change With Respect to Normal Laboratory Ranges and Versus Baseline, at Day 8 | Assessed hematological laboratory parameters include Eosinophils, Hemoglobin, Lymphocytes, Neutrophils, Platelets, White blood cells (WBC). Hematological abnormalities refer to range indicator at timing, categorized as BELOW, WITHIN or ABOVE normal ranges, and compared to baseline range indicator i.e. BELOW(SCR), WITHIN(SCR) or ABOVE(SCR). [e.g. WBC, BELOW(SCR), BELOW = WBC BELOW normal ranges at baseline versus BELOW normal ranges at Day 8]. | At Day 8 | 
| Number of Subjects With Hematological Laboratory Results Change With Respect to Normal Laboratory Ranges and Versus Baseline, at Day 31 | Assessed hematological laboratory parameters include Eosinophils, Hemoglobin, Lymphocytes, Neutrophils, Platelets, White blood cells (WBC). Hematological abnormalities refer to range indicator at timing, categorized as BELOW, WITHIN or ABOVE normal ranges, and compared to baseline range indicator i.e. BELOW(SCR), WITHIN(SCR) or ABOVE(SCR) [e.g. WBC, BELOW(SCR), BELOW = WBC BELOW normal ranges at baseline versus BELOW normal ranges at Day 31]. | At Day 31 | 
| Number of Subjects With Biochemical Laboratory Results Change With Respect to Normal Laboratory Ranges and Versus Baseline, at Day 8 | Assessed biochemical laboratory parameters include alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN) and creatinine. Biochemical abnormalities refer to range indicator at timing, categorized as BELOW, WITHIN or ABOVE normal ranges, and compared to baseline range indicator i.e. BELOW(SCR), WITHIN(SCR) or ABOVE(SCR)[e.g. ALT, BELOW(SCR), BELOW = ALT BELOW normal ranges at baseline versus BELOW normal ranges at Day 8]. | At Day 8 | 
| Number of Subjects With Biochemical Laboratory Results Change With Respect to Normal Laboratory Ranges and Versus Baseline, at Day 31 | Assessed biochemical laboratory parameters include alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatinine and blood urea nitrogen (BUN). Biochemical abnormalities refer to range indicator at timing, categorized as BELOW, WITHIN or ABOVE normal ranges, and compared to baseline range indicator i.e. BELOW(SCR), WITHIN(SCR) or ABOVE(SCR) [e.g. ALT, BELOW(SCR), BELOW = ALT BELOW normal ranges at baseline versus BELOW normal ranges at Day 31]. | At Day 31 | 
| Number of Subjects With Hematological Laboratory Results Versus Baseline, by Maximum Grading, at Day 8 | Assessed hematological laboratory parameters include Eosinophils, Hemoglobin, Lymphocytes Decrease, Neutrophils Decrease, Platelets Decrease, WBC Decrease and WBC Increase, as graded by the Food and Drug Administration [FDA] Guidance for Industry Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials. Assessed grades at specified time point, are Grade 1 = mild, Grade 2 = moderate, Grade 3 = severe and Grade 4 = life threatening, as compared to the baseline status of the same parameter, at baseline [e.g. WBC decrease-Grade 1(SCR)-Grade 1 = WBC decrease Grade 1 at baseline versus Grade 1 at Day 8]. Any corresponding to any grade and Grade 0 to normal ranges. | At Day 8 | 
| Number of Subjects With Hematological Laboratory Results Versus Baseline, by Maximum Grading, at Day 31 | Assessed hematological laboratory parameters include Eosinophils, Hemoglobin, Lymphocytes Decrease, Neutrophils Decrease, Platelets Decrease, WBC Decrease and WBC Increase, as graded by the Food and Drug Administration [FDA] Guidance for Industry Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials. Assessed grades at specified time point, are Grade 1 = mild, Grade 2 = moderate, Grade 3 = severe and Grade 4 = life threatening, as compared to the baseline status of the same parameter, at baseline [e.g. WBC decrease-Grade 1(SCR)-Grade 1 = WBC decrease Grade 1 at baseline versus Grade 1 at Day 31]. Any corresponding to any grade and Grade 0 to normal ranges. | At Day 31 | 
| Number of Subjects With Biochemical Laboratory Results Versus Baseline, by Maximum Grading, at Day 8 | Assessed biochemical laboratory parameters include alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN) and creatinine, as graded by the Food and Drug Administration [FDA] Guidance for Industry Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials. Assessed grades at specified time point, are Grade 1 = mild, Grade 2 = moderate, Grade 3 = severe and Grade 4 = life threatening, as compared to the baseline status of the same parameter, at baseline [e.g. ALT-Grade 1(SCR)-Grade 1 = ALT Grade 1 at baseline versus Grade 1 at Day 8]. Any corresponding to any grade and Grade 0 to normal ranges. | At Day 8 | 
| Number of Subjects With Biochemical Laboratory Results Versus Baseline, by Maximum Grading, at Day 31 | Assessed biochemical laboratory parameters include alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN) and creatinine, as graded by the Food and Drug Administration [FDA] Guidance for Industry Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials. Assessed grades at specified time point, are Grade 1 = mild, Grade 2 = moderate, Grade 3 = severe and Grade 4 = life threatening, as compared to the baseline status of the same parameter, at baseline [e.g. ALT-Grade 1(SCR)-Grade 1 = ALT Grade 1 at baseline versus Grade 1 at Day 31]. Any corresponding to any grade and Grade 0 to normal ranges. | At Day 31 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Subjects With SAEs | Assessed SAEs include any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, or results in disability/incapacity, or is a congenital anomaly/birth defect in the offspring of a study subject. | From Day 1 (vaccination) up to Day 91 and up to Day 181 | 
| Neutralizing Antibody (Nab) Titers Against RSV Serotype A | Anti RSV-A neutralizing antibody titers are given as geometric mean titers (GMTs) and expressed as Estimated Dose: serum dilution giving a 60% reduction of the signal compared to a control without serum (ED60), calculated on subjects with anti-RSV-A neutralizing antibody titer equal to or above the assay cut-off 18 ED60. | At pre-vaccination at screening (PRE), 7 days post vaccination (Day 8), 30 days post vaccination (Day 31), 60 days post vaccination (Day 61) and 90 days post vaccination (Day 91) | 
| Anti-RSVPreF3 Immunoglobulin G (IgG) Antibody Concentrations | Concentrations are presented as geometric mean concentrations (GMCs), expressed in Enzyme Linked Immunosorbent Assay (ELISA) units per millilitre (EL.U/mL), calculated on subjects with anti-RSVPreF3 antibody concentration equal to or above the assay cut-off 25 EL.U/mL. | At pre-vaccination at screening (PRE), 7 days post vaccination (Day 8), 30 days post vaccination (Day 31), 60 days post vaccination (Day 61) and 90 days post vaccination (Day 91) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Safety, Vaccines, Immunogenicity, Reactogenicity, Respiratory Syncytial Viruses