Safety and Immunogenicity of Recombinant RSV Vaccine (CHO Cell) in Healthy Subjects Aged 18 Years and Above

A Phase I/II, Single Center, Randomized, Double-Blinded, Placebo-Controlled Clinical Trial to Evaluate the Safety and Immunogenicity of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cell) in Healthy Subjects Aged 18 Years and Above

The purpose of this study is to assess the safety and immunogenicity of two dose levels of the single dose Recombinant RSV vaccine(CHO cells), when administered intramuscularly (IM) in healthy adults aged 18 years and older.

Study Overview

• Status: Active, not recruiting
• Conditions: Respiratory Syncytial Virus (RSV)
• Intervention / Treatment: Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose); Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose); Biological: Placebo (Saline solution)

Detailed Description

A total of 522 subjects in the phase 1/2 study will be enrolled. The study will be conducted in 2 parts (phase 1 for dose escalation and phase 2 for expansion), with first evaluation of safety of 2 two dose levels of Recombinant RSV vaccine(CHO cells) in healthy participants aged 18-59 and ≥60 in phase 1 before preceding with vaccination of the participants aged 50-59 and ≥60 in phase 2. To ensure the safety of the study participants, phase 1 will follow a staggered enrolment with 3 steps. All subjects in each age group in phase 1 will be randomly receive the investigational vaccine(half or full dose) and the placebo in a 2:1 ratio, while all subjects in each age group in phase 2 will be randomly receive the half dose vaccine, the full dose vaccine and the placebo in a 1:1:1 ratio.

• Study Type: Interventional
• Enrollment (Estimated): 522
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• China
  • Henan
    • Shangqiu, Henan, China, 476000
      • Liangyuan District Center for Disease Prevention and Control

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

1. A male or female, in the opinion of the investigator, aged 18 and older for phase 1 and aged 50 and older for phase 2 at the time of the enrollment;
2. Be able to understand the trial procedures, risks and benefits and voluntarily agree to participate in the study and signed an informed consent;
3. Be able to participate in all scheduled visits and comply with the protocol requirements;
4. Women of childbearing potential are willing to use effective contraception (e.g. oral contraceptives, injectable progestogen, implants of levonorgestrel, percutaneous contraceptive patches, intrauterine device (IUD), female and male sterilization, abstinence, condoms, or diaphragms), and the rhythm method, withdrawal and emergency contraception pills are not acceptable;
5. Subjects with stable conditions considered by the investigator.

Exclusion Criteria:

1. Axillary temperature>37.0℃;
2. History of RSV infection within 6 months before enrollment;
3. New onset of respiratory tract infection symptoms like cough, sputum, shortness of breath, wheezing, fever, runny nose or nasal congestion within 7 days before enrollment;
4. Acute diseases or acute exacerbation of chronic disease within 3 days before vaccination;
5. A known allergy to any components of the study vaccine, or history of severe allergy (e.g. anaphylactic shock, allergic laryngeal edema, anaphylactoid purpura, thrombocytopenic purpura, Arthus reaction, severe urticaria) or serious adverse reactions to any previous vaccination or drug use;
6. Pregnant (urine pregnancy test was positive) or lactating female, or planned pregnancy within 12 months after vaccination;
7. Any confirmed or suspected immunosuppressive or immunodeficient condition due to diseases or immunosuppressive therapy, based on medical history and physical examination;
8. Serious or unstable chronic illness, including but not limit to cardiovascular diseases (such as uncontrolled hypertension, coronary heart disease, myocarditis, pericarditis), metabolic diseases (such as poorly controlled diabetes), hematological diseases (such as severe anemia, hemophilia), liver and kidney diseases, digestive diseases, respiratory diseases (such as chronic obstructive pulmonary disease, active tuberculosis, other severe respiratory diseases ), malignant tumor, major functional organ transplantation history;
9. Significant underlying illness that in the opinion of the investigator would be expected to prevent completion of the study;
10. History of thrombocytopenia or other coagulation disorders;
11. History of convulsions, epilepsy, congenital brain dysplasia, mental illness or family history, or history of brain nerve tissue damage due to other severe neurological disorders(e.g. brain tumor, cerebral hemorrhage, cerebral infarction, brain infection disease, chemical drug poisoning);
12. History of cognitive dysfunction, or any moderate or severe cognitive impairment;
13. Asplenia or functional asplenia, or autoimmune thyroid diseases, such as Hashimoto thyroiditis, toxic diffuse goiter;
14. Receipt of live vaccine within 28 days, or any other vaccine within 14 days prior to vaccination;
15. Previous vaccination with an RSV vaccine;
16. Administration of long-acting immune-modifying drugs(e.g. Infliximab) or planned administration at any time during the study period;
17. Administration of immunoglobulins and/or any blood products during the period starting 3 months before vaccination or planned administration during the study period;
18. Chronic administration of immunosuppressants or other immune-modifying drugs (such as long-term use of systemic glucocorticoid ≥14 days, ≥20mg/day prednisone or equivalent dose) during the period starting 3 months before vaccination or planned administration during the study period, but topical steroids(e.g. ointment, eye drops, inhalants, nasal sprays) that do not exceed the dosage recommended in the instructions or have any systemic signs are acceptable;
19. History of alcohol or drug abuse;
20. Concurrently participating in 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;
21. Planned move to a location that will prohibit participating in the trial until study end;
22. At screening: Any laboratory test results(hematology, clinical chemistry, coagulation function, or urinalysis) abnormal and clinically significant in the judgment of the investigator (Only for phase 1);
23. At screening: Any electrocardiogram abnormal and clinically significant in the judgment of the investigator (Only for phase 1);
24. Any condition that, in the opinion the investigator, may affect the safety of the subject or the evaluation of the study results.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

12

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Low dose vaccine group in subjects aged 18-59 years - Phase 1; Subjects aged 18-59 years in phase 1 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose); 0.25 mL per dose.
Experimental: High dose vaccine group in subjects aged 18-59 years - Phase 1; Subjects aged 18-59 years in phase 1 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose); 0.5 mL per dose
Placebo Comparator: Placebo group in subjects aged 18-59 years - Phase 1; Subjects aged 18-59 years in phase 1 will receive single dose of placebo, by IM injection into the deltoid region of the arm.	Biological: Placebo (Saline solution); 0.5 mL per dose
Experimental: Low dose vaccine group in subjects aged ≥60 years - Phase 1; Subjects aged ≥60 years in phase 1 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose); 0.25 mL per dose.
Experimental: High dose vaccine group in subjects aged ≥60 years - Phase 1; Subjects aged ≥60 years in phase 1 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose); 0.5 mL per dose
Placebo Comparator: Placebo group in subjects aged ≥60 years - Phase 1; Subjects aged ≥60 years in phase 1 will receive single dose of placebo, by IM injection into the deltoid region of the arm.	Biological: Placebo (Saline solution); 0.5 mL per dose
Experimental: Low dose vaccine group in subjects aged 50-59 years - Phase 2; Subjects aged 50-59 years in phase 2 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose); 0.25 mL per dose.
Experimental: High dose vaccine group in subjects aged 50-59 years - Phase 2; Subjects aged 50-59 years in phase 2 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose); 0.5 mL per dose
Placebo Comparator: Placebo group in subjects aged 50-59 years - Phase 2; Subjects aged 50-59 years in phase 2 will receive single dose of placebo, by IM injection into the deltoid region of the arm.	Biological: Placebo (Saline solution); 0.5 mL per dose
Experimental: Low dose vaccine group in subjects aged ≥60 years - Phase 2; Subjects aged ≥60 years in phase 2 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(low dose); 0.25 mL per dose.
Experimental: High dose vaccine group in subjects aged ≥60 years - Phase 2; Subjects aged ≥60 years in phase 2 will receive single dose of Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose), by IM injection into the deltoid region of the arm.	Biological: Recombinant Respiratory Syncytial Virus Vaccine (CHO Cells)(high dose); 0.5 mL per dose
Placebo Comparator: Placebo group in subjects aged ≥60 years - Phase 2; Subjects aged ≥60 years in phase 2 will receive single dose of placebo, by IM injection into the deltoid region of the arm.	Biological: Placebo (Saline solution); 0.5 mL per dose

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence, Intensity and Causality of adverse events(AE)	An AE includes any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product and which does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavourable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a investigational product, whether or not related to the investigational product.	Within 30 days after vaccination
Incidence, Intensity and Causality of solicited AEs	Solicited AEs include solicited local and general symptoms; Assessed solicited local AEs at injection site are pain, erythema, swelling, induration and itching; Assessed solicited general symptoms include fever, fatigue, headache, myalgia, nausea, vomiting, diarrhea, arthralgia and hypersensitivity.	Within 14 days after vaccination
Incidence, Intensity and Causality of unsolicited AEs	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/or any solicited symptom with onset outside the specified period of follow-up for solicited symptoms.	Within 30 days after vaccination
Incidence, Intensity and Causality of Severe adverse events(SAEs)	SAEs assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization, result in persistent or significant disability/incapacity or are congenital anomaly/birth defect.	Within 30 days after vaccination
Incidence, Intensity and Causality of Adverse events of special interest(AESI)	Adverse events of special interest include potential immune-mediated diseases and atrial fibrillation.	Within 30 days after vaccination
Incidence of abnormal and clinically significant laboratory test results - only for phase 1	Laboratory test includes hematology, blood biochemistry, coagulation test, urine analysis and Electrocardiograph.	The 3rd day after vaccination
Geometric Mean Titer (GMT) of Neutralizing Antibody against RSV-serotype A	Measured by Virus Neutralization Test.	30 days after vaccination
GMT of Neutralizing Antibody against RSV-serotype B	Measured by Virus Neutralization Test.	30 days after vaccination
Geometric Mean Fold Rise (GMFR) of Neutralizing Antibody against RSV-serotype A	Compared with the baseline Titer(Day 0).	30 days after vaccination
GMFR of Neutralizing Antibody against RSV-serotype B	Compared with the baseline Titer(Day 0).	30 days after vaccination
GMC of RSV-PreF specific IgG Antibody against RSV-serotype B	Measured by ELISA.	30 days after vaccination
GMFR of RSV-PreF specific IgG Antibody against RSV-serotype A	Compared with the baseline concentration(Day 0).	30 days after vaccination
GMFR of RSV-PreF specific IgG Antibody against RSV-serotype B	Compared with the baseline concentration(Day 0).	30 days after vaccination
Geometric Mean Concentration (GMC) of RSV-Prefusion F protein(RSV-PreF) specific Immunoglobulin G (IgG) Antibody against RSV-serotype A	Measured by ELISA.	30 days after vaccination

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence, Intensity and Causality of SAEs	SAEs assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization, result in persistent or significant disability/incapacity or are congenital anomaly/birth defect.	Up to 12 months post vaccination
Incidence, Intensity and Causality of AESI	Adverse events of special interest include potential immune-mediated diseases and atrial fibrillation.	Up to 12 months post vaccination
GMT of Neutralizing Antibody against RSV-serotype A and RSV-serotype B	Measured by Virus Neutralization Test.	14 days post vaccination-only for phase 1
GMFR of Neutralizing Antibody against RSV-serotype A and RSV-serotype B	Compared with the baseline Titer(Day 0).	14 days post vaccination-only for phase 1
GMC of RSV-PreF specific IgG Antibody against RSV-serotype A and RSV-serotype B	Measured by ELISA.	14 days post vaccination-only for phase 1
GMFR of RSV-PreF specific IgG Antibody against RSV-serotype A and RSV-serotype B	Compared with the baseline concentration(Day 0).	14 days post vaccination-only for phase 1
GMT of Neutralizing Antibody against RSV-serotype A and RSV-serotype B	Measured by Virus Neutralization Test.	At 6, 12, and 24 months post vaccination
GMFR of Neutralizing Antibody against RSV-serotype A and RSV-serotype B	Compared with the baseline Titer(Day 0).	At 6, 12, and 24 months post vaccination
GMC of RSV-PreF specific IgG Antibody against RSV-serotype A and RSV-serotype B	Measured by ELISA.	At 6, 12, and 24 months post vaccination
GMFR of RSV-PreF specific IgG Antibody against RSV-serotype A and RSV-serotype B	Compared with the baseline concentration(Day 0).	At 6, 12, and 24 months post vaccination
The Frequency of RSV-PreF Specific Cluster of Differentiation 4+ (CD4+) T Cells or Cluster of Differentiation 8+ (CD8+) T cells Expressing at Least 2 Markers - only for phase 2	Among markers expressed were interleukin-2 (IL-2), cluster of 40 ligand (CD40L), tumor necrosis factor alpha (TNF α) and interferon gamma (IFN γ), in vitro upon stimulation with RSV-PreF peptide preparations.	30 days post vaccination

Collaborators and Investigators

• Sponsor: MAXVAX Biotechnology Limited Liability Company
• Collaborators: Henan Center for Disease Control and Prevention
• Investigators: Principal Investigator: Lili Huang, Henan Center for Disease Control and Prevention

Study record dates

Study Major Dates

• Study Start (Actual): November 13, 2024
• Primary Completion (Estimated): June 30, 2025
• Study Completion (Estimated): February 28, 2027

Study Registration Dates

• First Submitted: October 11, 2024
• First Submitted That Met QC Criteria: October 11, 2024
• First Posted (Actual): October 15, 2024

Study Record Updates

• Last Update Posted (Actual): June 6, 2025
• Last Update Submitted That Met QC Criteria: June 4, 2025
• Last Verified: June 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Immunologic Factors; Physiological Effects of Drugs; Vaccines
• Other Study ID Numbers: MKKCT-900-001

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No