A Study to Evaluate the Immunogenicity and Safety of a Recombinant Protein COVID-19 Vaccine in Population Aged ≥18 Years

A Randomized, Double-blind, Positive-controlled Phase II Clinical Trial to Evaluate the Immunogenicity and Safety of SCTV01E (A COVID-19 Alpha/Beta/Delta/Omicron Variants S-Trimer Vaccine) in Population Aged ≥18 Years and Previously Fully Vaccinated With mRNA COVID-19

The study is a randomized, double-blind, positive-controlled Phase II booster study. It will evaluate the immunogenicity and safety of SCTV01E compared with Comirnaty.

Study Overview

• Status: Not yet recruiting
• Conditions: COVID-19; SARS-CoV-2 Infection
• Intervention / Treatment: Biological: SCTV01E; Biological: Comirnaty

Detailed Description

Approximately 400 participants aged ≥18 years old and previously vaccinated with 2 or 3 doses of Comirnaty will be enrolled in this study. They will be randomly assigned to SCTV01E Group and Comirnaty Group in a ratio of 1:1.

• Study Type: Interventional
• Enrollment (Anticipated): 400
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Dilihumare ·Niyazi; Phone Number: +86 10 58628288-9014; Email: dilihumare_niyazi@sinocelltech.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

Participants are eligible to be included in the study only if the following conditions are met:

1. Male or female aged ≥18 years old when signing ICF;
2. Participants who were fully vaccinated with 2 or 3 doses of mRNA COVID-19 vaccine (Comirnaty). The interval between the last dose and this study vaccination is 4 to 12 months;
3. The participant and/or his entrusted person can sign written ICF, and can fully understand the trial procedure, the risk of participating in the trial, and other interventions that can be selected if they do not participate in the trial;
4. The participant and/or his entrusted person has the ability to read, understand, and fill in record cards;
5. Healthy participants or participants with pre-existing medical conditions who are in stable condition. The "pre-existing medical conditions" include but not limited to hypertension, diabetes, chronic cholecystitis and cholelithiasis, chronic gastritis that meet the described criteria. A stable medical condition is defined as disease not requiring significant change in therapy or no need for hospitalization as a consequence of worsening disease state for at least 3 months prior to enrollment;
6. Fertile men and women of childbearing potential voluntarily agree to take effective contraceptive measures from signing ICF to 6 months after the study vaccination; the pregnancy test results of women of childbearing potential are negative on screening.

Exclusion Criteria:

A participant who conforms to any of the following criteria should be excluded from the study:

1. Presence of fever within 3 days before the study vaccination;
2. A positive result of nucleic acid test for SARS-CoV-2 during the screening period or previously diagnosed with COVID-19;
3. A history of infection or disease related to severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS), or other disease with corresponding use of immunosuppressants;
4. A history of allergic reactions to any vaccine or drug, such as allergy, urticaria, severe skin eczema, dyspnea, laryngeal edema, and angioneurotic edema;
5. A medical or family history of seizure, epilepsy, encephalopathy and psychosis;
6. Immunocompromised patients suffering from immunodeficiency diseases, important organ diseases, immune diseases (including Guillain-Barre Syndrome [GBS], systemic lupus erythematosus, rheumatoid arthritis, asplenia or splenectomy caused by any circumstances, and other immune diseases that may have an impact on immune response in the investigator's opinion), etc.;
7. Long-term use of immunosuppressant therapy or immunomodulatory drugs for ≥14 days within the first six months prior to enrollment. Whereas short-term (≤14 days) use of oral, inhaled and topical steroids are allowed;
8. Patients on antituberculosis therapy;
9. Presence of severe or uncontrollable cardiovascular diseases, or severe or uncontrollable disorders related to endocrine system, blood and lymphatic system, liver and kidney, respiratory system, metabolic and skeletal systems, or malignancies (skin basal cell carcinoma and carcinoma in-situ of cervix are exceptions and will not be excluded), such as severe heart failure, severe pulmonary heart disease, unstable angina, liver failure, or uremia;
10. Contraindications for intramuscular injection or intravenous blood sampling, including thrombocytopenia and other blood coagulation disorders;
11. Participants who received any immunoglobulin or blood products in the previous 3 months before enrollment, or plan to receive similar products during the study;
12. Participants who received other investigational drugs within 1 month before the study vaccination;
13. Participants who is at the acute stage of illness, such as acute onset of chronic heart failure, acute sore throat, hypertensive encephalopathy, acute pneumonia, acute renal insufficiency, acute cholecystitis;
14. Participants received other drugs or vaccines used to prevent COVID-19, but participants previously received Comirnaty will not be excluded;
15. Participants vaccinated with influenza vaccine within 14 days or with other vaccines within 28 days before the study vaccination;
16. Those who donated blood or had blood loss (≥450 mL) within 3 months before the vaccination or plan to donate blood during the study period;
17. Those who are pregnant or breast-feeding or plan to be pregnant during the study period;
18. Those who plan to donate ovum or sperms during the study period;
19. Those who cannot follow the trial procedures, or cannot cooperate to complete the study due to planned relocation or long-term outing;
20. Those unsuitable for participating in the clinical trial as determined by the investigator because of other abnormalities that are likely to confuse the study results, or non-conformance with the maximal benefits of the participants;
21. Those who are tested positive for HIV in terms of serology.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: SCTV01E Group; Participants will receive one dose of SCTV01E on Day 0	Biological: SCTV01E; intramuscular injection
Active Comparator: Comirnaty Group; Participants will receive one dose of Comirnaty on Day 0	Biological: Comirnaty; intramuscular injection

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Geometric mean titers (GMT) of neutralizing antibodies (nAb) to Omicron variant on Day 28	day 28 sfter the study vaccination
GMT of nAb to variant Delta on Day 28	day 28 sfter the study vaccination

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
GMT of nAb to Alpha variant on Day 28		day 28 sfter the study vaccination
GMT of nAb to Beta variant on Day 28		day 28 sfter the study vaccination
Number of IFN-γ positive (characterizing Th1) and IL-4 positive (characterizing Th2) T cell subsets on Day 28.		day 28 sfter the study vaccination
Seroresponse rates of nAb to Omicron variant on D28	Seroresponse is defined as a change from below the low limit of quantitation [LLOQ] to equal to or above LLOQ, or a ≥4-fold rise if baseline is equal to or above LLOQ in nAb from baseline	day 28 after the study vaccination
Seroresponse rates of nAb to Delta variant on D28	Seroresponse is defined as a change from below the low limit of quantitation [LLOQ] to equal to or above LLOQ, or a ≥4-fold rise if baseline is equal to or above LLOQ in nAb from baseline	day 28 after the study vaccination
Seroresponse rates of nAb to Alpha variant on D28	Seroresponse is defined as a change from below the low limit of quantitation [LLOQ] to equal to or above LLOQ, or a ≥4-fold rise if baseline is equal to or above LLOQ in nAb from baseline	day 28 after the study vaccination
Seroresponse rates of nAb to Beta variant on D28	Seroresponse is defined as a change from below the low limit of quantitation [LLOQ] to equal to or above LLOQ, or a ≥4-fold rise if baseline is equal to or above LLOQ in nAb from baseline	day 28 after the study vaccination
Incidence and severity of solicited AEs from Day 0 to Day 7 after the study vaccination		day 0 to day 7 after the study vaccination
Incidence and severity of unsolicited AEs from Day 0 to Day 28 after the study vaccination		day 0 to day 28 after the study vaccination
Incidence and severity of SAEs and AESIs within 180 days after study vaccination		day 0 to day 180 after the study vaccination

Collaborators and Investigators

• Sponsor: Sinocelltech Ltd.

Study record dates

Study Major Dates

• Study Start (Anticipated): July 1, 2022
• Primary Completion (Anticipated): September 1, 2022
• Study Completion (Anticipated): March 1, 2023

Study Registration Dates

• First Submitted: April 11, 2022
• First Submitted That Met QC Criteria: April 11, 2022
• First Posted (Actual): April 14, 2022

Study Record Updates

• Last Update Posted (Actual): April 14, 2022
• Last Update Submitted That Met QC Criteria: April 11, 2022
• Last Verified: April 1, 2022

More Information

Terms related to this study

• Keywords: SARS-CoV-2; vaccine; COVID-19
• Additional Relevant MeSH Terms: Coronavirus Infections; Coronaviridae Infections; Nidovirales Infections; RNA Virus Infections; Virus Diseases; Infections; Respiratory Tract Infections; Respiratory Tract Diseases; Pneumonia, Viral; Pneumonia; Lung Diseases; COVID-19
• Other Study ID Numbers: SCTV01E-01-mRNA-BRA-1

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No