Safety and Immunogenicity Dose-finding Study of Adjuvanted SCB-2020S Vaccine in Adults

A Phase 1, Observer-blind, Randomized, Controlled, Dose-finding Study to Evaluate the Safety and Immunogenicity of Clover Adjuvanted Recombinant SARS-CoV-2 Trimeric S-protein Subunit Vaccine (SCB-2020S) in Adults 18 to 75 Years of Age

This is a phase 1 study to assess the safety and immunogenicity of different formulations of the investigational adjuvanted recombinant SARS-CoV-2 trimeric S-protein (from beta variant) subunit vaccine (SCB-2020S vaccine), when administered as 2 dose vaccination series 21 days apart to adults ≥18 to ≤75 years of age.

Study Overview

• Status: Completed
• Conditions: COVID-19
• Intervention / Treatment: Biological: Candidate vaccine, SCB-2019; Biological: Candidate vaccine, SCB-2020S; Other: CpG/alum adjuvant; Other: Squalene based adjuvant

• Study Type: Interventional
• Enrollment (Actual): 153
• Phase: Phase 1

Contacts and Locations

Study Locations

• South Africa
  • Bloemfontein, South Africa
    • Josha Research
  • Pretoria, South Africa
    • Global Clinical Trials (Pty) Ltd
  • Soweto, South Africa
    • Wits Vaccines and Infectious Diseases Analytics (VIDA) Research Unit

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 75 years (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Male or female 18 to 75 years of age
• Individuals are willing and able to comply with study requirements, including all scheduled visits, vaccinations, laboratory tests and other study procedures
• Individuals are willing and able to give an informed consent, prior to screening
• Healthy participants or participants with pre-existing medical conditions who are in a stable medical condition.
• Female participants of childbearing potential may be enrolled in the study, if the participant has practiced highly effective method of 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 for 3 months after the last vaccination
• Male participants must agree to employ acceptable contraception from the day of the first dose of the study vaccine until 6 months after the last dose of the study vaccine and also refrain from donating sperm during this period

Exclusion Criteria:

• Individuals with body temperature >37.8°C (axillary), or any acute illness at baseline (Day 1) or within 3 days prior to randomization.
• Body mass index at screening >30 kg/m2
• Individuals with laboratory-confirmed SARS-CoV-2 infection [as defined by reverse transcriptase polymerase chain reaction (RT-PCR) assay or Rapid COVID Antigen Test or an equivalent] at the screening visit or with known history of COVID-19 within 6 months prior to Day 1
• Individuals who have received an investigational or authorized COVID-19 vaccine within 6 months prior to Day 1, or plan to receive COVID-19 vaccine during the study period
• Any confirmed or suspected immunosuppressive or immunodeficient condition resulting from disease [e.g., malignancy, human immunodeficiency virus (HIV) infection] or immunosuppressive/cytotoxic therapy (e.g., systemic corticosteroids, medications used for cancer chemotherapy, organ transplantation or to treat autoimmune disorders) within 3 months prior to Day 1.
• Individuals with any progressive unstable or uncontrolled clinical conditions
• Individuals who are pregnant, or breastfeeding, or planning to become pregnant while enrolled in this study or during the study period
• Individuals who have a history of severe adverse reaction associated with a vaccine or severe allergic reaction, e.g., anaphylaxis to any components of the study vaccines
• Individuals who have a history of malignancy within 1 year before screening (exceptions are squamous and basal cell carcinomas of the skin and carcinoma in situ of the cervix which have been cured, or other malignancies with minimal risk of recurrence).
• Individuals who have received any other investigational product within 30 days prior to Day 1 or intend to participate in another clinical study at any time during the conduct of this study
• Individuals who have received any other licensed vaccines within 14 days prior to enrollment in this study or who are planning to receive any vaccine up to 28 days after the second vaccination
• Individuals with known bleeding disorder that would, in the opinion of the investigator, contraindicate i.m. injection
• Individuals who have received treatment with rituximab or any other anti-CD20 monoclonal antibodies within 9 months prior to Day 1 or planned during the study period
• Administration of intravenous immunoglobulins and/or any blood products within 3 months prior to enrollment or planned administration during the study period
• Individuals with positive test result for hepatitis B surface antigen, hepatitis C virus antibody, or human immunodeficiency virus types 1 or 2 antibodies at Screening
• Individuals with safety laboratory test results (hematology, biochemistry, and coagulation) with a toxicity score of Grade ≥2 at Screening.
• The participant has a reported or documented history of alcohol abuse or drug addiction (excluding nonprescription health supplements and herbal remedies) within 1 year before the planned day of dose administration
• The participant has a positive test result for drugs of abuse at Screening
• Individuals with any condition that, in the opinion of the investigator, would interfere with the primary study objectives or pose additional risk to the participant

Study Plan

How is the study designed?

Design Details

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

Number of Arms

6

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Standard dose SCB-2020S with CpG/alum adjuvant; Day 1 and 22 standard dose of SCB-2020S with CpG/alum adjuvant	Biological: Candidate vaccine, SCB-2020S; a recombinant SARS-CoV-2 trimeric S-protein (from beta variant) subunit vaccine for COVID-19; Other: CpG/alum adjuvant; CpG/alum adjuvant
Experimental: Low dose SCB-2020S with low dose squalene based adjuvant; Day 1 and 22 low dose of SCB-2020S with low dose squalene based adjuvant	Biological: Candidate vaccine, SCB-2020S; a recombinant SARS-CoV-2 trimeric S-protein (from beta variant) subunit vaccine for COVID-19; Other: Squalene based adjuvant; Squalene based adjuvant
Experimental: Low dose SCB-2020S with standard dose squalene based adjuvant; Day 1 and 22 low dose of SCB-2020S with standard dose squalene based adjuvant	Biological: Candidate vaccine, SCB-2020S; a recombinant SARS-CoV-2 trimeric S-protein (from beta variant) subunit vaccine for COVID-19; Other: Squalene based adjuvant; Squalene based adjuvant
Experimental: Standard dose SCB-2020S with low dose squalene based adjuvant; Day 1 and 22 standard dose of SCB-2020S with low dose squalene based adjuvant	Biological: Candidate vaccine, SCB-2020S; a recombinant SARS-CoV-2 trimeric S-protein (from beta variant) subunit vaccine for COVID-19; Other: Squalene based adjuvant; Squalene based adjuvant
Experimental: Standard dose SCB-2020S with standard dose squalene based adjuvant; Day 1 and 22 standard dose of SCB-2020S with standard dose squalene based adjuvant	Biological: Candidate vaccine, SCB-2020S; a recombinant SARS-CoV-2 trimeric S-protein (from beta variant) subunit vaccine for COVID-19; Other: Squalene based adjuvant; Squalene based adjuvant
Active Comparator: Standard dose SCB-2019 with CpG/alum adjuvant; Day 1 and 22 standard dose of SCB-20219 with standard CpG/alum adjuvant	Biological: Candidate vaccine, SCB-2019; a recombinant SARS-CoV-2 trimeric S-protein subunit vaccine for COVID-19; Other: CpG/alum adjuvant; CpG/alum adjuvant

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of participants with local and systemic adverse events (AEs) after vaccination with SCB-2020S vaccine.	Proportion of subjects with solicited local and systemic adverse events	7 days after each dose
Number of participants with unsolicited AEs after vacccination with SCB-2020S vaccine	Proportion of subjects with unsolicited adverse events	Up to 28 days after the last vaccination
Number of participants with MAAEs, SAEs, AESIs and AEs leading to discontinuation from study.	Proportion of participants with any adverse events in this category.	Up to 1 year after the last vaccination
Number of participants with abnormal results in hematology parameters (hemoglobin, platelet count, red blood cell count, total and differential white blood cell count).	Proportion of participants with abnormal results in hematology parameters.	up to Day 29
Number of participants with abnormal results in biochemistry parameters (alanine aminotransferase, albumin, alkaline phosphatase, aspartate aminotransferase, bilirubin, blood urea nitrogen, creatinine, total protein).	Proportion of participants with abnormal results in biochemistry parameters.	up to Day 29
Number of participants with abnormal results in coagulation parameters (activated partial thromboplastin, prothrombin time).	Proportion of participants with abnormal results in coagulation parameters.	up to Day 29

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Geometric mean titer (GMT) of SARS-CoV-2 neutralising antibody (nAb)		Day 1, 22, 36, 90, 205 and 389
Proportion of participants achieving seroconversion for SARS-CoV-2 nAb		Day 22, 36, 90, 205 and 389
Geometric Mean Fold Rise (GMFRs) of SARS-CoV-2 nAb		Day 22, 36, 90, 205 and 389
Proportion of participants with nAb above a certain threshold		Day 1, 22, 36, 90, 205 and 389
GMT of SCB-2019 Binding Antibody		Day 1, 22, 36, 90, 205 and 389
Proportion of participants achieving seroconversion for SCB-2019 binding antibody	SCR is the percentage of participants with a ≥4-fold increase in titer from that at Day 1 (or from LLoQ if Day 1 titer <LLoQ).	Day 22, 36, 90, 205 and 389
GMFR of SCB-2019 binding antibody		Day 22, 36, 90, 205 and 389
SCB-2019 binding antibody above lower limit of quantification.		Day 1, 22, 36, 90, 205 and 389

Collaborators and Investigators

• Sponsor: Clover Biopharmaceuticals AUS Pty Ltd

Study record dates

Study Major Dates

• Study Start (Actual): May 30, 2022
• Primary Completion (Actual): September 23, 2022
• Study Completion (Actual): April 23, 2023

Study Registration Dates

• First Submitted: December 24, 2021
• First Submitted That Met QC Criteria: January 27, 2022
• First Posted (Actual): February 8, 2022

Study Record Updates

• Last Update Posted (Actual): July 3, 2023
• Last Update Submitted That Met QC Criteria: June 30, 2023
• Last Verified: June 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Immunologic Factors; Gastrointestinal Agents; Adjuvants, Immunologic; Antacids; Vaccines; Aluminum Hydroxide; Aluminum sulfate
• Other Study ID Numbers: CLO-SCB-2020S-002

Drug and device information, study documents

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