Trial NCT04495933
Publication Chappell K, Lancet, 2021
Dates: 2020-06-23 to 2020-08-17
Funding: Public/non profit (Coalition for Epidemic Preparedness Innovations; National Health and Medical Research Council, Queensland Government, and philanthropic sources.)
Conflict of interest: Yes
Methods | |
RCT | |
Location :
Single center / Australia Follow-up duration (months): 1.84 | |
•Placebo, 2 doses (n=24) •5-mcg SARS-CoV-2 Sclamp, 2 doses (n=24) •15-mcg SARS-CoV-2 Sclamp, 2 doses (n=24) •45-mcg SARS-CoV-2 Sclamp, 2 doses (n=24) •45-mcg SARS-CoV-2 Sclamp, 1 dose followed by placebo (n=24) |
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Inclusion criteria |
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Exclusion criteria |
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Interventions | |
Intervention
2 IM doses of 5-mcg SARS-CoV-2 Sclamp 28 days apart. 2 IM doses of 15-mcg SARS-CoV-2 Sclamp 28 days apart. 2 IM doses of 45-mcg SARS-CoV-2 Sclamp 28 days apart. 1 IM dose 45-mcg SARS-CoV-2 Sclamp Day 0, 1 IM dose saline Day 28 |
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Control
2 IM doses of saline 28 days apart. | |
Participants | |
Randomized 120 participants | |
Characteristics of participants Type of participants: Healthy volunteers N=120 65 males Children: 0 Pregnant women: 0 Immunocompromized patients: 0 Mean age: 32.5 Age range: 18-55 | |
Description of participants Healthy SARS-CoV-2 infection-free adults aged 18-55 at one center in Australia. | |
Primary outcome | |
In the register Frequency of Solicited local reactogenicity adverse events (AEs) [ Time Frame: 7 days following each vaccination (at Days 1 and 29) ]; Frequency of Solicited systemic reactogenicity adverse events (AEs) [ Time Frame: 7 days following each vaccination (at Days 1 and 29) ]; Grading of Solicited local reactogenicity adverse events (AEs) [ Time Frame: 7 days following each vaccination (at Days 1 and 29) ]; Grading of Solicited systemic reactogenicity adverse events (AEs) [ Time Frame: 7 days following each vaccination (at Days 1 and 29) ]; Unsolicited adverse events (AEs) [ Time Frame: 28 days following each vaccination (at Days 1 and 29) ]; Serious adverse events (SAEs), Medically attended adverse events (MAAEs) and any Adverse events (AEs) leading to study withdrawal at any time during the study [ Time Frame: through study completion (394 days) ]; Geometric Mean Titer (GMT) of the serum antibody response [ Time Frame: 28 days following each vaccination (Days 29 and 57) ]; Geometric Mean Titer (GMT) of the serum neutralizing antibody (NAb) response to SARS-CoV-2 virus [ Time Frame: 28 days following each vaccination (Days 29 and 57) ] | |
In the report The primary safety endpoints included the frequency, duration, and intensity of solicited local and systemic adverse events (AEs) for 7 days after each dose, the frequency, duration, intensity, and relatedness of unsolicited AEs through Day 57, and the frequency of serious AEs and AEs leading to study discontinuation throughout the study. The primary immunogenicity endpoints included the geometric mean of the serum antibody response to SARS-CoV-2 Sclamp compared with placebo by antigen-specific enzyme-linked immunosorbent assay (ELISA) at Day 29 and Day 57, and the geometric mean of the serum neutralising antibody titres to SARS-CoV-2 virus compared with placebo at Day 29 and Day 57. | |
Documents available |
Protocol NR Statistical plan * Data-sharing stated:
Yes, Immediately after publication with no end date. |
Risk of bias Overall The overall risk of bias reported in the table corresponds to the highest risk of bias for the outcomes assessed for the systematic review |
Some concerns |
General comment | In addition to the published article, the retrospective trial registry and supplementary appendices were used in data extraction and assessment of risk of bias. Neither protocol nor statistical analysis plan was available. The 45mcg followed by placebo arm was not included in the trial registry. Other than that there were no substantive difference between the registry and the pre-print article in population, procedures, interventions or outcomes. This is an early interim analysis of a Phase 1 study in which follow up is ongoing. The study achieved its pre-stated sample size. This trial was updated on May 20th, 2021 after publication of study report. |