-- Bivalent SCB-1019 significantly boosted RSV-A and RSV-B neutralization titers to approximately 6,600 IU/mL (6.4-fold increase) and approximately 46,000 IU/mL (12-fold increase), respectively --
-- Preliminary Phase I data in target older adult population is on track for H2-2024 --
"We are encouraged by the progress and positive preliminary Phase I results for our bivalent RSV PreF vaccine candidate utilizing our validated Trimer-Tag platform, demonstrating broad and significant neutralizing antibody responses against both RSV-A and RSV-B," said
In the initial cohort enrolling young adults (aged 18-59) in the Phase I trial receiving either SCB-1019 or saline placebo, the preliminary results for geometric mean titers (GMTs) and geometric fold rises (GMFRs) for neutralizing antibodies on Day 0 (pre-vaccination) and Day 28 (post-vaccination) were as follows:
RSV A Neutralizing Antibodies | RSV B Neutralizing Antibodies | |||
SCB-1019 (n=8) | GMT (Day 0): 1,032 IU/mL GMT (Day 28): 6,648 IU/mL GMFR: 6.4-Fold Increase | GMT (Day 0): 3,950 IU/mL GMT (Day 28): 46,674 IU/mL GMFR: 11.8-Fold Increase | ||
Placebo (n=4) | GMT (Day 0): 415 IU/mL GMT (Day 28): 415 IU/mL GMFR: No Significant Change | GMT (Day 0): 3,783 IU/mL GMT (Day 28): 4,498 IU/mL GMFR: No Significant Change | ||
The RSV-A and RSV-B neutralization assays in this study were conducted at a third-party testing laboratory utilizing validated clinical assays and the NIBSC 16/284 reference standard sera, with assay values expressed as international units per milliliter (IU/mL).
Clover's preliminary immunogenicity data across both RSV-A and RSV-B neutralization appear to be in-line or potentially favorable compared to other protein subunit RSV PreF vaccines[1, 2, 3] and are supportive of Clover's bivalent RSV-A/B approach, given that other monovalent RSV-A vaccines have previously observed lower immune responses and/or efficacy against RSV-B [1, 4, 5]. The results also confirm that Clover's PreF antigens in SCB-1019 are in the stabilized prefusion and trimeric form, further supported by exploratory immunogenicity results demonstrating significant increases in Site Ø neutralizing antibody-competitive titers. Additionally, SCB-1019 vaccination did not observe any notable safety or reactogenicity issues in this initial young adult cohort, enabling the planned enrollment of older adults to proceed in the Phase I clinical trial.
The Phase I clinical trial in
[1] Icosavax Company Presentations ( [2] NIH DS-Cav1 (DOI: 10.1016/S2213-2600(21)00098-9) [3] Pfizer (NYSE:PFE) (DOI: 10.1093/infdis/jiab612) [4] GSK ACIP Presentation (21-JUN-2023) [5] Moderna (NASDAQ:MRNA) ACIP Presentation (29-FEB-2024) |
About Clover
Clover Biopharmaceuticals is a global commercial-stage biotechnology company committed to unleashing the power of innovative vaccines to save lives and improve health around the world. With integrated research and development, manufacturing and commercial capabilities as well as strong partnerships with organizations globally, Clover has a diverse pipeline of candidates that have the potential to meaningfully reduce the burden of vaccine-preventable diseases”and to make more diseases preventable.¯
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