Prophylactic Vaccines
In prophylactic vaccines, we are advancing our second-generation mRNA backbone against coronavirus (SARS-CoV-2) and a range of infectious diseases, including influenza, in collaboration with GlaxoSmithKline Biologicals SA (“GSK”) pursuant to a new licensing agreement between us and GSK as announced on July 3, 2024. For further information related to the impact of the new licensing agreement refer to Note 3.1 of the Exhibit 99.1 Unaudited Interim Condensed Consolidated Financial Statements as of September 30, 2024 and for three and nine months ended September 30, 2024 and 2023.
COVID-19 Program in collaboration with GSK (second-generation mRNA backbone)
The collaboration on COVID-19 vaccine candidates with GSK, initiated in April 2021 and restructured in July 2024, aims to research, develop and manufacture mRNA vaccines targeting relevant SARS-CoV-2 variants.
On January 5, 2024, CureVac announced positive data from a formal interim analysis in the ongoing Phase 2 clinical study assessing monovalent and bivalent modified COVID-19 vaccine candidates in direct comparison to a licensed bivalent mRNA-based COVID-19 comparator vaccine. The monovalent mRNA vaccine candidate, CV0601, encodes the Omicron BA.4-5 variant; the bivalent candidate, CV0701, encodes the Omicron BA.4-5 variant as well as the original SARS-CoV-2 virus. Both vaccine candidates apply CureVac’s proprietary second-generation mRNA backbone.
Initiation of the Phase 2 study with CV0601 and CV0701 was announced on August 1, 2023. The study is being conducted in Australia and is fully enrolled with 427 healthy adult participants, as announced on November 1, 2023. It assesses the safety and immunogenicity of different single booster doses of CV0601 and CV0701. While the monovalent candidate CV0601 was tested at a single medium dose level, the bivalent candidate CV0701 was tested at low, medium, and high dose levels. All tested dose levels were below those used in mRNA-based COVID-19 vaccines licensed in the U.S. and EU.
Results from the formal interim analysis showed that both candidates exhibited a favorable reactogenicity profile across all tested doses and were generally well tolerated with a lower or similar proportion of participants reporting solicited adverse events when compared to comparator vaccine participants within seven days of dosing.
Both candidates produced meaningful immune responses beginning at the lowest tested dose. Interim immunogenicity data showed meaningful titers of neutralizing antibodies for both candidates, which matched or numerically exceeded the titers induced by the licensed comparator vaccine at all tested doses except for the low dose level of CV0701. At the medium dose level tested for CV0601, neutralizing antibody titers against the Omicron BA.4-5 variant on day 29 following the booster vaccination were 5.0 times the pre-boosting titers, numerically exceeding the 3.6-fold ratio generated by the licensed comparator vaccine. At the low, medium, and high dose levels tested for CV0701, neutralizing antibody titers against BA.4-5 on day 29 following the booster vaccination were 2.7-fold, 3.7-fold, and 4.6-fold the titers before the booster, compared to a 3.6-fold ratio for the comparator vaccine.
The Phase 2 study was based on a Phase 1 study with the modified COVID-19 mRNA construct CV0501 also applying our second-generation backbone and encoding the Omicron BA.1 variant. CV0501 was the first vaccine candidate in the COVID-19 program to apply modified mRNA. Vaccination of the first participant in the Phase 1 study with CV0501 was announced on August 18, 2022. The study was conducted at clinical sites in the United States, Australia, and the Philippines to evaluate the safety, reactogenicity, and immunogenicity of a booster vaccination of CV0501 in 180 participants. Positive preliminary data from the Phase 1 study were reported in January and April 2023 and led to the selection of modified mRNA as the preferred technology for further clinical development in the COVID-19 program. The study was completed in August 2023.
The first representative of our joint COVID-19 vaccine program with GSK based on our second-generation backbone was CV2CoV, an unmodified mRNA construct, encoding the original SARS-CoV-2 virus. A Phase 1 clinical study with CV2CoV was announced on March 30, 2022, to evaluate the safety, reactogenicity, and immunogenicity of a booster vaccination of CV2CoV in 98 participants at clinical sites in the United States. The study was completed in March 2023.
Seasonal Flu Program in collaboration with GSK (second-generation mRNA backbone)
Seasonal flu was disclosed as the first indication from the initial collaboration we started with GSK in July 2020, which we restructured in July 2024.
On April 4, 2024, we announced promising interim data from an ongoing Phase 2 part of the combined Phase 1/2 study of a seasonal influenza vaccine candidate. The multivalent candidate was designed for broad antigen coverage, encoding antigens matched to all four WHO-recommended flu strains. Results from the planned interim analysis showed that the multivalent vaccine candidate boosted antibody titers against all encoded flu strains and across all age groups and tested dose levels, including the lowest tested dose. The vaccine candidate was shown to have an acceptable safety and tolerability profile, with the majority of solicited adverse events reported as either mild or moderate. Among younger and older adults, geometric mean titers generated by the vaccine candidate against influenza A strains numerically exceeded the geometric mean titers of the licensed comparator vaccines consistently across all tested dose levels. For influenza B strains, geometric mean titers were lower than those elicited by the licensed comparator vaccines