GSK, SK bioscience seek nod for SKYCovione in South Korea

SK bioscience conducted a Phase III clinical trial in 4,037 adults over 18-year-old across 6 countries (Thailand, Vietnam, New Zealand, Ukraine, the Philippines and South Korea). The vaccine candidate demonstrated superior neutralizing antibody titres over AstraZeneca's Vaxzevria (control vaccine), a currently authorized COVID-19 vaccine. SKYCovione vaccine candidate showed a clinically favorable safety profile.

The clinical trial was conducted in cooperation with 16 institutions, including Korea University Guro Hospital and IVI (International Vaccine Institute), a non-profit international organization.

The results of the Phase III clinical trial show a superior neutralizing antibody response of SKYCovione against SARS-CoV-2 parental strain, 2.93 times that of a control vaccine 2 weeks after the second dose.

In addition, the proportion of participants who seroconverted, (with a greater than four-fold increase in neutralizing antibody titres compared to baseline), was 98.06% in the SKYCovione group and 87.30% in the control group.

Both immunological superiority and non-inferiority of SKYCovione was demonstrated compared to Vaxzevria (control vaccine).

Even in subjects aged 65 or older, the antibody conversion rate of those vaccinated with SKYCovione was over 95%, when compared to the control vaccine (about 79% for the same age group).

In terms of safety, overall, SKYCovione showed a clinically acceptable safety profile​. Most of the adverse reactions that occurred after injection were mild or moderate.

Roger Connor, President of GSK Vaccines, said, "As the COVID-19 pandemic continues to evolve, a variety of vaccines will be needed to meet the health needs across the globe, including temperature stable vaccines like the SK/GSK vaccine candidate. These immunogenicity and safety data confirm the important role that our adjuvant technologies play in vaccine development."

Jae-Yong Ahn, CEO of SK bioscience said, "At this point in time, when countries around the world are developing strategies to respond to the endemic phase of the COVID-19 global health crisis, SK bioscience has reached the final stage of developing Korea's first COVID-19 vaccine for the benefit of Korea and the world. SK bioscience will not settle for the present but will do its best to become an innovative vaccine and biotechnology company in South Korea through continuous cooperation with global organizations and companies."

SKYCovione is a self-assembled nanoparticle vaccine candidate targeting the receptor binding domain of the SARS-CoV-2 Spike protein for the parental SARS-Cov-2, jointly developed with the Institute for Protein Design (IPD) at the University of Washington School of Medicine with combination of GSK's pandemic adjuvant. The development of SKYCovione has been supported by funding from the Coalition for Epidemic Preparedness Innovations (CEPI).

The approval of SKYCovione is through a formal biologics license application procedure, not a conditional approval process. In March, SK bioscience signed an advance purchase agreement with the Korea Centers for Disease Control and Prevention (KDCA) for a total of 10 million doses of SKYCovione.

In addition, SK bioscience will apply for emergency use listing (EUL) to the World Health Organization (WHO) and authorizations at individual regulatory agencies around the world. If authorized, GBP510 could be made available to the COVAX Facility for procurement and equitable allocation worldwide, if required.

SK bioscience is conducting a homologous booster clinical trial of SKYCovione in South Korea and a heterologous booster trial in both South Korea and abroad. The Adolescents trial between 12 to 17-year-old is expected to enter a Phase III stage in the first half of 2022. In addition, an extended clinical trial seeking to test the preventive effect of SKYCovione against COVID-19 variants such as Omicron is planned.