Medigen Vaccine Biologics Corp’s (高端疫苗) phase 3 clinical trials for an enterovirus 71 (EV71) vaccine completed the multi-regional, multi-central data “unblinding” yesterday, with the results, including safety, immunogenicity and efficacy, meeting its expectations.
The company would compile a final analysis report as soon as possible, and apply for the new drug certificate from domestic and foreign drug authorities in the third quarter, Medigen said in a Taiwan Stock Exchange filing yesterday.
Its phase 3 trials were conducted in Taiwan and Vietnam with 3,049 participants ranging from two months old to six years old, Medigen said.
Photo: Sam Yeh, AFP
The company enrolled its first participant for the phase 3 trials in April 2019 and completed the enrollment of all participants in December that year, it said.
Participants were recruited in a randomized, double-blinded and placebo-controlled study, it added.
Participants were divided into three age groups: two months to six months old, six months to two years old, and two years to six years old, Medigen said.
The number of infants from two months to six months old accounted for 25 percent of all participants, it said.
The results showed the drug’s safety and tolerance were good, even for young participants, and there was no significant difference in safety and tolerance between participants who were given the vaccine and those who received a placebo, the company said.
As for immunogenicity, results showed that the seroprotection rates 28 days, six months and one year after two EV71 vaccination doses were higher than health authorities’ requirements, it said. The seroprotection rates refer to the degree of antibody prevalence.
In terms of efficacy, Medigen said that the experimental drug offered statistically significant protection against the enterovirus under the Poisson regression model.
As enterovirus infections are popular in Taiwan, China and Southeast Asia, the company hopes its vaccine can hit the market soon, as there are no EV71 vaccine products available in other parts of the world, except for China.
At present, only three Chinese manufacturers have launched enterovirus vaccines to be marketed locally in China, Medigen said.
Those vaccines are suitable for children over the age of six months, it said.
In 2018, the market sales of China’s EV71 vaccines reached more than NT$30 billion (US$1.08 billion), and about 21 million doses were sold per year on average in the past three years, Medigen said.
The company on June 10 reported positive results from an interim analysis of phase 2 trials for its COVID-19 vaccine. It has applied to the Food and Drug Administration for emergency use authorization and is preparing to conduct phase 3 trials abroad.
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