Global regulatory submissions made for MRNA-1345 a respiratory syncytial virus vaccine from Moderna Inc.

The Company has submitted marketing authorization applications for mRNA-1345 with the European Medicines Agency (EMA), Swissmedic in Switzerland, and the Therapeutic Goods Administration (TGA) in Australia and has initiated the rolling submission process for a Biologics License Application (BLA) to the FDA for the licensure of the mRNA-based RSV vaccine.

The regulatory applications are based on positive data from a prespecified interim analysis of the pivotal ConquerRSV study, a randomized, double-blind, placebo-controlled study of approximately 37,000 adults 60 years or older in 22 countries. The primary efficacy endpoints were based on two definitions of RSV-LRTD, defined as either two or more symptoms or three or more symptoms of disease. The trial met both its primary efficacy endpoints, with a vaccine efficacy (VE) of 83.7% (95.88% CI: 66.1%, 92.2%; p<0.0001) against rsv-lrtd as defined by two or more symptoms, and a ve of 82.4% (96.36% ci: 34.8%, 95.3%; p="0.0078)" against rsv-lrtd defined by three or more symptoms.

The vaccine was well tolerated with a favorable safety profile. Most solicited adverse reactions were mild or moderate, and the most commonly reported solicited adverse reactions in the mRNA-1345 group were injection site pain, fatigue, headache, myalgia, and arthralgia. The ConquerRSV study is ongoing, and additional efficacy analyses are planned as cases accrue, including for severe RSV. In addition to older adults, mRNA-1345 is being investigated in a fully enrolled, ongoing Phase 1 trial in pediatric populations.