Pfizer Touts Positive Data From Global Maternal Immunization Trial For Its Bivalent RSV Vaccine Candidate

Pfizer Inc (NYSE:PFE) announced topline data from the Phase 3 MATISSE trial investigating its bivalent RSV prefusion vaccine candidate administered to…
  • Pfizer Inc (NYSE:PFE) announced topline data from the Phase 3 MATISSE trial investigating its bivalent RSV prefusion vaccine candidate administered to pregnant participants to help protect their infants from RSV disease after birth.
  • The study enrolled approximately 7,400 pregnant individuals. 
  • If approved, Pfizer’s RSV vaccine candidate could be the first maternal vaccine to help prevent RSV illness in young infants.
  • The pre-planned interim efficacy analysis conducted by an external and independent Data Monitoring Committee (DMC) met the success criterion for one of two primary endpoints. 
  • Vaccine efficacy of 81.8% was observed against severe medically attended lower respiratory tract illness due to RSV in infants from birth through the first 90 days of life, with high efficacy of 69.4% demonstrated through the first six months of life.
  • Although the statistical success criterion was not met for the second primary endpoint, clinically meaningful efficacy was observed for MA-LRTI of 57.1% in infants from birth through the first 90 days of life. 
  • Efficacy for MA-LRTI of 51.3% was observed over the six-month follow-up period.
  • At the recommendation of the DMC and in consultation with the FDA, Pfizer has stopped enrollment in the study. 
  • Pfizer plans to submit a Biologics License Application (BLA) to the FDA by the end of 2022 for the vaccine candidate, followed by other regulatory authorities in the coming months.
  • In August, Pfizer reported positive data from bivalent RSV prefusion F vaccine candidate in adults 60 years or older.
  • Price Action: PFE shares are up 2.53% at $47.73 on the last check Tuesday.
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