Pfizer Announces Presentation of Data from a Phase 2 Study of its 20-Valent Pneumococcal Conjugate Vaccine Candidate Being Investigated for the Prevention of Invasive Disease and Pneumonia in Adults Aged 18 Years and Older
- Category: Vaccines
- Published on Saturday, 13 April 2019 15:51
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The U.S. FDA awarded Breakthrough Therapy Designation for this potential indication based on these Phase 2 data
The Biologics License Application is expected to be submitted to the U.S. FDA by the end of 2020, subject to the successful completion of Phase 3 studies
NEW YORK, NY, USA I April 13, 2019 I Pfizer Inc. (NYSE: PFE) announced today the presentation of data from a Phase 2 study of its 20-valent pneumococcal conjugate vaccine (20vPnC) candidate, PF-06482077, being investigated for the prevention of invasive disease and pneumonia caused by Streptococcus pneumoniae serotypes contained in the vaccine in adults aged 18 years and older. The presentation was delivered at the 29th European Congress of Clinical Microbiology and Infectious Diseases (ECCMID) in Amsterdam, Netherlands. Pfizer’s 20vPnC candidate includes the 13 serotypes contained in Prevnar 13 plus seven additional serotypes (8, 10A, 11A, 12F, 15B, 22F, and 33F).
“The safety and immunogenicity results from this study suggest that our 20vPnC candidate, which initiated Phase 3 development in adults last year, could potentially offer comprehensive coverage of additional serotypes causing pneumococcal disease globally and in the U.S. as substantiated by the receipt of FDA’s Breakthrough Therapy Designation,” said Kathrin U. Jansen, Ph.D., Senior Vice President and Head of Vaccine Research & Development, Pfizer. “We believe the full extent of Prevenar 13 protection of adults has yet to be fulfilled. At the same time, there continues to be a global health need to protect against the potential effects of invasive pneumococcal disease and pneumonia caused by additional serotypes not yet covered by existing conjugate vaccines.”
The Phase 2 study was a randomized, active-controlled, double-blinded trial that enrolled 444 adult subjects age 60 to 64. Subjects received a single injection of 20vPnC or Prevnar 13 (Vaccination 1). One month later subjects receiving 20vPnC were given an injection of saline placebo, and subjects receiving Prevnar 13 were given 23-valent polysaccharide vaccine (Vaccination 2). Local reactions and systemic events were recorded for 10 and 7 days respectively after Vaccination 1 and data on adverse events (AEs) were collected for one month following each vaccination. Immunogenicity was assessed by measuring antibody associated with serotype-specific bacterial killing (opsonophagocytic activity [OPA]) prior to vaccination and one month after each vaccination. The study was designed to describe safety and immunogenicity data with 20vPnC in a population of older adults. Given the stage of the study there was no hypothesis testing and data were summarized.
Of the 444 subjects enrolled, 443 received Vaccination 1 and 427 received Vaccination 2. Robust OPA responses were observed for all 20 vaccine serotypes in the 20vPnC group. The OPA geometric mean fold-rises from baseline ranged from 6.1 to 68.6 for the serotypes in common with Prevnar 13, and 9 to 112.2 for the seven additional serotypes not included in Prevnar 13.
Injection site reactions (redness, swelling or pain) and systemic event rates were similar after vaccination with 20vPnC or Prevnar 13, with severe injection site reactions or systemic events reported in less than one percent of 20vPnC recipients. No deaths or serious AEs considered related to vaccine were reported in the study. The overall safety profile of 20vPnC in this study was consistent with historical experience with Prevnar 13.
The safety and immunogenicity findings from this Phase 2 study supported progression to Phase 3 clinical development for the adult indication which started in December 2018.
The seven new serotypes included in 20vPnC are global causes of invasive pneumococcal disease,1,2,3,4,5 and are associated with high case-fatality rates,6,7,8,9 antibiotic resistance5,10,11 and/or meningitis.12,13 Together, the 20 serotypes included in 20vPnC are responsible for the majority of currently circulating pneumococcal disease in adults in the U.S. and globally.14,15,16,17,18,19,20
About the 20vPnC Phase 3 Program
Pfizer has begun enrollment in three Phase 3 trials (NCT03828617, NCT03835975 and NCT03760146) evaluating 20vPnC in adults. Combined, these three trials will enroll more than 6,000 adult subjects, including populations of vaccine-naïve adults and adults with prior pneumococcal vaccination.
Pfizer’s Phase 3 pivotal development program for 20vPnC includes three clinical trials in populations of vaccine-naïve adults and adults with prior pneumococcal vaccination.
The pivotal Phase 3 trial is enrolling an estimated 3,880 adults and is designed to compare immune responses after 20vPnC administration to responses in control subjects ≥60 years old receiving 13-valent pneumococcal conjugate vaccine and 23-valent pneumococcal polysaccharide vaccine; evaluate the immunogenicity of 20vPnC in adults 18-59 years of age; and describe the 20vPnC safety profile in adults ≥18 years old. More on the study can be found on www.clinicaltrials.gov under the identifier NCT03760146.
Another Phase 3 trial was initiated on February 12, 2019 and is planned to enroll an estimated 875 adults. It is designed to describe the safety and immunogenicity of 20vPnC in adults 65 years of age or older with prior pneumococcal vaccination. More on the study can be found on www.clinicaltrials.gov under the identifier NCT03835975.
A third Phase 3 trial was initiated on February 14, 2019, and is planned to enroll an estimated 1,610 adults. The study is designed to provide additional safety data and evaluate three different lots of 20vPnC in adults 18 through 49 years of age. More on the study can be found on www.clinicaltrials.gov under the identifier NCT03828617.
On September 20, 2018, Pfizer announced the U.S. Food and Drug Administration (FDA) granted Breakthrough Therapy Designation for 20vPnC for the prevention of invasive disease and pneumonia in adults age 18 years and older. Breakthrough Therapy Designation is designed to expedite the development and review of drugs and vaccines that are intended to treat or prevent serious conditions and preliminary clinical evidence indicates that the drug or vaccine may demonstrate substantial improvement over available therapy on a clinically significant endpoint(s).21 Drugs and vaccines that receive Breakthrough Therapy Designation are eligible for all features of the FDA’s Fast Track designation, which may include more frequent communication with the FDA about the drug’s development plan and eligibility for Accelerated Approval and Priority Review, if relevant criteria are met.22
The FDA previously granted Fast Track designation for 20vPnC in September 2017 for use in adults aged 18 years and older.23 The FDA’s Fast Track approach is a process designed to facilitate the development and expedite the review of new drugs and vaccines intended to treat or prevent serious conditions and address an unmet medical need.22
Additionally, in May 2017 the FDA granted Fast Track status for a pediatric indication for 20vPnC and clinical development is in progress.
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21U.S. Food and Drug Administration. Breakthrough Therapy https://www.fda.gov/forpatients/approvals/fast/ucm405397.htm
22 U.S. Food and Drug Administration. Fast Track https://www.fda.gov/ForPatients/Approvals/Fast/ucm405399.htm
23 Data on file. Pfizer Inc., New York, NY