VBI Vaccines Inc. (Nasdaq: VBIV) (VBI), a commercial-stage biopharmaceutical company developing next-generation infectious disease and immuno-oncology vaccines, today announced the presentation of two abstracts featuring data from the Phase 3 program evaluating Sci-B-Vac®, the company’s 3-antigen prophylactic hepatitis B (HBV) vaccine, in e-poster presentations at ID Week 2020™, which took place October 21-25, 2020.
Poster # 8
Title: Higher hepatitis B antibody titers induced in all adults vaccinated with a 3-antigen hepatitis B (HBV) vaccine, compared to a single-antigen HBV vaccine: results from two pivotal phase 3 double-blind, randomized studies (PROTECT and CONSTANT)
Joanne Langley, M.D., Professor of Pediatrics and Community Health and Epidemiology, CIHR-GSK Chair in Pediatric Vaccinology, Dalhousie University, and Head of the Division of Infectious Disease, IWK Health Centre, and principal investigator of the PROTECT study delivered the poster presentation.
“Currently licensed HBV vaccines such as Engerix-B® have important limitations. These include reduced immunogenicity in certain subgroup populations such as adults over 45, diabetics, and persons with obesity,” said Dr. Langley. “The results from this Phase 3 clinical program clearly demonstrate Sci-B-Vac’s ability to safely induce rapid and robust immune responses in young adults, as well as in older adults and those with comorbidities – a significant improvement upon Engerix-B®.”
The poster highlighted Sci-B-Vac’s ability to elicit high serum levels of HBV surface antibodies (anti-HBs titers), persistence and durability of which are believed to be dependent upon peak levels induced.
The data included:
- High anti-HBs titers: Across both the PROTECT and CONSTANT registrational Phase 3 studies, Sci-B-Vac safely elicited higher anti-HBs titers in all study subjects compared to Engerix-B, a single antigen HBV vaccine, regardless of age, gender, or underlying comorbidity.
- PROTECT study:
- In all study subjects, adults ≥ 18 years, Sci-B-Vac induced a Geometric Mean Concentration (GMC) of anti-HBs titers that was 6x higher than that induced by Engerix-B (1,148 mIU/mL vs. 193 mIU/mL)
- The increase was sustained across key study subgroups, where Sci-B-Vac induced GMCs of anti-HBs titers that were 4-8x higher than those induced by Engerix-B, including in older adults, diabetics, and individuals with body mass index (BMI) > 30.
- CONSTANT study:
- In all study subjects, adults age 18-45, after two vaccinations, Sci-B-Vac induced GMCs of anti-HBs titers across all three manufactured lots that were more than 7.5x higher than that induced by Engerix-B (112.5-124.1 mIU/mL vs. 14.98 mIU/mL)
- These titers increased after the third vaccination, with Sci-B-Vac inducing GMCs of anti-HBs of 4,854.9-5,979.2 mIU/mL vs. 1,526.2 mIU/mL with Engerix-B
Poster # 1051
Title: Rapid onset of seroprotection rates in young adults immunized with a 3-antigen hepatitis B virus (HBV) vaccine compared to a single-antigen HBV vaccine
During the presentation, Timo Vesikari M.D., Ph.D., Professor Emeritus and Director of the Nordic Vaccine Research Network in Finland, and principal investigator of the PROTECT and CONSTANT Phase 3 clinical studies discussed the kinetics of seroprotection offered by Sci-B-Vac vs. Engerix-B in adults age 18-45, as demonstrated in five late-stage studies completed to-date: four Phase 3 studies, including PROTECT, CONSTANT, 38-13-040, SG-005-05; and one Phase 4 study, SCIB018.
“In the U.S., we are seeing elevated rates of new hepatitis B infections in younger adults, particularly those aged 30-39.” said Dr. Vesikari. “In these studies, we analyzed the seroprotection levels induced after two and three doses of vaccine, which demonstrated that Sci-B-Vac was able to more rapidly induce high rates of seroprotection than Engerix-B, with differences in speed to seroprotection notably distinct in the larger registrational studies, PROTECT and CONSTANT. This may be particularly relevant for adults age 18-45 who may require faster onset of protection against HBV.”
The e-poster data included:
- Faster onset of seroprotection in adults age 18-45 – seroprotection rate (SPR) is defined as the percent of subjects with anti-HBs titers ≥ 10 mIU/mL:
- In the four controlled Phase 3 studies, after two vaccinations, Sci-B-Vac achieved SPR rates of 87.2%-100% compared to 39.0%-89.4% for Engerix-B
- In the uncontrolled Phase 4 study, Sci-B-Vac achieved a 91.9% SPR at month 2, growing to 98.8% prior to receiving the third vaccination at month 6
Copies of both e-posters are available on the “Events/Presentations” page in the “Investors” section of VBI’s website.
About VBI Vaccines⌃
VBI Vaccines Inc. (“VBI”) is a biopharmaceutical company driven by immunology in the pursuit of powerful prevention and treatment of disease. Through its innovative approach to virus-like particles (“VLPs”), including a proprietary enveloped VLP (“eVLP”) platform technology, VBI develops vaccine candidates that mimic the natural presentation of viruses, designed to elicit the innate power of the human immune system. VBI is committed to targeting and overcoming significant infectious diseases, including hepatitis B, coronaviruses, and cytomegalovirus (CMV), as well as aggressive cancers including glioblastoma (GBM). VBI is headquartered in Cambridge, Massachusetts, with research operations in Ottawa, Canada, and a research and manufacturing site in Rehovot, Israel.
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