- Continued favorable safety and tolerability profile for all dose levels tested
- Serum samples from all dose levels tested showed robust neutralization activity against Omicron XBB.1.5, one of the dominant SARS-CoV-2 variants circulating globally
- Ongoing analysis of serum neutralizing activity and pharmacokinetic data expected to support rapid anticipated transition to pivotal clinical trial
WALTHAM, Mass., July 17, 2023 (GLOBE NEWSWIRE) -- Invivyd, Inc. (Nasdaq: IVVD), a clinical-stage biopharmaceutical company on a mission to protect the vulnerable from serious viral infectious diseases, today announced additional positive initial data from its ongoing Phase 1 healthy volunteer clinical trial of its lead investigational monoclonal antibody (mAb) candidate, VYD222. VYD222 is a broadly neutralizing, half-life extended mAb candidate in development for the prevention of symptomatic COVID-19 in vulnerable populations, such as immunocompromised people.
The Phase 1 clinical trial of VYD222 enrolled 30 healthy volunteers across three different dosing cohorts. In each cohort, participants were randomized 8:2 to VYD222 or placebo. The initial Phase 1 data showed that a single administration of VYD222 was generally well-tolerated at all three dose levels tested with no serious adverse events (SAEs) reported to date. At the middle VYD222 dose tested (2500 mg), geometric mean serum neutralizing titers were 9647.0 (95% CI: 6115.4, 15218.0) against Omicron XBB.1.5 at Day 7, with a geometric mean 92.82-fold rise (95% CI: 21.2, 406.6) from baseline to Day 7. At the highest VYD222 dose tested (4500 mg), geometric mean serum neutralizing titers were 16864.7 (95% CI: 12825.5, 22176.1) against Omicron XBB.1.5 at Day 7, with a geometric mean 120.97-fold rise (95% CI: 31.4, 466.2) from baseline to Day 7. The higher VYD222 dose levels tested in the Phase 1 clinical trial are designed to provide additional protection from potential loss of neutralization activity as SARS-CoV-2 evolves over time. The results announced today add to the positive initial Phase 1 data reported in June 2023, which showed that the lowest VYD222 dose tested (1500 mg) resulted in geometric mean serum neutralizing titers of 3245.1 (95% CI: 1882.5, 5594.0) against Omicron XBB.1.5 at Day 7, with a geometric mean 38.87-fold rise (95% CI: 10.3, 146.8) from baseline to Day 7.
Analysis of the serum neutralizing activity from samples collected at different timepoints across all dose cohorts in the Phase 1 clinical trial is ongoing, as is detailed pharmacokinetic analysis and modeling. Invivyd intends to use these analyses, combined with published clinical outcome data from prior clinical trials of vaccines and mAbs for the prevention of symptomatic COVID-19, including data from its Phase 2/3 clinical trial of adintrevimab for the prevention of COVID-19 (EVADE), to further inform its VYD222 dosing strategy.
“We are pleased to see a favorable safety and tolerability profile as well as robust serum neutralizing titers against Omicron XBB.1.5 for all the VYD222 dose levels tested in our ongoing Phase 1 clinical trial,” said Dave Hering, chief executive officer of Invivyd. “We believe these high neutralizing titer values and fold increases at this early timepoint are extremely encouraging as they indicate the potential for VYD222 to protect longer between doses and to provide additional protection from potential loss of neutralization activity as SARS-CoV-2 evolves over time.”
Mr. Hering continued, “As a point of reference, we find it encouraging to observe that even our lowest VYD222 dose tested in our Phase 1 clinical trial resulted in higher titers against Omicron XBB.1.5 than the maximum titers against XBB.1.5 from investigational XBB-containing mRNA vaccines tested in humans that were shared at the FDA’s recent vaccines advisory committee meeting. Higher VYD222 doses tested in our Phase 1 clinical trial have resulted, as expected, in higher titer levels that were well above those reported mRNA COVID-19 vaccine titer levels. We believe these initial Phase 1 clinical trial results support the potential for VYD222 to provide safe, meaningful, durable protection for vulnerable populations, such as immunocompromised people who may not generate adequate protection from COVID-19 vaccines, and we look forward to advancing VYD222 as fast as possible in collaboration with global regulators, starting with the FDA.”
About the Phase 1 Clinical Trial of VYD222
The ongoing VYD222 Phase 1 clinical trial is a randomized, blinded, placebo-controlled, dose-ranging trial that will evaluate the safety, pharmacokinetics, tolerability, and serum virus neutralizing activity of VYD222 in healthy adult volunteers (NCT05791318). The dose-ranging trial will evaluate three different doses of VYD222, each administered as a single IV push. All doses are designed to provide durability in the face of viral evolution and flexibility at the time of regulatory submission. In May 2023, Invivyd finished dosing all 30 participants in the trial; follow up is ongoing.
About VYD222
VYD222 is a broadly neutralizing, half-life extended monoclonal antibody (mAb) candidate in development for the prevention of symptomatic COVID-19 in vulnerable populations, such as immunocompromised people. Globally, there are millions of immunocompromised people, with an estimated 8-18 million in the U.S. alone, who may not adequately respond to COVID-19 vaccination, increasing their risk for severe outcomes from COVID-19. As of July 2023, there are no monoclonal antibodies authorized or approved in the U.S. for the prevention of symptomatic COVID-19.
VYD222 was designed for broad activity and has demonstrated in vitro neutralizing activity against previously circulating SARS-CoV-2 variants and current variants of concern, including Omicron sub-lineages up to and through XBB.1.5. VYD222 was engineered from adintrevimab, Invivyd’s investigational mAb that has a robust safety data package and demonstrated clinically meaningful results in global Phase 2/3 clinical trials for both the prevention and treatment of COVID-19. The company believes the adintrevimab clinical data have the potential to support accelerated development of VYD222.
About the Phase 2/3 Clinical Trial of Adintrevimab for the Prevention of COVID-19 (EVADE)
EVADE was a multi-center, double-blind, placebo-controlled, randomized Phase 2/3 clinical trial of adintrevimab for post-exposure prophylaxis (PEP) and pre-exposure prophylaxis (PrEP) of symptomatic COVID-19 in SARS-CoV-2 naïve, unvaccinated individuals (NCT04859517). Eighty-eight sites randomized 2,582 participants in 8 countries. Eligible participants were adults (≥18 years) and adolescents (12 to