SAB Biotherapeutics (SAB), announced that an independent Data Safety Monitoring Board (DSMB) has completed its prespecified interim analysis data review of the safety and efficacy of SAB-185 in the Phase 2 portion of the ACTIV-2 trial and has recommended advancement to Phase 3. SAB-185 is a fully human, specifically-targeted, broadly-neutralizing polyclonal antibody therapeutic candidate for the treatment of non-hospitalized patients with mild to moderate Covid-19.

It is being assessed in the ACTIV-2 trial funded and conducted by the National Institute of Allergy and Infectious Diseases (NIAID), part of the US National Institutes of Health (NIH) in collaboration with the AIDS Clinical Trials Group. SAB-185 is advancing to the Phase 3 trial based on meeting pre-defined graduation criteria.

“Advancement of SAB-185 to Phase 3 is a major milestone for our DiversitAb immunotherapy platform, which uniquely produces fully-human targeted polyclonal antibodies that have broad applicability to treating other infectious diseases and medical conditions,” said Eddie J. Sullivan, PhD, co-Founder, President, and Chief Executive Officer of SAB Biotherapeutics. “The recent publication of nonclinical data demonstrating SAB-185’s potent neutralization of multiple emerging SARS-CoV-2 variants provided additional evidence that SAB-185 has the potential to become a valuable therapy for mild to moderate Covid-19. We now look forward to the completion of the Phase 3 trial and if successful, the opportunity to make SAB-185 widely available to the many Covid-19 patients battling this persistent and evolving disease.”

Both the low and high doses of SAB-185 tested in Phase 2 met the pre-defined efficacy goal for advancement to Phase 3 and appeared safe at the interim analysis. NIAID and SAB researchers are finalizing the preferred dose to assess in Phase 3.

The Phase 3 portion of the ACTIV-2 trial is a randomized, unblinded, active comparator-controlled adaptive platform study that will assess the clinical safety and efficacy of SAB-185 compared to active control monoclonal antibody treatment in people with mild to moderate Covid-19 who are at higher risk for progression to hospitalisation, enrolling approximately 600 participants to receive the investigational agent SAB-185 and 600 to receive an active comparator. The primary outcome measures of the Phase 3 trial will include safety and non-inferiority for the prevention of a composite endpoint of either hospitalization or death from any cause through Study Day 28.