Corporate Overview

We are a clinical stage biopharmaceutical company, developing our immunology and immuno-oncology portfolio of monoclonal antibodies. We are focusing our efforts on the development of our lead product candidate, lenzilumab, our proprietary Humaneered® (“Humaneered”) anti-human granulocyte-macrophage colony-stimulating factor (“GM-CSF”) monoclonal antibody. Lenzilumab is a monoclonal antibody that has been proven in animal models to neutralize GM-CSF, a cytokine that we believe is of critical importance in the hyperinflammatory cascade, sometimes referred to as cytokine release syndrome (“CRS”) or cytokine storm, associated with COVID-19, chimeric antigen receptor T-cell (“CAR-T”) therapy and acute Graft versus Host Disease (“GvHD”) associated with bone marrow transplants. Lenzilumab binds to and neutralizes GM-CSF.

Humanigen has completed a phase 3 registrational trial with lenzilumab in COVID-19 pneumonia and announced positive topline data in March 2021. This study has led to a filing of an Emergency Use Authorization (“EUA”) application which, if approved, could allow us to begin limited commercialization pursuant to such EUA. Humanigen has also announced positive data in a phase 1b study to reduce CRS and neurotoxicity in patients with relapsed or refractory diffuse large B-cell lymphoma (“DLBCL”). We are also in the planning stages to conduct a phase 2/3 trial for lenzilumab to treat patients who have undergone allogeneic hematopoietic stem cell therapy (“HSCT”) who are at high risk for acute GvHD. The trial is expected to be conducted by the IMPACT Partnership, a collection of stem cell transplant centers located in the United Kingdom.

Our proprietary and patented Humaneered technology platform is a method for converting existing antibodies (typically murine) into engineered, high-affinity human antibodies designed for therapeutic use, particularly for chronic conditions. We have developed or in-licensed targets or research antibodies, typically from academic institutions, and then applied our Humaneered technology to them. Lenzilumab and our other two product candidates, ifabotuzumab and HGEN005, are Humaneered antibodies. Our Humaneered antibodies are closer to human antibodies than chimeric or conventionally humanized antibodies and have a high affinity for their target but low immunogenicity. We believe our Humaneered antibodies offer additional advantages, such as lower likelihood to induce an inappropriate immune response when used chronically, high potency, and a slow off-rate.

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