BURLINGAME, Calif.--(BUSINESS WIRE)-- Humanigen, Inc. (Nasdaq: HGEN) (“Humanigen”), a clinical-stage biopharmaceutical company focused on preventing and treating an immune hyper-response called ‘cytokine storm’, announced analysis of results from its Phase 3 LIVE-AIR study of lenzilumab in hospitalized patients with COVID-19 suggesting Black and African-American patients having a CRP<150 mg/L may be the highest responders to treatment, with a nearly 9-fold increase in likelihood of survival without ventilation (SWOV) [n=51, p-value=0.0412]. In the overall population with CRP<150 mg/L, LIVE-AIR Phase 3 results show patients treated with lenzilumab demonstrated a 2.5-fold increased likelihood of SWOV [mITT, n=351, p-value=0.0009].

“Humanigen believes this analysis is an important finding because Black and African-American patients are hyper-vulnerable to COVID-19,” said Cameron Durrant, MD, Chief Executive Officer, Humanigen. “In light of the rapid ongoing spread of the Delta variant, data suggesting that Black and African-American patients, who are hyper-vulnerable to COVID-19, and may be hyper-responsive to lenzilumab is important in the broader context of the potential benefits that may result if the FDA were to grant emergency use authorization.”

The Centers for Disease Control and Prevention (CDC) has found that race and ethnicity are risk markers for other conditions that affect health, including socioeconomic status, access to health care, and exposure to SARS-CoV-2 related to occupation, such as frontline, essential, and critical infrastructure workers.¹ The American Heart Association’s COVID-19 Cardiovascular Disease Registry found that Black patients had the highest prevalence of obesity, hypertension, and diabetes, all of which are medical conditions the CDC identifies as making adults of any age more likely to get severely ill from COVID-19.^3,4

“In the interest of public health and safety, it is our priority to share data with stakeholders to improve our understanding of the disease and potential treatments,” said Adrian Kilcoyne, MD, Chief Medical Officer, Humanigen. “While there may be some limitations to subset analyses, we believe the ongoing public health crisis caused by SARS-CoV-2 warrants consideration of these important data by regulatory authorities.”

Humanigen intends to submit data from this analysis for publication in a peer-reviewed journal and present the findings at a medical meeting. These new data from the LIVE-AIR study will also be shared with regulatory authorities in the US, UK, European Union, and other geographies.

About the LIVE-AIR, Phase 3 Study of Lenzilumab

LIVE-AIR Phase 3 study met its primary endpoint of survival without ventilation demonstrating a 1.54-fold improvement overall and trended to a 2.68-fold improvement in Black and African-American patients. This study was a randomized, double-blind, placebo-controlled, multi-center Phase 3 trial for the treatment and prevention of serious and potentially fatal outcomes in patients hospitalized with COVID-19 pneumonia. The primary objective was to assess whether lenzilumab, in addition to other treatments, which included dexamethasone (or other steroids) and/or remdesivir, could alleviate the immune-mediated ‘cytokine storm’ and improve survival without ventilation, or ‘SWOV’ (sometimes referred to as ‘ventilator-free survival’). SWOV is a composite endpoint of time to death and time to invasive mechanical ventilation (IMV), which is a robust measure that is less prone to favor a treatment with discordant effects on survival or days free of ventilation.⁵

The LIVE-AIR study enrolled 520 patients in 29 sites in the US and Brazil who were at least 18 years of age; experienced blood oxygen saturation (SpO₂) of less than or equal to 94%; or required low-flow supplemental oxygen, or high-flow oxygen support, or non-invasive positive pressure ventilation; and were hospitalized but did not require IMV. Following enrollment, subjects were randomized to receive three infusions of either lenzilumab or placebo, each infusion separated by eight hours over a 24-hour period. The primary endpoint was the difference between lenzilumab treatment and placebo treatment in SWOV through day 28 following treatment. Key secondary endpoints, also measured through day 28, included ventilator-free days, duration of ICU stay, incidence of IMV, extracorporeal membrane oxygenation (ECMO), and/or death, time to death, all-cause mortality, and time to recovery. Results of the trial have been submitted for publication in a peer-reviewed journal.