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HUMANIGEN ANNOUNCES THERMO FISHER PARTNERSHIP TO EXPAND MANUFACTURING FOR COVID-19 THERAPEUTIC CANDIDATE LENZILUMAB™

• Collaboration further strengthens manufacturing capabilities and capacity in advance of potential Emergency Use Authorization in 2020

HUMANIGEN ANNOUNCES PRICING OF PUBLIC OFFERING OF COMMON STOCK AND COMMENCEMENT OF TRADING ON NASDAQ UNDER THE SYMBOL “HGEN”

HUMANIGEN AND LONZA ANNOUNCE COLLABORATION TO EXPAND MANUFACTURING OF HUMANIGEN'S COVID-19 THERAPEUTIC CANDIDATE LENZILUMAB

• Collaboration to expand lenzilumab manufacturing capacity in advance of potential Emergency Use Authorization in 2020

• Commercial manufacturing to begin in 2021 at Lonza's manufacturing facility at Hayward

• The collaboration is projected to take lenzilumab through product launch and commercial supply

HUMANIGEN ANNOUNCES REVIEW OF LENZILUMAB PHASE 3 STUDY IN COVID-19 BY DATA SAFETY MONITORING BOARD

• Independent data safety monitoring board (DSMB) unanimously recommends trial continuation without modification after conducting pre-specified interim analysis for safety, futility, sample size and power

• Enrollment target of 300 patients expected to be completed this month

HUMANIGEN TO HOST INVESTOR KOL CONFERENCE CALL

• Conference call and webcast scheduled for Thursday, September 3 at 11:00 a.m. EDT

Webinar slide deck available for download (PDF, 2.8 MB).

LENZILUMAB COVID-19 CASE-CONTROL STUDY PUBLISHED IN MAYO CLINIC PROCEEDINGS JOURNAL

• 80% reduction in relative risk of invasive mechanical ventilation and/or death in patients treated with lenzilumab compared to the control group

• Median time to resolution of acute respiratory distress syndrome (ARDS) reduced to one day for patients treated with lenzilumab versus eight days in control group

• Lenzilumab patients discharged from the hospital in less than half the time compared with control group

HUMANIGEN EXPANDS PHASE III STUDY OF LENZILUMAB IN COVID-19 TO BRAZIL

• Study approval by Brazil’s ministry of health follows IND approval granted by the FDA in the US

• Brazil represents an important component of Humanigen’s global development program for lenzilumab

HUMANIGEN TO HOST INVESTOR CONFERENCE CALL TO DISCUSS NIH’S SELECTION OF LENZILUMAB FOR BIG EFFECT TRIAL

Conference call and webcast hosted August 3, 2020 at 4:30 pm EDT

Webinar slide deck available for download (PDF, 0.6 MB).

TIMOTHY MORRIS JOINS HUMANIGEN AS CHIEF OPERATING OFFICER AND CHIEF FINANCIAL OFFICER

NATIONAL INSTITUTES OF HEALTH SELECTS HUMANIGEN’S LENZILUMAB FOR ITS COVID-19 BIG EFFECT TRIAL

• Big Effect Trial (BET) sponsored by the National Institute of Allergy and Infectious Diseases (NIAID) to advance high priority therapeutic candidates for COVID-19

• Lenzilumab will be evaluated in combination with remdesivir and compared to placebo and remdesivir

HUMANIGEN REPORTS ADDITIONAL ANALYSIS OF LENZILUMAB IN SEVERE AND CRITICAL COVID-19 PATIENTS

• Lenzilumab median time to recovery of five days compares favorably to remdesivir’s 10 days in a similar patient group

• Lenzilumab Phase 3 potential registration study ongoing in severe and critical COVID-19 patients

• Humanigen hosted a webinar on June 16th, 2020 to discuss results of the initial cohort of patients treated with lenzilumab

Webinar slide deck available for download (PDF, 1.1 MB).

MAYO CLINIC STUDY OF HUMANIGEN’S LENZILUMAB SHOWS RAPID RECOVERY AND DISCHARGE IN SEVERE AND CRITICAL COVID-19 PATIENTS

• Median time to recovery and discharge of five days

• All patients were at high risk of progression, including four patients who were in the ICU prior to receiving lenzilumab

• No treatment emergent adverse events were attributable to lenzilumab

HUMANIGEN ANNOUNCES $71,800,000 EQUITY FINANCING

• J.P. Morgan Securities LLC acting as placement agent

• Financing syndicate includes Venrock Healthcare Capital Partners, Surveyor Capital (a Citadel company), HealthCor, Valiant Capital Partners, First Light Asset Management and Ghost Tree Capital

FIRST PATIENT DOSED IN FDA-APPROVED PHASE III LENZILUMAB STUDY FOR COVID-19

First Phase III pivotal study for an anti-GM-CSF therapy in COVID-19 patients

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• First US randomized, double-blind, placebo-controlled, multi-center, Phase III study with an anti-GM-CSF monoclonal antibody which, if successful, may lead to lenzilumab product approval for COVID-19

• Targeting prevention of serious outcomes in adult, hospitalized patients with COVID-19 pneumonia

HUMANIGEN PARTNERS WITH CTI, A LEADING CONTRACT RESEARCH ORGANIZATION, FOR PLANNED PHASE III STUDY FOR LENZILUMAB FOR CORONAVIRUS TREATMENT

FIRST PATIENT INFUSED IN JOINT HUMANIGEN/KITE, A GILEAD COMPANY CLINICAL STUDY

• ZUMA-19 study being conducted as part of a clinical collaboration in the U.S.

• Study evaluating the potential effects of lenzilumab (anti-human-GM-CSF monoclonal antibody) prior to Yescarta® (axicabtagene ciloleucel) in adults with relapsed or refractory large B-cell lymphoma

KITE AND HUMANIGEN ANNOUNCE CLINICAL COLLABORATION TO EVALUATE INVESTIGATIONAL COMBINATION OF YESCARTA® (AXICABTAGENE CILOLEUCEL) WITH LENZILUMAB IN RELAPSED/REFRACTORY DIFFUSE LARGE B-CELL LYMPHOMA

• GM-CSF has been identified, through clinical correlative analysis and preclinical modeling, as a potential key signal in the inflammatory cascade triggering toxicities associated with chimeric antigen receptor T (CAR T) cell therapy

• Emerging pre-clinical evidence suggests that lenzilumab inhibition of GM-CSF may have the potential to disrupt CAR T cell mediated inflammation without disrupting CAR T cell anti-tumor efficacy

• Phase 1/2 Multi-Center Clinical Trial to Begin Enrolling in Q4 2019

“This collaboration with Kite will help validate the work Humanigen has done in understanding the pathophysiology of the inflammatory cascade as well as the potential role GM-CSF plays in influencing CAR T cell treatment outcomes.”

View 8-K at SEC.gov

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