for people ages 18 years and up (full criteria)
at Fresno, California and other locations
study started
estimated completion



The purpose of this study is to evaluate the safety and effectiveness of APL-9 in adults with mild to moderate ARDS (acute respiratory distress syndrome) caused by COVID-19 who are hospitalized and require supplemental oxygen therapy with or without mechanical ventilation. It is thought that COVID-19 activates the complement system, part of the immune system that responds to infection or tissue damage, and increases inflammation in the lungs. APL-9 has been designed to inhibit or block activation of part of the complement pathway, and potentially reduce inflammation in the lungs. Part 1 of the study is open-label to evaluate safety; all participants will receive APL-9 plus standard of care. Part 2 of the study is double-blind, randomized; participants will receive either APL-9 or the vehicle-control plus standard of care.

Official Title

A Randomized, Double-Blinded, Vehicle-Controlled, Multicenter, Parallel-Group Study of APL-9 in Mild to Moderate Acute Respiratory Distress Syndrome Due to COVID-19


COVID Covid-19 Coronavirus Coronavirus Infection Severe Acute Respiratory Syndrome Severe Acute Respiratory Syndrome Coronavirus 2 Sars-CoV2 Ards Acute Respiratory Distress Syndrome Coronavirus Infections Respiratory Distress Syndrome, Newborn Respiratory Distress Syndrome, Adult Acute Lung Injury Syndrome APL-9 Isotonic saline


You can join if…

Open to people ages 18 years and up

  • Be at least 18 years of age at time of informed consent
  • Diagnosis of active SARS CoV 2 infection using viral RNA or viral antigen within 7 days of screening
  • Respiratory failure requiring oxygen supplementation or either invasive or noninvasive mechanical ventilation with PaO2/FiO2 ratio >100 mm Hg. Respiratory failure cannot be fully explained by cardiac failure or fluid overload.

You CAN'T join if...

  • Treatment with immune checkpoint inhibitors, or other immunomodulators within 3 months prior to study enrollment (however, treatment with convalescent plasma, steroids, IL-6 inhibitors, and antiviral agents is NOT excluded)
  • Active bacterial, fungal, or parasitic infection
  • History of neuromuscular degenerative disease (eg, amyotrophic lateral sclerosis, Duchenne muscular dystrophy, or multiple sclerosis)
  • Current participation in an interventional clincial trial
  • Subjects who have, at screening, been on mechanical ventilation for >7 days Have evidence of kidney and liver failure at screening
  • Have a hereditary complement deficiency
  • Pregnancy or breastfeeding


  • University of California at San Francisco - Fresno accepting new patients
    Fresno California 93701 United States
  • California Pacific Medical Center accepting new patients
    San Francisco California 94115 United States


accepting new patients
Start Date
Completion Date
Apellis Pharmaceuticals, Inc.
Phase 1/2
Study Type
Last Updated