Title

Extracellular Vesicle Infusion Treatment for COVID-19 Associated ARDS
Bone Marrow Mesenchymal Stem Cell Derived Extracellular Vesicles Infusion Treatment for COVID-19 Associated Acute Respiratory Distress Syndrome (ARDS): A Phase II Clinical Trial
  • Phase

    Phase 2
  • Study Type

    Interventional
  • Intervention/Treatment

    db-001 ...
  • Study Participants

    102
To evaluate the safety and efficacy of intravenous administration of bone marrow derived extracellular vesicles, ExoFlo, versus placebo as treatment for moderate-to-severe Acute Respiratory Distress Syndrome (ARDS) in patients with severe COVID-19.
This is a Phase II, double-blinded, placebo-controlled, randomized controlled trial that enrolled 102 subjects that were admitted with COVID-19 associated moderate-to-severe ARDS across 6 sites in the United States.
Study Started
Sep 24
2020
Primary Completion
May 01
2021
Study Completion
May 22
2021
Results Posted
Apr 11
2023
Last Update
Apr 11
2023

Biological ExoFlo

Intravenous administration of bone marrow mesenchymal stem cell derived extracellular vesicles

Other Intravenous normal saline

Placebo

Placebo Placebo Comparator

Normal saline 100 mL

Experimental Dose 1 Experimental

Normal saline 90 mL and ExoFlo 10 mL

Experimental Dose 2 Experimental

Normal saline 85 mL and ExoFlo 15 mL

Criteria

Inclusion Criteria:

Provision of signed and dated informed consent form (either by the individual or by the individual's healthcare proxy).
Stated willingness to comply with all study procedures and availability for the duration of the study
Male or female, aged 18-85.
COVID-19 positive as defined by positive Reverse Transcriptase Polymerase Chain Reaction (RT-PCR) SARS-CoV-2.

Moderate to severe ARDS as defined by modified Berlin definition, * which includes timing within 1 week of known clinical insult or new or worsening respiratory symptoms; bilateral opacities not fully explained by effusions, or lung collapse; respiratory failure not fully explained by cardiac failure or fluid overload; PaO2/FiO2 ≤ 200 mm Hg.

*Modified Berlin definition used in this study is the full Berlin definition, albeit without the PEEP specification, which implies mechanical ventilation.

Hypoxia requiring noninvasive oxygen support such as Nasal Cannula (NC), Nonrebreather (NRB), Bilevel Positive Airway Pressure (BIPAP), Continuous Positive Airway Pressure (CPAP), high flow nasal cannula oxygen (HFNC O2) or mechanical ventilation (MV) despite initiating standard of care.
If the candidate is either a male or female of reproductive potential, he or she must agree to use of double barrier method of highly effective birth control contraception such as condoms with oral contraceptive pill or choose to remain abstinent if already practicing abstinence during the screening period. The required duration of usage of double barrier method OR maintenance of abstinence must include the time from the beginning of the screening period until 90 days following the last dose of the study treatment.

Exclusion Criteria:

Vulnerable populations such as pregnant patients, children, individuals with severe physical or mental disabilities who cannot provide meaningful consent.
Active malignancy requiring treatment within the last five years.
Major physical trauma in the last 5 days, including motor vehicle accidents, assaults, mechanical falls with sequelae of significant bleeding or craniofacial bruising, and surgeries.
Active tuberculosis or cystic fibrosis.
Severe chronic respiratory disease including chronic obstructive pulmonary disease or pulmonary fibrosis requiring home oxygen > 5L/min.
Use of extracorporeal membrane oxygenation (ECMO) during the current hospitalization.
Pre-existing pulmonary hypertension.
Severe pre-existing hepatic impairment (presence of cirrhosis, liver function tests (LFTs) ≥ 6x baseline, INR ≥ 2.0).
Pre-existing Chronic Kidney Disease (CKD) stage IIIb or End Stage Renal Disease (ESRD) prior to onset of COVID-19 (stage I, II, and IIIa are acceptable)
Irreversible coagulopathy (e.g., frequently occluded vascular access despite anticoagulation, precipitous platelet drops concurrent with end-organ damage suggesting consumptive process) or irreversible bleeding disorder (e.g., frequent bleeding from vascular access, endotracheal tubes, and foley).
Pneumonia clearly attributable to a non-COVID-19 related process, including aspiration pneumonia or pneumonia that is exclusively bacterial, or originating from a diagnosed alternative virus (e.g., influenza).
Patients who are not full code.
Endotracheal intubation duration ≤ 24 hours.
Moribund-expected survival < 24 hours.
Severe metabolic disturbances on presentation (e.g., ketoacidosis, pH < 7.3)

Summary

Experimental Dose 2

Experimental Dose 1

Placebo

All Events

Event Type Organ System Event Term Experimental Dose 2 Experimental Dose 1 Placebo

Evaluation of 60-day Mortality Rate

To evaluate the 60-day mortality rate for IP 15mL as a treatment for COVID-19 associated moderate to severe ARDS compared to placebo. Reducing the mortality rate for hospitalized patients with COVID-19 associated ARDS is a measure of the treatment effect.

Experimental Dose 2

Experimental Dose 1

Placebo

Overall Survival Rates

Reducing the mortality rate for hospitalized patients with COVID-19 associated ARDS is a measure of the treatment effect.

Experimental Dose 2

Overall Survival Rate at 15 Days (Kaplan-Meier Method)

78.8
Survival Percentage

Overall Survival Rate at 30 Days (Kaplan-Meier Method)

72.7
Survival Percentage

Overall Survival Rate at 60 Days (Kaplan-Meier Method)

69.6
Survival Percentage

Experimental Dose 1

Overall Survival Rate at 15 Days (Kaplan-Meier Method)

77.8
Survival Percentage

Overall Survival Rate at 30 Days (Kaplan-Meier Method)

67.7
Survival Percentage

Overall Survival Rate at 60 Days (Kaplan-Meier Method)

53.4
Survival Percentage

Placebo

Overall Survival Rate at 15 Days (Kaplan-Meier Method)

75.8
Survival Percentage

Overall Survival Rate at 30 Days (Kaplan-Meier Method)

63.7
Survival Percentage

Overall Survival Rate at 60 Days (Kaplan-Meier Method)

51.6
Survival Percentage

Proportion of Discharged Patients

Discharge is an unbiased measure of overall clinical improvement.

Experimental Dose 2

Subjects Who Discharged Within 30 Days

Subjects Who Discharged Within 60 Days

Subjects Who Discharged Within 7 Days

Experimental Dose 1

Subjects Who Discharged Within 30 Days

Subjects Who Discharged Within 60 Days

Subjects Who Discharged Within 7 Days

Placebo

Subjects Who Discharged Within 30 Days

Subjects Who Discharged Within 60 Days

Subjects Who Discharged Within 7 Days

Time to Discharge

Discharge is an unbiased measure of overall clinical improvement.

Experimental Dose 2

22.0
days (Median)
95% Confidence Interval: 6.0

Experimental Dose 1

29.0
days (Median)
95% Confidence Interval: 9.0

Placebo

Incidence of Treatment Emergent Serious Adverse Events

Safety comparison performed between IP 15 mL and placebo arms

Experimental Dose 2

Any TEAEs- Any Grade

Any TEAEs- Grade 3 or 4

Serious TEAEs- Any Grade

Serious TEAEs- Grade 3 or 4

Study Treatment-Related Serious TEAEs

Study Treatment-Related TEAEs

TEAEs That Led to Death

TEAEs That Led to Dose Interruption

TEAEs That Led to Missing Dose or Discontinued the Treatment Early

Experimental Dose 1

Any TEAEs- Any Grade

Any TEAEs- Grade 3 or 4

Serious TEAEs- Any Grade

Serious TEAEs- Grade 3 or 4

Study Treatment-Related Serious TEAEs

Study Treatment-Related TEAEs

TEAEs That Led to Death

TEAEs That Led to Dose Interruption

TEAEs That Led to Missing Dose or Discontinued the Treatment Early

Placebo

Any TEAEs- Any Grade

Any TEAEs- Grade 3 or 4

Serious TEAEs- Any Grade

Serious TEAEs- Grade 3 or 4

Study Treatment-Related Serious TEAEs

Study Treatment-Related TEAEs

TEAEs That Led to Death

TEAEs That Led to Dose Interruption

TEAEs That Led to Missing Dose or Discontinued the Treatment Early

Ventilation Free Days

Number of days for which patients are not on mechanical ventilation.

Experimental Dose 2

41.3
days (Mean)
Standard Deviation: 25.78

Experimental Dose 1

32.0
days (Mean)
Standard Deviation: 26.23

Placebo

33.9
days (Mean)
Standard Deviation: 28.06

Total

102
Participants

Age, Continuous

59.1
Years (Mean)
Standard Deviation: 13.52

BMI

34.95
kg/m^2 (Mean)
Standard Deviation: 9.615

Intubated Prior to Enrolling into the Study

7
Participants

P/F Ratio

110.634
mmHg (Mean)
Standard Deviation: 50.6610

Respiratory Rate

24.5
breaths/min (Mean)
Standard Deviation: 6.31

Time from the First COVID-19 Diagnosis to the First IP Dose Date

9.5
days (Mean)
Standard Deviation: 5.09

Total SOFA Score

3.1
scores on a scale (Mean)
Standard Deviation: 1.64

Age, Customized

P/F Ratio

Prior Therapy

Race (NIH/OMB)

Sex: Female, Male

Overall Study

Experimental Dose 2

Experimental Dose 1

Placebo

Drop/Withdrawal Reasons

Experimental Dose 2

Experimental Dose 1

Placebo