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Evaluation of the Safety and Efficacy of Razuprotafib in Hospitalized Subjects With Coronavirus Disease 2019

Phase 2, Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Dose Escalation and Proof-of-Concept Study to Evaluate the Safety and Efficacy of Razuprotafib in Hospitalized Subjects With Coronavirus Disease 2019

Status
Terminated
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04511650
Acronym
RESCUE
Enrollment
31
Registered
2020-08-13
Start date
2020-10-21
Completion date
2021-02-26
Last updated
2023-06-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Acute Respiratory Distress Syndrome (ARDS), COVID-19

Keywords

COVID-19, ARDS, Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)

Brief summary

This was a Phase 2, randomized, double-blind, placebo-controlled, parallel-group, multicenter, dose escalation and proof-of-concept study to evaluate the safety and efficacy of razuprotafib, administered 3 times daily (TID) (every 8 hours \[Q8H\]), in hospitalized subjects with moderate to severe Coronavirus disease 2019 (COVID-19) receiving standard of care therapy. The study was planned to include 2 parts with Part 1 comprising the dose escalation period of the study and Part 2 comprising the proof-of-concept safety and efficacy period of the study.

Detailed description

Part 1 was to be a 2-step dose escalation that included approximately 60 subjects. Part 1, Step 1 was to include 30 subjects, and Part 1, Step 2 was to include 30 subjects. Part 1 was designed to primarily focus on safety; however, efficacy data was to be collected and analyzed as well. Despite the Data Review Committee (DRC) recommendation to continue the study, after completion of Part 1, Step 1, the Sponsor elected to discontinue the study due to business-related reasons. Recruitment challenges and slow site startup led to delays in completing the study in a practical timeframe, and were the primary reasons to discontinue the study. No further subjects were recruited after Part 1, Step 1 completion. A full analysis of the data from Part 1, Step 1 was conducted and is presented in this report. Part 1, Step 2 and Part 2 was not conducted.

Interventions

DRUGRazuprotafib Subcutaneous Solution

Up to 3 daily dose levels of Razuprotafib Subcutaneous Solution will be evaluated. Doses will be administered subcutaneously three times daily (Q8H) for 7 days.

DRUGPlacebo Subcutaneous Solution

Matched vehicle-controlled placebo solution will be administered subcutaneously three times daily (Q8H) for 7 days

Sponsors

EyePoint Pharmaceuticals, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
SEQUENTIAL
Primary purpose
TREATMENT
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)

Intervention model description

The study was planned to include 2 parts with Part 1 comprising the dose escalation period of the study and Part 2 comprising the proof-of-concept safety and efficacy period of the study. Although The Data Review Committee (DRC) recommended to continue with the study after the completion of Part 1, Step 1, the Sponsor elected to discontinue the study due to business-related reasons.

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

1. Ability to understand and provide informed consent; 2. Males and non-pregnant females 18 years of age or older at the time of Screening; 3. Laboratory-confirmed active SARS-CoV-2 infection within 72 hours prior to randomization, or (if testing results cannot be obtained) by evidence of progressive disease suggestive of ongoing SARS-CoV-2 infection; 4. Females of childbearing potential must be willing to completely abstain or agree to use a highly effective method of contraception through Day 28; and have a negative urine pregnancy test during Screening; 5. Currently hospitalized, receiving standard of care therapy for COVID-19, and meets the criteria for moderate or severe COVID-19, as follows: Moderate = symptoms of moderate illness with COVID-19, which could include any symptom of mild illness or shortness of breath with exertion and with respiratory rate at 20 or greater breaths/min, Peripheral capillary oxygen saturation (SpO2) \>93% on room air at sea level, or heart rate at 90 or greater beats/min; Severe = symptoms suggestive of severe systemic illness with COVID-19, which could include any symptom of moderate illness, shortness of breath at rest, or respiratory distress, and respiratory rate at 30 or greater breaths/min, heart rate at 125 or greater beats/min, or SpO2 \>93% on room air at sea level or (partial pressure of oxygen:fraction of inspired oxygen (PaO2:FiO2) \<300.

Exclusion criteria

1. Inability to initiate study drug within 12 hours after randomization; 2. Female of childbearing potential who is unable or unwilling to forego breastfeeding through Day 28; 3. Systolic blood pressure \<100 mmHg; 4. In shock or requiring pressor support; 5. Respiratory failure, defined as subjects who are on mechanical ventilation; are receiving oxygen delivered by high-flow nasal cannula (heated, humidified, oxygen delivered via reinforced nasal cannula at flow rates \>20 L/min with fraction of delivered oxygen of 0.5 or greater), noninvasive positive pressure ventilation, or extracorporeal membrane oxygenation (ECMO); or have a clinical diagnosis of respiratory failure (ie, clinical need for 1 of the preceding therapies, but preceding therapies not able to be administered in setting of resource limitation); 6. Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \>3 × the upper limit of normal (ULN); 7. Total bilirubin \>2 × ULN; 8. Estimated glomerular filtration rate \<30 mL/min or receiving hemodialysis or hemofiltration; 9. Moribund subject not expected to survive 24 hours in the opinion of the treating clinical team; 10. Any concurrent serious medical condition (eg, active malignancies on chemotherapy, post organ transplant, end stage congestive heart failure) or not likely to respond to treatment; 11. Decision to withhold life-sustaining treatment; Note: In the event of cardiac arrest, the decision to withhold cardiopulmonary resuscitation only does not fulfill this exclusion criterion. 12. Use of cytochrome P450 (CYP) 2 subfamily C, polypeptide 8 (2C8) substrates (eg, repaglinide, paclitaxel, or cerivastatin) or CYP3A4 substrates (eg, amlodipine, budesonide, dasabuvir, enzalutamide, imatinib, lopinavir, loperamide, saquinavir, sildenafil, midazolam, or montelukast); 13. Use of CYP2C8 inhibitors (eg, gemfibrozil, fluvoxamine, or ketoconazole); 14. Participation in another investigational study during the present study through the last visit (Day 28); or 15. Previous randomization in this study.

Design outcomes

Primary

MeasureTime frameDescription
Number and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Baseline up to Day 7 and Day 28All results were summarized descriptively by treatment arm and expressed as proportions, along with corresponding 95%CI of the difference between response rates, and p-values using Cochran-Mantel-Haenszel (CMH). The 95% CI will be constructed using the normal approximation method. Respiratory failure was defined as subjects who were on invasive mechanical ventilation; received oxygen delivered by high-flow nasal cannula (heated, humidified, oxygen delivered via reinforced nasal cannula at flow rates \>20L/min with fraction of delivered oxygen ≥0.5) noninvasive positive pressure ventilation or extracorporeal membrane oxygenation; or had a clinical diagnosis of respiratory failure (ie, clinical need for 1 of the preceding therapies, but preceding therapies not able to be administered in setting of resource limitation).Subjects who died prior to the study timepoint (Day 7 or Day 28) were imputed based on the worst outcome.

Secondary

MeasureTime frameDescription
Summary of The Mean Change From Baseline in D-Dimer at Day 7 and 28at Day 7 and 28Mean Change from baseline in systemic biomarkers of vascular leakage and inflammation (ie, D-Dimer) at Day 7 and 28 in the Full Analysis Set
Summary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28at Day 7 and 28Change from baseline in systemic biomarkers of vascular leakage and inflammation (ie, CRP ) at Day 7 and 28 in the Full Analysis Set
Number of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28from baseline to Day 7 and baseline to Day 28Analysis of the proportion of participants who improve by \>=2 categories on the NIAID 8-point scale from baseline to Day 7. % = 100 x n/N', where N' = number of participants with a non-missing values at baseline and the specified post-baseline visit. Baseline is defined as the last measurement prior to the first dose of study drug.
Number of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Day 7 and Day 28The number of participants who were discharged and free of respiratory failure at Day 7 and Day 28 were summarized by treatment arm and pooled razuprotafib (10 and 20 mg) group.
Number of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any TimeBaseline up to Day 28Analysis of Number of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time Through Day 28 in the Full Analysis Set
Time to Reach Grade 6, 7, or 8 on the NIAID 8-Point Ordinal ScaleFrom Screening through the end of the study (up to 28 days)The clinical status of the participants was assessed within 1 hr prior to each dose of study drug, using the NIAID 8-point ordinal scale until Day 28. After the treatment period, clinical status will be assessed once daily until Day 18, unless discharged. If the subject is discharged alive prior to Day 28, clinical status was assessed at the post-treatment observation period telephone visits only. Grade 6=hospitalized, not requiring oxygen and no longer requires ongoing medical care; Grade 7 = not hospitalized, limitation on activities and/or requiring home oxygen; and Grade 8 = not hospitalized, no limitations on activities.
Change in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Baseline up to Day 7 and Day 28Analysis of the change in PaO2:FiO2 ratio from baseline to Day 7 (or discharge) and baseline to Day 28 (or discharge) in the intent-to-treat population. Baseline was defined as the last measurement prior to the first dose of study drug. Baseline PaO2;FiO2 ratio value was not provided for the pooled Razuprotafib group.
Length of Hospitalization From Baseline to Day 7 and Day 28 (or Death)From Baseline to Day 7 or Day 28 (or Death)Analysis of length of hospitalization from baseline to day 7 and day 28 (or death) in the intent-to-treat population. Baseline was defined as the last measurement prior to the first dose of study drug. Baseline values were not provided. The length of hospitalization was to include all days that the participant was admitted to the hospital. For participants who were discharged and readmitted to the hospital, the length of hospitalization was to include the days after readmission. Hospitalization days were counted in 24-hour periods; any partial days were counted as a whole day.
Number of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28From baseline to Day 7 and Day 28Analysis of number of participants who worsen by \>= 2 categories on the NIAID 8-point ordinal scale from baseline to Day 7 in the Full Analysis Population. % = 100 x n/N', where N' = number of participants with non-missing values at baseline and the specified post-baseline visit. Participants who died prior to the Day 7 or Day 28 were imputed as 1.
Number of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline, Day 7, and Day 28Summary of number and percent of subjects in each category (ie, categories 1 to 8) of the NIAID 8-Point Ordinal Scale at baseline, Day 7 and Day 28. The NIAID 8-point ordinal scale includes the following grades: 1. Death; 2. Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 3. Hospitalized, on noninvasive ventilation or high-flow oxygen devices; 4. Hospitalized, requiring supplemental oxygen; 5. Hospitalized, not requiring supplementation oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 6. Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 7. Not hospitalized, limitation on activities and/or requiring home oxygen; and 8. Not hospitalized, no limitations on activities.
The Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28Baseline up to Day 7 and Day 28Analysis of the Number and Percent of Participants who Experienced All-Cause Mortality at Day 7 and Day 28 in the Full Analysis Set
Number of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Baseline to Day 7 and Day 28Analysis of number of participants who improve by \>= 2 categories on the NIAID 8-point scale from baseline to Day 7 and Day 28 in the full analysis set.% = 100 x n/N', where N' = number of participants with non-missing values at baseline and the specified post-baseline visit. Participants who died prior to the Day 7 or Day 28 were imputed as 1.
Time to Return to Prehospitalization Oxygen Requirementup to 28 daysSummary of Time to Return to Prehospitalization Oxygen Requirement in the Intent-to-Treat Population
Length of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Baseline up to Day 7 and Day 28Analysis of length of hospitalization and not requiring invasive mechanical ventilation from baseline to Day 7 and Day 28 in the intent-to-treat population. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. The summaries of the mean number of days from baseline included only those participants with available data. Baseline was defined as the last measurement prior to the first dose of study drug. Baseline values were not provided.The length of hospitalization was to include all days that the participant was admitted to the hospital. For participants who were discharged and readmitted to the hospital, the length of hospitalization was to include the days after readmission. Hospitalization days were counted in 24-hour periods; any partial days were counted as a whole day.

Other

MeasureTime frameDescription
Summary of Razuprotafib Plasma Concentrationrazuprotafib plasma concentrations 30 and 90 minutes post-dose on Days 1 and 6A summary of plasma razuprotafib concentrations for samples collected on Day 1 and 6 in the pharmacokinetic population. All results were summarized descriptively by treatment group.

Countries

United States

Participant flow

Recruitment details

A total of 31 subjects (11 in the placebo, 10 in the 10 mg Razuprotafib, and 10 in the 20 mg razuprotafib groups) were enrolled from a period October 21, 2020 to February 26, 2021. A total of 29 subjects (10 in the placebo, 9 in the 10 mg Razuprotafib, and 10 in the razuprotafib groups) were treated with study treatment. Two subjects (1 in each of placebo and 10 mg razuprotafib groups) were randomized and not treated. Therefore, a total of 29 subjects are included in the safety population.

Participants by arm

ArmCount
Razuprotafib 10mg
Razuprotafib Subcutaneous Solution: Up to 3 daily dose levels of Razuprotafib Subcutaneous Solution will be evaluated. Doses will be administered subcutaneously three times daily (Q8H) for 7 days.
10
Razuprotafib 20mg
Razuprotafib Subcutaneous Solution: Up to 3 daily dose levels of Razuprotafib Subcutaneous Solution will be evaluated. Doses will be administered subcutaneously three times daily (Q8H) for 7 days.
10
Placebo
Placebo Subcutaneous Solution: Matched vehicle-controlled placebo solution will be administered subcutaneously three times daily (Q8H) for 7 days
11
Total31

Withdrawals & dropouts

PeriodReasonFG000FG001FG002
Overall StudyDeath111
Overall StudyLost to Follow-up100
Overall Studyreason not provided001
Overall StudyWithdrawal by Subject100

Baseline characteristics

CharacteristicRazuprotafib 20mgTotalRazuprotafib 10mgPlacebo
Age, Customized
Age at Informed Consent
53.4 years
STANDARD_DEVIATION 16.55
58.3 years
STANDARD_DEVIATION 14.85
58.3 years
STANDARD_DEVIATION 11.52
62.7 years
STANDARD_DEVIATION 15.81
Comorbid conditions, n (%)
Chronic Kidney Disease
0 Participants2 Participants1 Participants1 Participants
Comorbid conditions, n (%)
Diabetes
4 Participants13 Participants3 Participants6 Participants
Comorbid conditions, n (%)
Heart Failure
0 Participants1 Participants1 Participants0 Participants
Comorbid conditions, n (%)
Hypertension
6 Participants19 Participants8 Participants5 Participants
Comorbid conditions, n (%)
Obesity
4 Participants10 Participants4 Participants2 Participants
Concomitant medications to treat COVID-19 at baseline, n (%)
None
0 Participants2 Participants1 Participants1 Participants
Concomitant medications to treat COVID-19 at baseline, n (%)
Other
8 Participants18 Participants6 Participants4 Participants
Concomitant medications to treat COVID-19 at baseline, n (%)
Remdesivir
6 Participants17 Participants3 Participants8 Participants
Concomitant medications to treat COVID-19 at baseline, n (%)
Systemic steroids
10 Participants28 Participants8 Participants10 Participants
Coronavirus disease (COVID-19) severity, n (%)
Moderate
2 Participants8 Participants3 Participants3 Participants
Coronavirus disease (COVID-19) severity, n (%)
Severe
8 Participants23 Participants7 Participants8 Participants
Ethnicity (NIH/OMB)
Hispanic or Latino
3 Participants7 Participants4 Participants0 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
7 Participants23 Participants5 Participants11 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants1 Participants1 Participants0 Participants
National Institutes of Allergy and Infectious Diseases
Category 1 = Death
0 Participants0 Participants0 Participants0 Participants
National Institutes of Allergy and Infectious Diseases
Category 2 = Hospitalized on mechanical ventilation
0 Participants0 Participants0 Participants0 Participants
National Institutes of Allergy and Infectious Diseases
Category 3 = Hospitalized, on noninvasive ventilation or high-flow oxygen devices
5 Participants13 Participants4 Participants4 Participants
National Institutes of Allergy and Infectious Diseases
Category 4= Hospitalized, requiring supplemental oxygen
5 Participants16 Participants5 Participants6 Participants
National Institutes of Allergy and Infectious Diseases
Category 5= Hospitalized, not requiring supplemental oxygen - requiring ongoing COVID-19 care
0 Participants2 Participants1 Participants1 Participants
National Institutes of Allergy and Infectious Diseases
Category 6= Hospitalized, not requiring supplemental oxygen - no longer requires medical care
0 Participants0 Participants0 Participants0 Participants
National Institutes of Allergy and Infectious Diseases
Category 7=Not hospitalized, limitation on activities or requiring home oxygen
0 Participants0 Participants0 Participants0 Participants
National Institutes of Allergy and Infectious Diseases
Category 8= Not hospitalized, no limitations on activities
0 Participants0 Participants0 Participants0 Participants
Pre-hospitalization oxygen requirement, n (%)
CPAP mask (for non-respiratory failure reasons)
0 Participants1 Participants1 Participants0 Participants
Pre-hospitalization oxygen requirement, n (%)
Low-flow nasal cannula
0 Participants3 Participants2 Participants1 Participants
Pre-hospitalization oxygen requirement, n (%)
None
10 Participants27 Participants7 Participants10 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
Asian
1 Participants2 Participants1 Participants0 Participants
Race (NIH/OMB)
Black or African American
0 Participants6 Participants3 Participants3 Participants
Race (NIH/OMB)
More than one race
0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
1 Participants1 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
1 Participants3 Participants2 Participants0 Participants
Race (NIH/OMB)
White
7 Participants19 Participants4 Participants8 Participants
Screening Peripheral Oxygen Saturation (Pa02)/Fraction of Inspired Oxygen (FiO2) ratio146.15 ratio
STANDARD_DEVIATION 80.602
186.71 ratio
STANDARD_DEVIATION 118.212
194.97 ratio
STANDARD_DEVIATION 131.546
212.40 ratio
STANDARD_DEVIATION 132.21
Sex: Female, Male
Female
2 Participants8 Participants1 Participants5 Participants
Sex: Female, Male
Male
8 Participants23 Participants9 Participants6 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
deaths
Total, all-cause mortality
1 / 101 / 91 / 10
other
Total, other adverse events
6 / 107 / 98 / 10
serious
Total, serious adverse events
2 / 102 / 95 / 10

Outcome results

Primary

Number and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28

All results were summarized descriptively by treatment arm and expressed as proportions, along with corresponding 95%CI of the difference between response rates, and p-values using Cochran-Mantel-Haenszel (CMH). The 95% CI will be constructed using the normal approximation method. Respiratory failure was defined as subjects who were on invasive mechanical ventilation; received oxygen delivered by high-flow nasal cannula (heated, humidified, oxygen delivered via reinforced nasal cannula at flow rates \>20L/min with fraction of delivered oxygen ≥0.5) noninvasive positive pressure ventilation or extracorporeal membrane oxygenation; or had a clinical diagnosis of respiratory failure (ie, clinical need for 1 of the preceding therapies, but preceding therapies not able to be administered in setting of resource limitation).Subjects who died prior to the study timepoint (Day 7 or Day 28) were imputed based on the worst outcome.

Time frame: Baseline up to Day 7 and Day 28

Population: The Full Analysis (FA) Population included subjects who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. The FA Population was a subset of the ITT Population which was defined as all subjects randomized. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. Count of participants who were alive and free of respiratory failure on Days 7 and 28 were included in analyses.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 289 Participants
PlaceboNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 78 Participants
Razuprotafib 10 mgNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 75 Participants
Razuprotafib 10 mgNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 286 Participants
Razuprotafib 20 mgNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 76 Participants
Razuprotafib 20 mgNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 287 Participants
Pooled RazuprotafibNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 2813 Participants
Pooled RazuprotafibNumber and Percent of Subjects Who Were Alive and Free of Respiratory Failure Prior to Day 7 and Day 28Number and Percent of Subjects who were Alive and Free of Respiratory Failure Prior to Day 711 Participants
Secondary

Change in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28

Analysis of the change in PaO2:FiO2 ratio from baseline to Day 7 (or discharge) and baseline to Day 28 (or discharge) in the intent-to-treat population. Baseline was defined as the last measurement prior to the first dose of study drug. Baseline PaO2;FiO2 ratio value was not provided for the pooled Razuprotafib group.

Time frame: Baseline up to Day 7 and Day 28

Population: Intent-to-Treat (ITT) Population: The ITT Population was defined as all subjects randomized. Participants in this population were analyzed according to the treatment group to which they were assigned at randomization. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. The summaries of the mean changes from baseline included only those participants with available data.

ArmMeasureGroupValue (MEAN)Dispersion
PlaceboChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 28140.95 ratioStandard Deviation 76.887
PlaceboChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 727.44 ratioStandard Deviation 55.259
PlaceboChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Baseline212.40 ratioStandard Deviation 132.21
Razuprotafib 10 mgChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 2896.21 ratioStandard Deviation 155.077
Razuprotafib 10 mgChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Baseline194.97 ratioStandard Deviation 131.546
Razuprotafib 10 mgChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 718.81 ratioStandard Deviation 82.833
Razuprotafib 20 mgChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Baseline146.15 ratioStandard Deviation 80.602
Razuprotafib 20 mgChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 748.34 ratioStandard Deviation 81.008
Razuprotafib 20 mgChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 28117.01 ratioStandard Deviation 87.03
Pooled RazuprotafibChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 28110.08 ratioStandard Deviation 97.312
Pooled RazuprotafibChange in PaO2:FiO2 Ratio From Baseline to Day 7 and Baseline to Day 28Day 734.92 ratioStandard Deviation 79.142
Secondary

Length of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)

Analysis of length of hospitalization and not requiring invasive mechanical ventilation from baseline to Day 7 and Day 28 in the intent-to-treat population. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. The summaries of the mean number of days from baseline included only those participants with available data. Baseline was defined as the last measurement prior to the first dose of study drug. Baseline values were not provided.The length of hospitalization was to include all days that the participant was admitted to the hospital. For participants who were discharged and readmitted to the hospital, the length of hospitalization was to include the days after readmission. Hospitalization days were counted in 24-hour periods; any partial days were counted as a whole day.

Time frame: Baseline up to Day 7 and Day 28

Population: Intent-to-Treat (ITT) Population: The ITT Population was defined as all subjects randomized. Participants in this population were analyzed according to the treatment group to which they were assigned at randomization. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. Those participants who had post-baseline values on Day 7 and 28 were included in the analyses.

ArmMeasureGroupValue (MEAN)Dispersion
PlaceboLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 75.0 DaysStandard Deviation 1.7
PlaceboLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 287.2 DaysStandard Deviation 4.69
Razuprotafib 10 mgLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 289.9 DaysStandard Deviation 6.64
Razuprotafib 10 mgLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 75.8 DaysStandard Deviation 2.17
Razuprotafib 20 mgLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 76.2 DaysStandard Deviation 1.14
Razuprotafib 20 mgLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 2812.7 DaysStandard Deviation 8.31
Pooled RazuprotafibLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 76.0 DaysStandard Deviation 1.67
Pooled RazuprotafibLength of Hospitalization and Not Requiring Invasive Mechanical Ventilation From Baseline to Day 7 and Day 28 (or Death)Day 2811.4 DaysStandard Deviation 7.54
Secondary

Length of Hospitalization From Baseline to Day 7 and Day 28 (or Death)

Analysis of length of hospitalization from baseline to day 7 and day 28 (or death) in the intent-to-treat population. Baseline was defined as the last measurement prior to the first dose of study drug. Baseline values were not provided. The length of hospitalization was to include all days that the participant was admitted to the hospital. For participants who were discharged and readmitted to the hospital, the length of hospitalization was to include the days after readmission. Hospitalization days were counted in 24-hour periods; any partial days were counted as a whole day.

Time frame: From Baseline to Day 7 or Day 28 (or Death)

Population: Intent-to-Treat (ITT) Population: The ITT Population was defined as all subjects randomized. Participants in this population were analyzed according to the treatment group to which they were assigned at randomization. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. Participants who had post-baseline data on Days 7 and 28 (or death) were included in the analyses.

ArmMeasureGroupValue (MEAN)Dispersion
PlaceboLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 75.0 DaysStandard Deviation 1.7
PlaceboLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 287.2 DaysStandard Deviation 4.69
Razuprotafib 10 mgLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 2814.1 DaysStandard Deviation 9.69
Razuprotafib 10 mgLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 75.8 DaysStandard Deviation 2.17
Razuprotafib 20 mgLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 76.2 DaysStandard Deviation 1.14
Razuprotafib 20 mgLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 2814.6 DaysStandard Deviation 9.47
Pooled RazuprotafibLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 76.0 DaysStandard Deviation 1.67
Pooled RazuprotafibLength of Hospitalization From Baseline to Day 7 and Day 28 (or Death)Day 2814.4 DaysStandard Deviation 9.28
Secondary

Number of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time

Analysis of Number of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time Through Day 28 in the Full Analysis Set

Time frame: Baseline up to Day 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included participants who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. The count of participants who had post-baseline data and were alive and not requiring mechanical ventilation were included in the analysis.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time9 Participants
Razuprotafib 10 mgNumber of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time6 Participants
Razuprotafib 20 mgNumber of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time8 Participants
Pooled RazuprotafibNumber of Participants Alive and Not Requiring Invasive Mechanical Ventilation at Any Time14 Participants
Comparison: Pooled Razuprotafib comparison to Placebo. All results are summarized descriptively by treatment arm and expressed as proportions, along with corresponding 95% confidence intervals (CIs) of the difference between response rates, and p-values.p-value: 0.4795Cochran-Mantel-Haenszel
Secondary

Number of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28

Summary of number and percent of subjects in each category (ie, categories 1 to 8) of the NIAID 8-Point Ordinal Scale at baseline, Day 7 and Day 28. The NIAID 8-point ordinal scale includes the following grades: 1. Death; 2. Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 3. Hospitalized, on noninvasive ventilation or high-flow oxygen devices; 4. Hospitalized, requiring supplemental oxygen; 5. Hospitalized, not requiring supplementation oxygen - requiring ongoing medical care (COVID-19 related or otherwise); 6. Hospitalized, not requiring supplemental oxygen - no longer requires ongoing medical care; 7. Not hospitalized, limitation on activities and/or requiring home oxygen; and 8. Not hospitalized, no limitations on activities.

Time frame: Baseline, Day 7, and Day 28

Population: Intent-to-Treat (ITT) Population: The ITT Population was defined as all subjects randomized. Subjects in this population were analyzed according to the treatment group to which they were randomized. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. Those participants who had Baseline and post-baseline data on Days 7 and 28 were included in the analyses.

ArmMeasureGroupCategoryValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 732 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline10 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2850 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2830 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2884 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline20 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 741 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2860 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 781 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline34 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 750 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 720 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 710 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline46 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2820 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline50 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2810 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 774 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline60 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline80 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2875 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2840 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline70 Participants
PlaceboNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 760 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline70 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline80 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2873 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 750 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 710 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 720 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 741 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 734 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2883 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2850 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2810 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline44 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline51 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2840 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline10 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 781 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline20 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline34 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2860 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 771 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2830 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2821 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline60 Participants
Razuprotafib 10 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 760 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2831 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2840 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2850 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2860 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2875 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2882 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline70 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline10 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline20 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline36 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline44 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline50 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline60 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline80 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 710 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 720 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 734 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 742 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 750 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 760 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 771 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 781 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2810 Participants
Razuprotafib 20 mgNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2821 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 750 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline70 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline60 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2840 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 760 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline51 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline310 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2822 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 772 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline20 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline10 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2850 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 782 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline48 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2885 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2831 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2810 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 738 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 720 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2878 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 743 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 710 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Baseline80 Participants
Pooled RazuprotafibNumber of Participants in Each Category of the NIAID 8-point Ordinal Scale at Day 7 and Day 28Day 2860 Participants
Secondary

Number of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28

Analysis of the proportion of participants who improve by \>=2 categories on the NIAID 8-point scale from baseline to Day 7. % = 100 x n/N', where N' = number of participants with a non-missing values at baseline and the specified post-baseline visit. Baseline is defined as the last measurement prior to the first dose of study drug.

Time frame: from baseline to Day 7 and baseline to Day 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included participants who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. The count of participants who had NIAID 8-point scale results at the Day 7 and Day 28 timepoints were included in the analyses.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Participants who improved by >=2 categories from Baseline to Day 75 Participants
PlaceboNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Subjects who improved by >=2 categories from Baseline to Day 289 Participants
Razuprotafib 10 mgNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Subjects who improved by >=2 categories from Baseline to Day 286 Participants
Razuprotafib 10 mgNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Participants who improved by >=2 categories from Baseline to Day 72 Participants
Razuprotafib 20 mgNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Participants who improved by >=2 categories from Baseline to Day 72 Participants
Razuprotafib 20 mgNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Subjects who improved by >=2 categories from Baseline to Day 287 Participants
Pooled RazuprotafibNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Participants who improved by >=2 categories from Baseline to Day 74 Participants
Pooled RazuprotafibNumber of Participants Who Improve by at Least 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Baseline to Day 28Subjects who improved by >=2 categories from Baseline to Day 2813 Participants
Secondary

Number of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28

Analysis of number of participants who improve by \>= 2 categories on the NIAID 8-point scale from baseline to Day 7 and Day 28 in the full analysis set.% = 100 x n/N', where N' = number of participants with non-missing values at baseline and the specified post-baseline visit. Participants who died prior to the Day 7 or Day 28 were imputed as 1.

Time frame: Baseline to Day 7 and Day 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included participants who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. Those participants who had post-baseline data on Day 7 and 28 were included in analyses.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 75 Participants
PlaceboNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 289 Participants
Razuprotafib 10 mgNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 286 Participants
Razuprotafib 10 mgNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 72 Participants
Razuprotafib 20 mgNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 72 Participants
Razuprotafib 20 mgNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 287 Participants
Pooled RazuprotafibNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 74 Participants
Pooled RazuprotafibNumber of Participants Who Improve by Greater or Equal to 2 Categories on the NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who improve by >=2 categories on Day 2813 Participants
Secondary

Number of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28

The number of participants who were discharged and free of respiratory failure at Day 7 and Day 28 were summarized by treatment arm and pooled razuprotafib (10 and 20 mg) group.

Time frame: Day 7 and Day 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included participants who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. The count of participants who were discharged and free of respiratory failure at the Day 7 and Day 28 timepoints.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 77 Participants
PlaceboNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 289 Participants
Razuprotafib 10 mgNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 286 Participants
Razuprotafib 10 mgNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 73 Participants
Razuprotafib 20 mgNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 74 Participants
Razuprotafib 20 mgNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 287 Participants
Pooled RazuprotafibNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 77 Participants
Pooled RazuprotafibNumber of Participants Who Were Discharged and Free of Respiratory Failure Prior to Day 7 and Day 28Prior to Day 2813 Participants
Secondary

Number of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28

Analysis of number of participants who worsen by \>= 2 categories on the NIAID 8-point ordinal scale from baseline to Day 7 in the Full Analysis Population. % = 100 x n/N', where N' = number of participants with non-missing values at baseline and the specified post-baseline visit. Participants who died prior to the Day 7 or Day 28 were imputed as 1.

Time frame: From baseline to Day 7 and Day 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included participants who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. Those participants who had post-baseline data on Days 7 and 28 were included in the analyses.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
PlaceboNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 281 Participants
PlaceboNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 70 Participants
Razuprotafib 10 mgNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 281 Participants
Razuprotafib 10 mgNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 70 Participants
Razuprotafib 20 mgNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 281 Participants
Razuprotafib 20 mgNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 70 Participants
Pooled RazuprotafibNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 70 Participants
Pooled RazuprotafibNumber of Participants Who Worsen by Greater Than or Equal to 2 Categories on The NIAID 8-point Ordinal Scale From Baseline to Day 7 and Day 28Participants who worsened by >= 2 categories from baseline to Day 282 Participants
Secondary

Summary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28

Change from baseline in systemic biomarkers of vascular leakage and inflammation (ie, CRP ) at Day 7 and 28 in the Full Analysis Set

Time frame: at Day 7 and 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included subjects who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. The summaries of the mean change from baseline analyses included those participants who had post-baseline CRP values available on Days 7 and 28.

ArmMeasureGroupValue (MEAN)Dispersion
PlaceboSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Mean Change from Baseline at Day 7-13.17 mg/dLStandard Deviation 21.8
PlaceboSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Baseline17.44 mg/dLStandard Deviation 27.17
Razuprotafib 10 mgSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Mean Change from Baseline at Day 7-29.55 mg/dLStandard Deviation 60.99
Razuprotafib 10 mgSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Baseline25.67 mg/dLStandard Deviation 50.64
Razuprotafib 20 mgSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Baseline23.01 mg/dLStandard Deviation 45.95
Razuprotafib 20 mgSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Mean change from baseline at Day 28-4.26 mg/dLStandard Deviation 3.87
Razuprotafib 20 mgSummary of Change From Baseline in C-Reactive Protein (CRP) at Day 7 and 28Mean Change from Baseline at Day 7-22.64 mg/dLStandard Deviation 47.95
Secondary

Summary of The Mean Change From Baseline in D-Dimer at Day 7 and 28

Mean Change from baseline in systemic biomarkers of vascular leakage and inflammation (ie, D-Dimer) at Day 7 and 28 in the Full Analysis Set

Time frame: at Day 7 and 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included subjects who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. The summaries of the mean change from baseline analyses included those participants who had post-baseline D-Dimer values available on Days 7 and 28.

ArmMeasureGroupValue (MEAN)Dispersion
PlaceboSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Mean Change from Baseline at Day 7-144.5 ng/mLStandard Deviation 133.63
PlaceboSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Baseline466.9 ng/mLStandard Deviation 243.85
Razuprotafib 10 mgSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Baseline1750.9 ng/mLStandard Deviation 2137.46
Razuprotafib 10 mgSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Mean Change from Baseline at Day 78913.4 ng/mLStandard Deviation 16869.43
Razuprotafib 20 mgSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Baseline823.2 ng/mLStandard Deviation 787.39
Razuprotafib 20 mgSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Mean Change from Baseline at Day 72239.0 ng/mLStandard Deviation 5485.79
Razuprotafib 20 mgSummary of The Mean Change From Baseline in D-Dimer at Day 7 and 28Mean change from baseline at Day 282121.0 ng/mLStandard Deviation 1566.95
Secondary

The Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28

Analysis of the Number and Percent of Participants who Experienced All-Cause Mortality at Day 7 and Day 28 in the Full Analysis Set

Time frame: Baseline up to Day 7 and Day 28

Population: Full Analysis (FA) Population: The FA Population was a subset of the ITT Population and included subjects who received at least 1 dose of study drug and had at least 1 post-dose efficacy evaluation. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the FA Population. The participants who had post-baseline data on Days 7 and 28 were included in the all-cause mortality analyses.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
PlaceboThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 70 Participants
PlaceboThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 281 Participants
Razuprotafib 10 mgThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 70 Participants
Razuprotafib 10 mgThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 281 Participants
Razuprotafib 20 mgThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 281 Participants
Razuprotafib 20 mgThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 70 Participants
Pooled RazuprotafibThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 282 Participants
Pooled RazuprotafibThe Number and Percent of Participants Who Experienced All-Cause Mortality at Day 7 and Day 28All-Cause Mortality at Day 70 Participants
Secondary

Time to Reach Grade 6, 7, or 8 on the NIAID 8-Point Ordinal Scale

The clinical status of the participants was assessed within 1 hr prior to each dose of study drug, using the NIAID 8-point ordinal scale until Day 28. After the treatment period, clinical status will be assessed once daily until Day 18, unless discharged. If the subject is discharged alive prior to Day 28, clinical status was assessed at the post-treatment observation period telephone visits only. Grade 6=hospitalized, not requiring oxygen and no longer requires ongoing medical care; Grade 7 = not hospitalized, limitation on activities and/or requiring home oxygen; and Grade 8 = not hospitalized, no limitations on activities.

Time frame: From Screening through the end of the study (up to 28 days)

Population: Intent-to-Treat (ITT) Population: The ITT Population was defined as all subjects randomized. Participants in this population were analyzed according to the treatment group to which they were assigned at randomization. Note: The overall number of participants analyzed represents the total number of participants in each treatment group for the ITT Population. The number of participants included in the analyses had post-baseline data through the end of the study.

ArmMeasureValue (MEAN)Dispersion
PlaceboTime to Reach Grade 6, 7, or 8 on the NIAID 8-Point Ordinal Scale9.8 daysStandard Deviation 5.87
Razuprotafib 10 mgTime to Reach Grade 6, 7, or 8 on the NIAID 8-Point Ordinal Scale11.7 daysStandard Deviation 7.87
Razuprotafib 20 mgTime to Reach Grade 6, 7, or 8 on the NIAID 8-Point Ordinal Scale11.7 daysStandard Deviation 5.47
Pooled RazuprotafibTime to Reach Grade 6, 7, or 8 on the NIAID 8-Point Ordinal Scale11.7 daysStandard Deviation 6.51
Secondary

Time to Return to Prehospitalization Oxygen Requirement

Summary of Time to Return to Prehospitalization Oxygen Requirement in the Intent-to-Treat Population

Time frame: up to 28 days

Population: Intent-to-Treat (ITT) Population: The ITT Population was defined as all participants randomized. Participants in this population were analyzed according to the treatment group to which they were assigned at randomization.

ArmMeasureValue (MEAN)Dispersion
PlaceboTime to Return to Prehospitalization Oxygen Requirement5.1 DaysStandard Deviation 5.05
Razuprotafib 10 mgTime to Return to Prehospitalization Oxygen Requirement6.4 DaysStandard Deviation 7.83
Razuprotafib 20 mgTime to Return to Prehospitalization Oxygen Requirement9.7 DaysStandard Deviation 9.87
Pooled RazuprotafibTime to Return to Prehospitalization Oxygen Requirement7.4 DaysStandard Deviation 8.06
Other Pre-specified

Summary of Razuprotafib Plasma Concentration

A summary of plasma razuprotafib concentrations for samples collected on Day 1 and 6 in the pharmacokinetic population. All results were summarized descriptively by treatment group.

Time frame: razuprotafib plasma concentrations 30 and 90 minutes post-dose on Days 1 and 6

Population: Pharmacokinetic (PK) Population: The PK Population was defined as all randomized subjects who received at least 1 dose of study drug and had least 1 PK sample with plasma concentration.

ArmMeasureGroupValue (MEAN)Dispersion
Razuprotafib 10 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib plasma concentration 90 minutes post-dose on Day 164.68 ng/mLStandard Deviation 21.29
Razuprotafib 10 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib Plasma Concentration 90 minutes post-dose on Day 641.04 ng/mLStandard Deviation 25.65
Razuprotafib 10 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib Plasma Concentration 30 minutes post-dose on Day 664.98 ng/mLStandard Deviation 41.03
Razuprotafib 10 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib Plasma Concentration 30 minutes post-dose on Day 187.88 ng/mLStandard Deviation 33.24
Razuprotafib 20 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib plasma concentration 90 minutes post-dose on Day 1124.57 ng/mLStandard Deviation 33.88
Razuprotafib 20 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib Plasma Concentration 30 minutes post-dose on Day 1194.73 ng/mLStandard Deviation 67.2
Razuprotafib 20 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib Plasma Concentration 30 minutes post-dose on Day 6105.82 ng/mLStandard Deviation 71.99
Razuprotafib 20 mgSummary of Razuprotafib Plasma ConcentrationRazuprotafib Plasma Concentration 90 minutes post-dose on Day 678.48 ng/mLStandard Deviation 56.13

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026