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CompletedNCT04655586ASPENUpdated Feb 21, 2023Results posted

Assessing Safety, Hospitalization and Efficacy of rNAPc2 in COVID-19

A Phase 2/3 interventional study of rNAPc2 and Heparin in Covid19, sponsored by ARCA Biopharma, Inc.. Completed at 24 sites in 3 countries. Open to participants aged 18 Years to 90 Years. Per ClinicalTrials.gov, last updated 2023-02-21.

Sponsored by ARCA Biopharma, Inc. · Phase 2/3, Interventional, and Treatment

Phase
Phase 2/3
Study type
Interventional
Enrollment
160
Allocation
Randomized
Ages
18 Years to 90 Years
Sex
All
01

Study summary

Sequential randomized, multicenter, active comparator study to evaluate the hypothesis that rNAPc2 (AB201), a novel, potent and highly selective tissue factor inhibitor with anticoagulant, anti-inflammatory and potential antiviral properties, shortens time to recovery compared to heparin in hospitalized patients with COVID-19 and elevated D-dimer levels.

Read the detailed description

Sequential randomized, multicenter, active comparator study to evaluate the hypothesis that rNAPc2, a novel, potent and highly selective tissue factor inhibitor with anticoagulant, anti-inflammatory and potential antiviral properties, shortens time to recovery compared to heparin in hospitalized patients with COVID-19 and elevated D-dimer levels. Study participants and Clinical Endpoint Committee (CEC) members assessing the clinical endpoints will be blinded to treatment assignment. The protocol comprises sequential Phase 2b and Phase 3 studies. Analysis of Phase 2b data could lead to study discontinuation, adjustment of eligibility criteria or sample size, and will inform the rNAPc2 dose level to be studied in Phase 3.

02

Conditions studied

  • Covid19

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Keywords

  • D-dimer
  • Thromboprophylaxis
  • Anti-coagulant
  • Thrombotic Events
  • Coagulation
  • Inflammation
  • Heparin
03

In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's enrollment of 160 is above the median of 100 across 4,099 interventional studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

ARCA Biopharma, Inc. is the lead sponsor of 10 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 90 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  1. Age ≥ 18 years and ≤ 90 years at the Screening assessment
  2. Weight ≥ 50 kg at randomization
  3. Hospitalized with a diagnosis of COVID-19 and in need of inpatient medical care
  4. Positive for SARS-CoV-2 on nasopharyngeal, oropharyngeal or other tissue/body fluid samples by PCR or validated other test of ongoing infection (not an antibody test for prior exposure), within seven (7) days of hospitalization or screening assessment
  5. D-dimer level > upper limit of normal at screening
  6. Provided electronic or written informed consent, either personally or through a legally authorized representative (LAR)
  7. Must agree not to participate in a concurrent interventional study involving anticoagulation or anti-platelet therapy
  8. Female patients of reproductive or child-bearing potential must be willing to use an effective method of contraception for the duration of the study, and male patients must be willing to use an effective method of contraception to avoid partner pregnancy and abstain from sperm donation for at least 90 days after last dose

Exclusion criteria

Exclusion Criteria:

  1. High bleeding risk, e.g. major surgery within prior 1 month, history of a major bleed while receiving anticoagulation, recent hemorrhagic stroke, current or planned (during current hospitalization) dual anti-platelet therapy, platelet count \<25,000/uL, current therapeutic anticoagulation for a medical indication other than COVID-19, e.g. atrial fibrillation, known thrombosis, hereditary or acquired coagulopathy treated with therapeutic anticoagulation. Patients receiving prophylactic anticoagulation are eligible if they are willing to discontinue current anticoagulation.
  2. Sustained systolic blood pressure \< 90 mmHg considered to be clinically significant
  3. Persistent eGFR \<20 ml/min/1.73m2
  4. Known severe liver disease (e.g. bilirubin >3.5 mg/dL (60 umol/L))
  5. Life expectancy estimated to be \< 72 hours based on current clinical condition
  6. Anticipated hospital discharge or transfer within 5 days based on current clinical condition
  7. Known anti-phospholipid syndrome
  8. Unable to receive heparin, e.g. history of heparin-induced thrombocytopenia and thrombosis (HITT)
  9. Participation in any interventional clinical study with an investigational product within seven (7) days of the Screening assessment or within 5 half-lives of the investigational agent, whichever is longer
05

Study design

Phase
Phase 2 / Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Outcomes assessor)
Enrollment
160 participants (actual)

Study arms

  • Experimental
    rNAPc2 Higher Dose

    loading dose of 7.5 μg/kg SC on Day 1 followed by 5 μg/kg SC on Days 3 and 5

    Drug: rNAPc2

  • Experimental
    rNAPc2 Lower Dose

    loading dose of 5 ug/kg SC on Day 1 followed by 3 ug/kg SC on Days 3 and 5

    Drug: rNAPc2

  • Active comparator
    Heparin

    heparin at either prophylactic or therapeutic doses per Standard of Care at Institution

    Drug: Heparin

Interventions

  • DrugrNAPc2

    two dose levels of rNAPc2

    Also known as: AB201, Recombinant Nematode Anticoagulant Protein c2

  • DrugHeparin

    standard of care heparin per institution (therapeutic or prophylactic regimen)

06

What researchers measure

Primary outcomes

  1. Proportional Change in D-dimer Level From Baseline to Day 8, or Day of Discharge if Prior to Day 8 (Phase 2b)

    Proportional change is represented as percent change, and is defined as: 100 × (D-Dimer level at Day 8 or early discharge - D-Dimer level at baseline) / D-Dimer level at baseline. Baseline and post-baseline D-Dimer results are tested in the same laboratory, i.e. both from central laboratory, or local laboratory paired samples if the central laboratory values are not available.

    Time frame: 8 days

Secondary outcomes

  1. Proportional Change in D-dimer Level From Baseline to 24 Hours Post-dose (Day 2) and Day 3 (Phase 2b)

    Proportional change is represented as percent change, and is defined as: 100 × (D-Dimer level at Day 2/3 or early discharge - D-Dimer level at baseline)/D-Dimer level at baseline. Baseline and post-baseline D-Dimer results are tested in the same laboratory.

    Time frame: 2 days and 3 days

  2. Number of Major or Non-major Clinically Relevant Bleeding Events Within Eight (8) Days of Randomization as Compared to Heparin (Phase 2b)

    Clinical events as reported by site. ISTH= International Society on Thrombosis and Haemostasis, TIMI= Thrombolysis in Myocardial Infarction. Heparin Dosing Strategy as indicated by Investigator. Where subjects have more than one bleeding event recorded, only the highest level of severity was summarized.

    Time frame: 8 days

  3. Number of Major or Non-major Clinically Relevant Bleeding Events With rNAPc2 vs. Heparin Through Day 30 (Phase 2b)

    Clinical events as reported by site. ISTH= International Society on Thrombosis and Haemostasis, TIMI= Thrombolysis in Myocardial Infarction. Heparin Dosing Strategy as indicated by Investigator. Where subjects have more than one bleeding event recorded, only the highest level of severity was summarized.

    Time frame: 30 days

  4. Change in High Sensitivity C-reactive Protein Laboratory Values From Baseline Through Day 8 (Phase 2b)

    Central lab samples collected per protocol. Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

    Time frame: 8 days

  5. Change in Interleukin-6 Laboratory Values From Baseline Through Day 8 (Phase 2b)

    Central lab samples collected per protocol. Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

    Time frame: 8 days

  6. Change in Tissue Factor Laboratory Values From Baseline Through Day 8 (Phase 2b)

    Central lab samples collected per protocol. Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

    Time frame: 8 days

  7. Change in Antiphospholipid Antibodies Laboratory Values From Baseline Through Day 8 (Anti-Beta 2 Glycoprotein IgG) (Phase 2b)

    Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

    Time frame: 8 days

07

Results

Posted Feb 21, 2023

Participant flow

Eligible participants were men and women (18 to 90 years) with a confirmed COVID-19 diagnosis requiring inpatient medical care and an elevated D-dimer level at screening. Enrollment began DEC2020 with the last assessment in MAR2022. 160 participants were enrolled at 15 clinical sites in Argentina, Brazil, and the United States. Originally designed as a sequential Phase 2B/3, the Ph2B top line results dictated substantial design changes for progression to Ph3 and the study was concluded at Ph2.

Participant flow — Overall Study
MilestonerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Started404080
Completed383475
Not completed265
Withdrew: Physician decision134
Withdrew: Withdrawal by subject131

Outcome measures

PrimaryProportional Change in D-dimer Level From Baseline to Day 8, or Day of Discharge if Prior to Day 8 (Phase 2b)

Proportional change is represented as percent change, and is defined as: 100 × (D-Dimer level at Day 8 or early discharge - D-Dimer level at baseline) / D-Dimer level at baseline. Baseline and post-baseline D-Dimer results are tested in the same laboratory, i.e. both from central laboratory, or local laboratory paired samples if the central laboratory values are not available.

Time frame:
8 days
Reported as:
Mean · Percent change
Proportional Change in D-dimer Level From Baseline to Day 8, or Day of Discharge if Prior to Day 8 (Phase 2b)
Percent changerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Proportional Change in D-dimer Level From Baseline to Day 8, or Day of Discharge if Prior to Day 8 (Phase 2b)137 ± 422.341.4 ± 194.634.7 ± 133.2
Statistical analysis
  • rNAPc2 Lower Dose vs rNAPc2 Higher Dose vs Heparin · Wilcoxon Rank Sum · p = 0.4715 (All rNAPc2 vs. Heparin)
SecondaryProportional Change in D-dimer Level From Baseline to 24 Hours Post-dose (Day 2) and Day 3 (Phase 2b)

Proportional change is represented as percent change, and is defined as: 100 × (D-Dimer level at Day 2/3 or early discharge - D-Dimer level at baseline)/D-Dimer level at baseline. Baseline and post-baseline D-Dimer results are tested in the same laboratory.

Time frame:
2 days and 3 days
Reported as:
Mean · percentage change
Proportional Change in D-dimer Level From Baseline to 24 Hours Post-dose (Day 2) and Day 3 (Phase 2b)
percentage changerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Day 2 (24h post D1 dose)23.9 ± 213.9-0.1 ± 40.343.5 ± 317.5
Day 3 (48h post D1 dose)65.8 ± 264.5-2.3 ± 68.521.5 ± 147.3
Statistical analysis
  • rNAPc2 Lower Dose vs rNAPc2 Higher Dose vs Heparin · Wilcoxon Rank Sum · p = 0.1883
SecondaryNumber of Major or Non-major Clinically Relevant Bleeding Events Within Eight (8) Days of Randomization as Compared to Heparin (Phase 2b)

Clinical events as reported by site. ISTH= International Society on Thrombosis and Haemostasis, TIMI= Thrombolysis in Myocardial Infarction. Heparin Dosing Strategy as indicated by Investigator. Where subjects have more than one bleeding event recorded, only the highest level of severity was summarized.

Time frame:
8 days
Reported as:
Count of participants · Participants
Number of Major or Non-major Clinically Relevant Bleeding Events Within Eight (8) Days of Randomization as Compared to Heparin (Phase 2b)
ParticipantsrNAPc2 Lower DoserNAPc2 Higher DoseHeparin
ISTH Major or Non-Major Clinically Relevant001
Subjects with any ISTH if Major101
TIMI Major001
TIMI Minor000
TIMI Medical attention000
TIMI Minimal100
SecondaryNumber of Major or Non-major Clinically Relevant Bleeding Events With rNAPc2 vs. Heparin Through Day 30 (Phase 2b)

Clinical events as reported by site. ISTH= International Society on Thrombosis and Haemostasis, TIMI= Thrombolysis in Myocardial Infarction. Heparin Dosing Strategy as indicated by Investigator. Where subjects have more than one bleeding event recorded, only the highest level of severity was summarized.

Time frame:
30 days
Reported as:
Count of participants · Participants
Number of Major or Non-major Clinically Relevant Bleeding Events With rNAPc2 vs. Heparin Through Day 30 (Phase 2b)
ParticipantsrNAPc2 Lower DoserNAPc2 Higher DoseHeparin
ISTH Major or Non-Major Clinically Relevant111
ISTH Major011
ISTH Non-major Clinically Relevant100
ISTH Not Clinically Relevant210
Subjects With Any ISTH if Major321
TIMI Major001
TIMI Minor010
TIMI medical attention100
TIMI Minimal210
SecondaryChange in High Sensitivity C-reactive Protein Laboratory Values From Baseline Through Day 8 (Phase 2b)

Central lab samples collected per protocol. Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

Time frame:
8 days
Reported as:
Mean · percent change
Change in High Sensitivity C-reactive Protein Laboratory Values From Baseline Through Day 8 (Phase 2b)
percent changerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Change in High Sensitivity C-reactive Protein Laboratory Values From Baseline Through Day 8 (Phase 2b)-26.1 ± 203.9270.9 ± 1556.812.8 ± 226.3
Statistical analysis
  • rNAPc2 Lower Dose vs rNAPc2 Higher Dose vs Heparin · Wilcoxon Rank Sum · p = 1.0
SecondaryChange in Interleukin-6 Laboratory Values From Baseline Through Day 8 (Phase 2b)

Central lab samples collected per protocol. Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

Time frame:
8 days
Reported as:
Mean · percentage change
Change in Interleukin-6 Laboratory Values From Baseline Through Day 8 (Phase 2b)
percentage changerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Change in Interleukin-6 Laboratory Values From Baseline Through Day 8 (Phase 2b)317.4 ± 821.7768.1 ± 1798.38.4 ± 113.8
Statistical analysis
  • rNAPc2 Lower Dose vs rNAPc2 Higher Dose vs Heparin · Wilcoxon Rank Sum · p = 0.0254
SecondaryChange in Tissue Factor Laboratory Values From Baseline Through Day 8 (Phase 2b)

Central lab samples collected per protocol. Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

Time frame:
8 days
Reported as:
Mean · percentage change
Change in Tissue Factor Laboratory Values From Baseline Through Day 8 (Phase 2b)
percentage changerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Change in Tissue Factor Laboratory Values From Baseline Through Day 8 (Phase 2b)-21.2 ± 56.3-1.8 ± 89.223.3 ± 103.6
Statistical analysis
  • rNAPc2 Lower Dose vs rNAPc2 Higher Dose vs Heparin · Wilcoxon Rank Sum · p = 0.0535
SecondaryChange in Antiphospholipid Antibodies Laboratory Values From Baseline Through Day 8 (Anti-Beta 2 Glycoprotein IgG) (Phase 2b)

Proportional change is represented as percent change, and is defined as: 100 × (Biomarker level at Day 8 or early discharge - Biomarker level at baseline)/Biomarker level at baseline.

Time frame:
8 days
Reported as:
Mean · percentage change
Change in Antiphospholipid Antibodies Laboratory Values From Baseline Through Day 8 (Anti-Beta 2 Glycoprotein IgG) (Phase 2b)
percentage changerNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Change in Antiphospholipid Antibodies Laboratory Values From Baseline Through Day 8 (Anti-Beta 2 Glycoprotein IgG) (Phase 2b)-24.04 ± 51.84-274.3 ± 1562.5762.99 ± 479.75
Statistical analysis
  • rNAPc2 Lower Dose vs rNAPc2 Higher Dose vs Heparin · Wilcoxon Rank Sum · p = 0.8300

Adverse events

Collected over All AEs were collected from the time of randomization until the participant completed Day 30 or final contact, whichever was longer. All SAEs were collected from the time of consent until the participant completed Day 30 or final contact, whichever was longer. For most participants the final visit/contact was at Day 30 (up to 40 days after screening) or later if delayed due to challenges reaching the participant or obtaining final follow-up information (up to Day 251).. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
rNAPc2 Lower Dose5/38 (13.2%)18/38 (47.4%)18/38 (47.4%)
rNAPc2 Higher Dose5/38 (13.2%)29/38 (76.3%)18/38 (47.4%)
Heparin6/80 (7.5%)26/80 (32.5%)36/80 (45%)
Most frequent serious events
Showing 10 of 32
Most frequent serious events
EventrNAPc2 Lower DoserNAPc2 Higher DoseHeparin
COVID-19 pneumoniaInfections and infestations4/386/385/80
Respiratory failureRespiratory, thoracic and mediastinal disorders0/385/384/80
Acute kidney failureRenal and urinary disorders3/382/380/80
Acute kidney injuryRenal and urinary disorders0/383/382/80
Septic shockInfections and infestations2/380/381/80
PneumothoraxRespiratory, thoracic and mediastinal disorders1/380/383/80
Respiratory arrestRespiratory, thoracic and mediastinal disorders0/381/381/80
Acute respiratory distress syndromeRespiratory, thoracic and mediastinal disorders1/380/380/80
Chronic kidney diseaseRenal and urinary disorders1/380/380/80
Urinary tract infectionInfections and infestations1/380/381/80
Most frequent other events
Most frequent other events
EventrNAPc2 Lower DoserNAPc2 Higher DoseHeparin
Metabolism and nutrition disorderMetabolism and nutrition disorders2/388/3810/80
COVID-19 PneumoniaInfections and infestations5/384/385/80
Respiratory failureRespiratory, thoracic and mediastinal disorders1/385/386/80
Acute kidney injryRenal and urinary disorders3/385/382/80
Cardiac disordersCardiac disorders1/381/387/80
Gastrointestinal disordersGastrointestinal disorders1/383/384/80
General disorders and administrative site conditionsGeneral disorders1/383/383/80
Vascular disordersVascular disorders1/381/385/80
Transaminases increaseInjury, poisoning and procedural complications2/380/380/80
Blood and lymphatic system disordersBlood and lymphatic system disorders2/381/383/80

Baseline characteristics

The study was designed as a sequential Phase 2B/3 trial whereby both trial phases were nested in a common protocol. When the 2B top line results dictated substantial design changes for progression to Phase 3 the study was concluded as a Phase 2 trial.

Age, Categorical
Age, Categorical(Participants)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
<=18 years0000
Between 18 and 65 years303053113
>=65 years10102747
Age, Continuous
Age, Continuous(years)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
Mean53.9 ± 13.2952.8 ± 12.657.6 ± 12.855.5 ± 13
Sex: Female, Male
Sex: Female, Male(Participants)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
Female16213269
Male24194891
Race (NIH/OMB)
Race (NIH/OMB)(Participants)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
American Indian or Alaska Native3014
Asian0000
Native Hawaiian or Other Pacific Islander0011
Black or African American1081634
White273262121
More than one race0000
Unknown or Not Reported0000
Region of Enrollment
Region of Enrollment(participants)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
Argentina1124
United States383874150
Brazil1146
WHO COVID Severity
WHO COVID Severity(Participants)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
Mild26225098
Severe14183062
D-Dimer (ng/mL)
D-Dimer (ng/mL)(ng/mL)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
Mean450.8 ± 533.8517.4 ± 588.3864.2 ± 1794.8680.1 ± 1354
D-dimer stratification (%)
D-dimer stratification (%)(Participants)rNAPc2 Lower DoserNAPc2 Higher DoseHeparinTotal
<= 2x Upper limit of normal18203573
> 2x Upper limit of normal22204587

1 further baseline measures are reported on the registry.

08

Study locations

24 sites
  • ARCA Investigational Site #119
    Fairhope, Alabama 36532, United States
  • ARCA Investigational Site #118
    Phoenix, Arizona 85006, United States
  • ARCA Investigational Site #120
    Tucson, Arizona 85724, United States
  • ARCA Investigational Site #104
    Aurora, Colorado 80045, United States
  • ARCA Investigational Site #117
    Denver, Colorado 80204, United States
  • ARCA Investigational Site #101
    Jacksonville, Florida 32209, United States
  • ARCA Investigational Site #128
    Evanston, Illinois 60201, United States
  • ARCA Investigational Site #113
    New Orleans, Louisiana 70121, United States
  • ARCA Investigational Site #105
    Falls Church, Virginia 22042, United States
  • ARCA Investigational Site #114
    Richmond, Virginia 23230, United States
  • ARCA Investigational Site #103
    Tacoma, Washington 98405, United States
  • ARCA Investigational Site #127
    San Nicolás, Buenos Aires, Argentina
  • ARCA Investigational Site #130
    Rosario, Santa Fe, Argentina
  • ARCA Investigational Site #112
    Rosario, Sante Fe, Argentina
  • ARCA Investigational Site #111
    Buenos Aires, Argentina
  • ARCA Investigational Site #115
    Caba, Argentina
  • ARCA Investigational Site #126
    Cordoba, Argentina
  • ARCA Investigational Site #129
    San Miguel de Tucuman, Argentina
  • ARCA Investigational Site #106
    San Miguel De Tucumán, Argentina
  • ARCA Investigational Site #125
    Campo Grande, Mato Grosso Do Sul, Brazil
  • ARCA Investigational Site #124
    Braganca Paulista, Sao Paolo, Brazil
  • ARCA Investigational Site #122
    Sao Jose do Rio Preto, Sao Paolo, Brazil
  • ARCA Investigational Site #123
    Porto Alegre, Brazil
  • ARCA Investigational Site #121
    São Paulo, Brazil
09

References and documents

Study documents

  • Study protocol · Jul 7, 2021
  • Statistical analysis plan · Feb 24, 2022
  • Informed consent form · Jul 7, 2021

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: No

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Feb 21, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT04655586
Lead sponsor
ARCA Biopharma, Inc.
Collaborators
Colorado Prevention Center
Responsible party
Sponsor
First posted
Dec 7, 2020
Start date
Dec 10, 2020
Primary completion
Dec 6, 2021
Completion
Mar 7, 2022
Results posted
Feb 21, 2023
Last update
Feb 21, 2023

Study contacts

Marc Bonaca, MD, MPH
principal investigator · CPC Clinical Research

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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