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Sickle Cell DiseasePhase 1NCT05169580

Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of Pociredir

A Phase 1 study testing Pociredir oral capsule(s) in people with Sickle Cell Disease and Sickle Cell Anemia, run by Fulcrum Therapeutics at 18 sites in 3 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This is a study to evaluate the safety, tolerability, pharmacokinetics and pharmacodynamics of Pociredir in participants with sickle cell disease. Read more about this study

Who is it for?
Ages 18 to 65 years
Conditions the study is for
Sickle Cell Disease, Sickle Cell Anemia
What is being tested?
Pociredir oral capsule(s)
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
45 participants
Where
18 sitesin 3 countries
Study dates
13 Dec 2021to 20 Jan 2026
Phase
Phase 1
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Participant is 18 to 65 years of age, inclusive at the time informed consent is obtained.
  • Documented SCD at the time of screening (S/S, S/β0, S/β+, and S/C only) as confirmed through review of medical records or HPLC.
  • Participants who meet at least one the following criteria:
  • ≥4 to 10 episodes of SCD pain crisis over 12 months, or ≥2 to 5 over 6 months prior to screening
  • ≥2 episodes of SCD pain crisis plus at least one of the following over previous 12 months: i) Acute chest syndrome (ACS) ii. Hepatic or splenic sequestration iii. Priapism
  • ≥2 of the following events over the previous 12 months:i. ACS ii. Hepatic or splenic sequestration iii. Priapism
Show all 18Show fewer
  • Tricuspid regurgitant jet velocity (TRV) ≥ 3.0 meter/second(m/s) OR TRV ≥ 2.5 m/s + N-terminal pro b-type natriuretic peptide (NT-proBNP) plasma level ≥ 160 picogram per milliliter; OR documented ongoing pulmonary hypertension diagnosed from previous echocardiogram or right-sided heart catheterization with mean pulmonary artery pressure > 25 millimeter of mercury;
  • SCD-related chronic kidney disease (CKD)
  • Meet medical criteria to receive (e.g., post-cerebrovascular accident) but are contraindicated for chronic transfusions (e.g., alloimmunization, transfusion reactions)
  • Previous experience with Hydroxyurea (HU) but have shown to be unresponsive and/or intolerant or ineligible AND
  • Previous experience with a stable dose of voxelotor, crizanlizumab, and/ or L-glutamine but have shown to be unresponsive and/or intolerant or ineligible
  • Per Investigator's recommendation, participants may continue crizanlizumab and/or L-glutamine but must be on a stable dose for at least 6 months
  • HbF ≤ 20% of total Hb
  • Total Hb ≥ 5.5 g/dL and ≤ 12 g/dl (males) or ≤ 10.6 g/dl (females) at screening.
  • Participant must meet both of the following laboratory values at screening:
  • Absolute neutrophil count ≥ 1.5 × 10^9 per liter (/l)
  • Platelets ≥ 80 × 10^9/l
  • Absolute reticulocyte count at screening ≥ 100 x 10^9/l.

Who cannot join

  • Sickle cell complication requiring care from a medical provider in hospital or emergency care setting in the 14 days prior to starting study drug.
  • History of bone marrow transplant or human stem cell transplant or gene therapies.
  • • Participants with a history of severe renal disease defined as estimated glomerular filtration rate < 30 mL/min/1.73m^2. Participants on dialysis of any kind are excluded.
  • Participants receiving regularly scheduled transfusions or therapeutic phlebotomies, or any participant who has been transfused within 60 days prior to initiating study drug.
  • Participant with active malignancy, or history of cancer (except for squamous cell skin cancer, basal cell skin cancer, and stage 0 cervical carcinoma in situ, with no recurrence for the last 5 years), or has an immediate family member with known or suspected familial cancer syndrome. Known presence of a chromosomal abnormality or genetic mutation that may put the participant at an increased risk of myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML).
  • Participant currently on HU, or have received HU, within 60 days prior to initiating study drug.

Trial locations and contacts

18 sites in 3 countries.

18 sites in 3 countries

United States14 sites
  • Sonar Research Center

    Atlanta, Georgia, 30315

  • Our Lady of the Lake Hospital

    Baton Rouge, Louisiana, 70808

  • Boston Medical Center

    Boston, Massachusetts, 02118

  • University of North Carolina at Chapel Hill

    Chapel Hill, North Carolina, 27599

  • University of Illinois Chicago

    Chicago, Illinois, 60612

  • Inova Schar Cancer Institute

    Fairfax, Virginia, 22031

  • Eastern Carolina University

    Greenville, North Carolina, 27834

  • University of Texas Houston

    Houston, Texas, 77030

  • Queens Hospital Cancer Center

    Jamaica, New York, 11432

  • University of Arkansas for Medical Sciences (UAMS)

    Little Rock, Arkansas, 72205

  • University of California, Los Angeles

    Los Angeles, California, 90095

  • Lynn Health Science Institute

    Oklahoma City, Oklahoma, 73112

  • Virginia Commonwealth University

    Richmond, Virginia, 23298

  • Jacobi Medical Center

    The Bronx, New York, 10461

Other trials in United States

Nigeria3 sites
  • National Hospital, Abuja

    Abuja, 900247

  • University of Ibadan

    Ibadan, 200212

  • Barau Dikko Teaching Hospital

    Kaduna, 800125

Other trials in Nigeria

South Africa1 site
  • Charlotte Maxeke Johannesburg Academic Hospital

    Johannesburg, 2193

Other trials in South Africa

About this study

Official title: A Phase 1 Open-Label, Multiple-Dose Study to Evaluate Safety and Tolerability, Pharmacokinetics and Pharmacodynamics of FTX-6058 in Subjects With Sickle Cell Disease (SCD)

This is a study to evaluate the safety, tolerability, pharmacokinetics and pharmacodynamics of Pociredir in participants with sickle cell disease.

Read the detailed description

This is a Phase 1 multicenter, international, open-label study evaluating the safety, tolerability, pharmacokinetics (PK), fetal hemoglobin (HbF) induction and biological activity of Pociredir in participants 18-65 years of age, inclusive, with SCD.

Participants will receive 12 weeks of dosing with 4 weeks of follow-up. Approximately 10 participants will be enrolled in each cohort. A maximum of 3 participants with SCD HbSC+ genotype may be enrolled in each cohort.

Cohort 1 will receive 6 milligrams (mg) of Pociredir by mouth once daily. Doses for subsequent cohorts will be determined following review by the Data Monitoring Committee [DMC]. A total of seven cohorts may be included. Cohort 2 will be dosed at 2 mg once daily by mouth, and cohort 3 will be dosed at 12 mg once daily by mouth. The Sponsor will reinitiate enrolment in the 3rd cohort (12 mg cohort) with the updated inclusion and exclusion criteria. Based on review of available safety and biomarker data and with the recommendation of the DMC, a subsequent 4th cohort of 20 mg and potentially a 5th cohort of 30 mg may be initiated. Additional cohorts using alternative dosing schedules may be considered based on available data.

The primary endpoints of the study are to evaluate the safety and tolerability of Pociredir as measured by the frequency of adverse events and to evaluate single and multiple-dose pharmacokinetics of Pociredir in participants with sickle cell disease. Secondary endpoints include evaluating the effect of Pociredir on fetal hemoglobin induction in peripheral blood and evaluating the effects of Pociredir on hemolysis in participants with sickle cell disease.

Being tested
Pociredir oral capsule(s)
Keywords
Sickle Cell Disease, Sickle Cell Anemia, Pharmacokinetics, Pharmacodynamics, Pociredir, Open label
Medical subject headings
Anemia, Sickle Cell

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Pociredir oral capsule(s)Drug

    Also called FTX-6058

    Participants will receive Pociredir

Study groups in NCT05169580
Study groupRoleWhat they receive
Pociredir oral capsule(s) in Sickle Cell participantsExperimentalCohort 1 will receive 6 mg of Pociredir by mouth once daily. Cohort 2 will be dosed at 2 mg once daily by mouth, and cohort 3 will be dosed at 12 mg once daily by mouth. The Sponsor will reinitiate enrolment in the 3rd cohort (12 mg cohort) with the updated inclusion and exclusion criteria. Based on review of available safety and biomarker data and with the recommendation of the DMC, a subsequent 4th cohort of 20 mg and potentially a 5th cohort of 30 mg may be initiated. A total of seven cohorts may be included. Following the first cohort, doses for all subsequent cohorts will be determined following DMC review of the safety and pharmacokinetic data observed in participants from the prior and ongoing cohorts. Alternate dosing schedules may be evaluated in some of the cohorts.
Receives: Drug: Pociredir oral capsule(s)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Treatment-Emergent Adverse Events

    To evaluate the safety and tolerability of Pociredir in adult participants with sickle cell disease based on the frequency of adverse events (AEs) and changes in clinically significant laboratory test results, vital signs and electrocardiograms (ECGs) parameters.

    Measured: Up to approximately 16 weeks of monitoring

  2. Plasma Concentrations of Pociredir

    Blood samples will be collected to measure the plasma concentration of Pociredir at specified timepoints.

    Measured: Days 1, 14, 28, 42, 56, 70, 84 and 91

Secondary outcomes (5)
  1. Change from Baseline in percentage fetal hemoglobin (%HbF) biomarkers in peripheral blood

    The percentage of HbF will be measured in peripheral whole blood.

    Measured: Baseline and at Days 1, 14, 28, 42, 56, 70, 84, 91, and 112

  2. Change from Baseline in % Reticulocytes

    The percentage of reticulocytes will be measured in peripheral whole blood.

    Measured: Baseline and at Days 1, 14, 28, 42, 56, 70, 84, 91, and 112

  3. Change from Baseline in Absolute Reticulocyte Count

    The absolute reticulocyte count will be measured in peripheral whole blood.

    Measured: Baseline and at Days 1, 14, 28, 42, 56, 70, 84, 91, and 112

  4. Change from Baseline in Red cell distribution width

    Blood samples will be collected for the analysis of hematology parameter: red cell distribution width

    Measured: Baseline and at Days 1, 14, 28, 42, 56, 70, 84 and 91

  5. Change from Baseline in unconjugated bilirubin

    Blood samples will be collected for the analysis of clinical chemistry parameter: unconjugated bilirubin

    Measured: Baseline and at Days 1, 14, 28, 42, 56, 70, 84 and 91

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Dec 2021
  2. Study start13 Dec 2021
  3. Primary completion20 Jan 2026
  4. Study completion20 Jan 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Sequential
Model description
Open-label, multiple-dose study.
Masking
None (open label)
Enrolment
45 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05169580
Sponsor's protocol ID
6058-SCD-101
Status last verified
Feb 2026
First submitted
14 Dec 2021
Last updated
12 Feb 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Publications

  • Ngo DA, Aygun B, Akinsheye I, Hankins JS, Bhan I, Luo HY, Steinberg MH, Chui DH. Fetal haemoglobin levels and haematological characteristics of compound heterozygotes for haemoglobin S and deletional hereditary persistence of fetal haemoglobin. Br J Haematol. 2012 Jan;156(2):259-64. doi: 10.1111/j.1365-2141.2011.08916.x. Epub 2011 Oct 24.

    PubMed 22017641
  • Piel FB, Steinberg MH, Rees DC. Sickle Cell Disease. N Engl J Med. 2017 Apr 20;376(16):1561-1573. doi: 10.1056/NEJMra1510865. No abstract available.

    PubMed 28423290
  • Sankaran VG, Orkin SH. The switch from fetal to adult hemoglobin. Cold Spring Harb Perspect Med. 2013 Jan 1;3(1):a011643. doi: 10.1101/cshperspect.a011643.

    PubMed 23209159
  • Saraf SL, Molokie RE, Nouraie M, Sable CA, Luchtman-Jones L, Ensing GJ, Campbell AD, Rana SR, Niu XM, Machado RF, Gladwin MT, Gordeuk VR. Differences in the clinical and genotypic presentation of sickle cell disease around the world. Paediatr Respir Rev. 2014 Mar;15(1):4-12. doi: 10.1016/j.prrv.2013.11.003. Epub 2013 Nov 15.

    PubMed 24361300
  • Steinberg MH, Chui DH, Dover GJ, Sebastiani P, Alsultan A. Fetal hemoglobin in sickle cell anemia: a glass half full? Blood. 2014 Jan 23;123(4):481-5. doi: 10.1182/blood-2013-09-528067. Epub 2013 Nov 12.

    PubMed 24222332
  • Abbasi M, Srivastava A, Saraf SL. Management of Kidney Disease with Sickle Cell Disease. J Am Soc Nephrol. 2025 Oct 1;36(10):2041-2054. doi: 10.1681/ASN.0000000804. Epub 2025 Jun 26.

    PubMed 40569673

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Pociredir oral capsule(s) in people with Sickle Cell Disease and Sickle Cell Anemia, run by Fulcrum Therapeutics at 18 sites in 3 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 18 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 12 Feb 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 18 sites in United States, Nigeria, South Africa. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Treatment-Emergent Adverse Events (time frame: Up to approximately 16 weeks of monitoring). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05169580, which also lists 6 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 12 Feb 2026.

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