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ACE-536

Phase 3

Myeloproliferative Disorders | Small molecule | Oncology |Bristol-Myers Squibb Company|Last Updated: Jul 16, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment313

FDA Designations

No designations recorded

Clinical trial landscape

ACE-536 · 2 trials · 6 indications

Phase 3 1Phase 2 1
NCT04717414An Efficacy and Safety Study of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on Concomitant JAK2 Inhibitor Therapy and Who Require Red Blood Cell TransfusionsMyeloproliferative Disorders
ACTIVE NOT_RECRUITING313 Analytics
PHASE3ACTIVE NOT_RECRUITING
An Efficacy and Safety Study of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on Concomitant JAK2 Inhibitor Therapy and Who Require Red Blood Cell Transfusions
Myeloproliferative DisordersUnlock trial analytics

Study Endpoints

Primary Endpoints

Red Blood Cell-transfusion Independence (RBC-TI) ≥ 12 Weeks (RBC-TI 12)
From randomization to week 36 (Approximately 36 Weeks)

Percentage of participants who become RBC-transfusion free over any consecutive 12-week period starting in first 24 weeks.

Determination of the Recommended Dose (RD
Cycle 1 up to the day before Cycle 2 Day 1 or Study Day 22 if not receiving the second treatment cycle

Determine the recommended dose of luspatercept that is safe and tolerable in pediatric participants with transfusion-dependent B-thalassemia or non-transfusion-dependent β-thalassemia

Pharmacokinetics - Cmax
Time from Cycle 1 Day 1 of Treatment Period up to a maximum of 1 year

Maximum serum concentration of drug

Pharmacokinetics - AUC
Time from Cycle 1 Day 1 of Treatment Period up to a maximum of 1 year

Area under the curve

Pharmacokinetics (PK) - t1/2
Time from Cycle 1 Day 1 of Treatment Period up to a maximum of 1 year

Half-life

Pharmacokinetics (PK) - CL/F
Time from Cycle 1 Day 1 of Treatment Period up to a maximum of 1 year

Apparent oral clearance

Pharmacokinetics (PK) - Vd/F
Time from Cycle 1 Day 1 of Treatment Period up to a maximum of 1 year

Apparent volume of distribution

Secondary Endpoints

Red Blood Cell-transfusion Independence (RBC-TI) ≥ 16 Weeks (RBC-TI 16)
From randomization to week 40 (Approximately 40 Weeks)
Observed Duration of Response of RBC-TI 12
From randomization to data cutoff date (Approximately 48.92 Months)
Reduction in Transfusion Burden
Randomization up to week 36 (Approximately week 36)
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Experimental Arm: Luspatercept (ACE-536)EXPERIMENTALLuspatercept will be given to participants via subcutaneous injection (administered on Day 1 of each 21-day treatment cycle)
Control Arm: PlaceboPLACEBO_COMPARATORPlacebo starting dose with volume equivalent to experimental arm subcutaneous injection every 3 weeks (administered on Day 1 of each 21-day treatment cycle)
Cohort 1: TD Dose Escalation Cohort: 12 to < 18 years Luspatercept 0.75 mg/kgEXPERIMENTAL -
Cohort 2: TD Dose Escalation Cohort: 12 to < 18 years: Luspatercept 1.0 mg/kgEXPERIMENTAL -
Cohort 3: TD Dose Expansion Cohort: 12 to <18 years Luspatercept 1.0 mg/kgEXPERIMENTAL -
Cohort 4: TD Dose Escalation Cohort: 6 to < 12 years Luspatercept 1.0 mg/kgEXPERIMENTAL -
Cohort 5: TD Dose Escalation Cohort: 6 to <12 years Luspatercept 1.2 mg/kgEXPERIMENTAL -
Cohort 6: NTD Dose Confirmation Cohort: 12 to < 18 years Luspatercept 1.0 mg/kgEXPERIMENTAL -
Cohort 7: NTD Dose Expansion Cohort: NTD 12 to < 18 yearsEXPERIMENTAL -
Cohort 8: NTD Dose Escalation Cohort: 6 to < 12 years Luspatercept 1.0 mg/kgEXPERIMENTAL -
Cohort 9: NTD Dose Escalation Cohort: 6 to < 12 years Luspatercept 1.2 mg/kgEXPERIMENTAL -

Interventions

NameTypeDescription
ACE-536DRUGSubcutaneous Injection
PlaceboOTHERSubcutaneous Injection
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites185

Subjects must satisfy the following criteria to be randomized in the study: Inclusion Criteria \- Subject is ≥18 years of age at the time of signing the ICF. * Subject has a diagnosis of PMF according to the 2016 World Health Organization (WHO) criteria or diagnosis of post-ET or post-PV MF accor...

Countries:United StatesArgentinaAustraliaAustriaBelgiumCanadaChileChinaColombiaCzechiaFranceGermanyGreeceHong KongHungaryIrelandIsraelItalyJapanLebanonPolandRomaniaRussiaSouth KoreaSpainUnited KingdomIndiaThailandTurkey (Türkiye)
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Recent Changes (Last 90 Days)

LOWJul 17, 2026NCT04717414lastUpdatePostDate: changed
LOWJul 17, 2026NCT04717414lastUpdatePostDate: changed
LOWJul 17, 2026NCT04717414lastUpdatePostDate: changed
MEDIUMJul 10, 2026NCT04143724primaryCompletionDate: changed
MEDIUMJul 10, 2026NCT04143724primaryCompletionDate: changed

Frequently asked questions about ACE-536

What is ACE-536 used for?

ACE-536, also known as luspatercept, is an investigational small molecule being studied for the treatment of beta-thalassemia and myeloproliferative disorders, including myelofibrosis-associated anemia. It is being developed by Bristol-Myers Squibb Company (BMY) and is currently in Phase 2 clinical development.

How does ACE-536 work?

ACE-536 is a small molecule that targets the TGF-beta signaling pathway to promote late-stage erythropoiesis, thereby increasing red blood cell production. This mechanism is being investigated to address anemia in conditions such as beta-thalassemia and myelofibrosis.

Who makes ACE-536?

ACE-536 is being developed by Bristol-Myers Squibb Company, which trades under the ticker symbol BMY. The drug is also known as luspatercept and is currently in Phase 2 clinical trials for hematologic conditions.

What phase is ACE-536 in?

ACE-536 is in Phase 2 clinical development. It is an investigational drug and has not been approved by regulatory authorities. One active Phase 2 trial is recruiting participants with beta-thalassemia, while a Phase 3 trial is also active but not recruiting for myelofibrosis.

What clinical trials is ACE-536 in?

ACE-536 is being studied in two clinical trials. NCT04143724 is a Phase 2 study in pediatric participants with beta-thalassemia, currently recruiting. NCT04717414 is a Phase 3 study in adults with myeloproliferative neoplasm-associated myelofibrosis on JAK2 inhibitor therapy, which is active but not recruiting.

Is ACE-536 the same as luspatercept?

Yes, ACE-536 is also known as luspatercept. Clinical trials for the drug use both names, with luspatercept appearing in the titles of the studies. The drug is being developed by Bristol-Myers Squibb for beta-thalassemia and myeloproliferative disorders.