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INCB057643

Phase 1

Healthy Volunteers | Small molecule | Other |Incyte Corporation|Last Updated: Apr 1, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLED
Total Trials1
Total Enrollment48

FDA Designations

No designations recorded

Clinical trial landscape

INCB057643 · 2 trials · 8 indications

Phase 1 2
NCT06941077A Study to Evaluate the Relative Bioavailability of New Formulations of INCB057643 Tablets Administered Orally in Healthy ParticipantsHealthy Volunteers
COMPLETED48 Analytics
NCT04279847Safety and Tolerability Study of INCB057643 in Participants With Myelofibrosis and Other Advanced Myeloid NeoplasmsMyelofibrosis
ACTIVE NOT_RECRUITING140 Analytics
PHASE1COMPLETED
A Study to Evaluate the Relative Bioavailability of New Formulations of INCB057643 Tablets Administered Orally in Healthy Participants
Healthy VolunteersUnlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
Safety and Tolerability Study of INCB057643 in Participants With Myelofibrosis and Other Advanced Myeloid Neoplasms
MyelofibrosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Pharmacokinetics Parameter (PK): Cmax of INCB057643
Up to Day 10

Defined as maximum observed plasma concentration of INCB057643.

Pharmacokinetics Parameter: AUC(0-last) of INCB057643
Up to Day 10

Defined as area under the single-dose serum concentration-time curve from time = 0 to the last measurable concentration at time of INCB057643.

Pharmacokinetics Parameter: AUC 0-∞ of INCB057643
Up to Day 10

Defined as the area under the single-dose serum concentration-time curve extrapolated to time of infinity of INCB057643.

Number of treatment-emergent adverse events
Up to approximately 9 months

Defined as adverse events reported for the first time or worsening of a pre-existing event after first dose of study drug monotherapy and in combination with ruxolitinib.

Secondary Endpoints

Number of participants with Treatment-emergent Adverse Events (TEAEs)
Up to Day 26
Pharmacokinetics Parameter: Tmax of INCB057643
Up to Day 10
Pharmacokinetics Parameter: t1/2 of INCB057643
Up to Day 10
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelCROSSOVER
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: Dose Treatment AEXPERIMENTALINCB057643 will be administered at protocol defined dose.
Cohort 2: Dose Treatment BEXPERIMENTALINCB057643 will be administered at protocol defined dose.
Cohort 3: Dose Treatment CEXPERIMENTALINCB057643 will be administered at protocol defined dose.
Cohort 4: Dose Treatment DEXPERIMENTALINCB057643 will be administered at protocol defined dose.
Cohort 4: Dose Treatment EEXPERIMENTALINCB057643 will be administered at protocol defined dose.
Part 1 : INCB057643 MonotherapyEXPERIMENTALINCB057643 dose escalation and dose expansion
Part 2 : INCB057643 Combination with RuxolitinibEXPERIMENTALCombination arm in dose escalation and dose expansion

Interventions

NameTypeDescription
INCB057643DRUGTablet
RuxolitinibDRUGRuxolitinib will be administered twice a day using the dose described for each Cohort in the protocol for Part 2.
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Ability to comprehend and willingness to sign a written ICF for the study. * Aged 18 to 55 years, inclusive, at the time of signing the ICF. * BMI within the range of 18.0 to 30.0 kg/m2 inclusive. Note: Up to 25% of the participants in each cohort may be enrolled with a BMI \>...

Countries:United StatesCanadaChinaFinlandItalyJapanSpainUnited Kingdom
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Frequently asked questions about INCB057643

What is INCB057643 used for?

INCB057643 is an investigational small molecule being studied for use in myelofibrosis and other advanced myeloid neoplasms, including myelodysplastic syndrome, myeloproliferative neoplasms, and related conditions. It is also being evaluated in healthy volunteers for formulation studies. The drug is in Phase 1 clinical development and is not yet approved.

Who makes INCB057643?

INCB057643 is being developed by Incyte Corporation, a biopharmaceutical company traded on the Nasdaq under the ticker symbol INCY. The company is conducting clinical trials to evaluate the safety and tolerability of this investigational drug in patients with myelofibrosis and other myeloid conditions.

What phase is INCB057643 in?

INCB057643 is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by regulatory authorities. Clinical trials are ongoing to assess its safety, tolerability, and pharmacokinetics in patients with myelofibrosis and related myeloid neoplasms, as well as in healthy volunteers.

What clinical trials is INCB057643 in?

INCB057643 is being studied in two Phase 1 clinical trials. NCT04279847 is an active, not recruiting study evaluating safety and tolerability in participants with myelofibrosis and other advanced myeloid neoplasms, with an enrollment of 140. NCT06941077 is a completed study assessing the relative bioavailability of new tablet formulations in healthy participants.

Is INCB057643 the same as any other drug?

No alternative names for INCB057643 have been reported. The drug is identified solely by its code name INCB057643 in clinical trial registrations and is being developed by Incyte Corporation for the treatment of myelofibrosis and other myeloid malignancies.