Study of the JAK Inhibitor Ruxolitinib Administered Orally to Patients With Primary Myelofibrosis (PMF), Post-Polycythemia Vera-Myelofibrosis (PPV-MF) or Post-Essential Thrombocythemia-Myelofibrosis (PET-MF)

August 20, 2025 updated by: Incyte Corporation

A Phase Ib, Open-label, Dose-finding Study of the JAK Inhibitor INC424 Tablets Administered Orally to Patients With Primary Myelofibrosis (PMF), Post-polycythemia Veramyelofibrosis (PPV-MF) or Post-essentialthrombocythemia-myelofibrosis (PET-MF) and Baseline Platelet Counts ≥50 x109/L and <100 x109/L (EXPAND)

This is a Phase IB, open-label, dose-finding study of the JAK 1 and 2 inhibitor ruxolitinib in patients with myelofibrosis (MF). The study consists of two periods: the core study period, comprising the dose escalation stage and the safety extension phase up to Week 24, then the extension study period beyond Week 24 and up to 3 years, to further characterize the safety and efficacy of ruxolitinib in this patient population. The dose escalation phase will enroll successive cohorts of patients who receive increasing doses of ruxolitinib until the maximum safe starting dose (MSSD) is determined. In the safety expansion phase, additional patients will be treated with ruxolitinib at the MSSD defined during dose escalation. The primary objective is to establish the MSSD of ruxolitinib in patients with MF and starting platelet counts < 100 x 10 ^9/L

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
69

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Expanded Access

Expanded Access

A way for patients with serious diseases or conditions who cannot participate in a clinical trial to gain access to a medical product that has not been approved by the U.S. Food and Drug Administration (FDA). Also called compassionate use. There are different expanded access types.
Approved

Approved

  • Available: Expanded access is currently available for this investigational treatment, and patients who are not participants in the clinical study may be able to gain access to the drug, biologic, or medical device being studied.
  • No longer available: Expanded access was available for this intervention previously but is not currently available and will not be available in the future.
  • Temporarily not available: Expanded access is not currently available for this intervention but is expected to be available in the future.
  • Approved for marketing: The intervention has been approved by the U.S. Food and Drug Administration for use by the public.
 for sale to the public. See expanded access record.

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Austria
      • Vienna, Austria
  • China
      • Beijing, China
    • Jiangsu
      • Nanjing, Jiangsu, China
    • Sichuan
      • Chengdu, Sichuan, China
    • Zhejiang
      • Hangzhou, Zhejiang, China
  • France
      • Angers, France
      • Paris, France
      • Pierre-Benite, France
  • Germany
      • Leipzig, Germany
  • Italy
      • Firenze, Italy
      • Milano, Italy
      • Terni, Italy
  • Netherlands
      • Rotterdam, Netherlands
  • United Kingdom
      • Belfast, United Kingdom
      • London, United Kingdom
  • United States
    • Florida
      • Winter Park, Florida, United States, 32789
    • Maryland
      • Baltimore, Maryland, United States, 21229
    • Texas
      • Houston, Texas, United States, 77030

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Require treatment for MF and classified at least as intermediate risk level 1 defined by the International Working Group.
  • Platelet count < 100x10 ^9/L at screening or at Study Day 1.

Exclusion Criteria:

  • Received platelet transfusion within 14 days prior to Screening evaluations.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Stratum -1
Participants with baseline Platelet counts of 75-99 x10^9/L
Drug: Ruxolitinib

Starting dose of ruxolitinib for cohort 1 in dose escalation phase - 5mg twice a day (BID)

Doses will be increased a total of approximately 5mg for successive dosing cohorts based on baseline platelet count

Other Names:
  • INCB018424
Experimental: Stratum -2
Participants with baseline Platelet counts of 50-74 x10^9/L
Drug: Ruxolitinib

Starting dose of ruxolitinib for cohort 1 in dose escalation phase - 5mg twice a day (BID)

Doses will be increased a total of approximately 5mg for successive dosing cohorts based on baseline platelet count

Other Names:
  • INCB018424

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Number of Participants With Dose Limiting Toxicities
Time Frame: 28 days
DLT was defined as the occurrence of any of the following treatment-related toxicities, occurring through Day 28: Any grade ≥ 2 hemorrhagic event ; Any grade thrombocytopenia requiring PLT transfusion; PLT count < 25x109/L*; Grade 4 neutropenia (absolute neutrophil count < 0.5x109/L)*; Grade ≥ 3 febrile neutropenia*; Grade ≥ 2 total serum bilirubin with coincident direct bilirubin ≥ 0.5 mg/dL; Grade 3 non-hematologic toxicity for ≥ 7 consecutive days; Grade 4 non-hematologic toxicity. In the dose escalation stage in the core study period, the starting does in both strata was 5mg bid. Successive cohorts of newly enrolled patients received increasing doses of ruxolitinib until the Maximum Safe Starting Dose (MSSD) was determined. Initially, only patients with PLT counts 75-99 x10^9/L (stratum 1) were allowed to be enrolled. Once safety was established in stratum 1 at the first 2 dose cohorts, eligible population was further expanded to patients with PLT counts 50-74 x10^9/L (stratum 2).
28 days

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Number of Treatment Emergent Adverse Events (TEAE's)
Time Frame: approximately 4 years
Adverse events reported for the first time or worsening of a pre-existing event after first dose of study drug/treatment.
approximately 4 years
Number of Subjects Achieving ≥ 50% Reduction in Palpable Spleen Length
Time Frame: 24 weeks
Participants achieving ≥ 50% reduction in palpable spleen length relative to study day 1 by treatment and stratum
24 weeks
Change in Spleen Length as Measure by Palpation Over Time
Time Frame: Day 8, 15, 22, 29, 43, 57, 85, 113, 141, 168, 252, 336, 420, 504, 588, 672, 756, 1008, 1092
Defined as measurement of change in spleen length by palpation from baseline
Day 8, 15, 22, 29, 43, 57, 85, 113, 141, 168, 252, 336, 420, 504, 588, 672, 756, 1008, 1092
PK- C Reactive Protein Levels by PK Quartile (AUC0-12)
Time Frame: 24 weeks
To define the PK and C Reactive Protein relationship using PK Quartiles (AUC 0-12, ng*h/mL)
24 weeks
PK- Interleukin 1 Receptor Antagonist Levels by PK Quartile (AUC0-12)
Time Frame: 24 weeks
To define the PK and Interleukin 1 Receptor Antagonist relationship relationship using PK Quartiles (AUC 0-12, ng*h/mL)
24 weeks
PK- Tissue Necrosis Factor Receptor 2 Levels by PK Quartile (AUC0-12)
Time Frame: 24 weeks
To define the PK and Tissue Necrosis Factor Receptor 2 relationship using PK Quartiles (AUC 0-12, ng*h/mL)
24 weeks
AUC 0-Inf
Time Frame: 0.25 to 0.75, 1 to 3, and 4 to 12 hours postdose on Day 1 and predose, 0.25 to 0.75 hours, and 1 to 3 hours postdose on Day 15, with a random sample on Days 29 and 57
Area Under the Serum Concentration Versus Time Curve，Time 0 to Infinity
0.25 to 0.75, 1 to 3, and 4 to 12 hours postdose on Day 1 and predose, 0.25 to 0.75 hours, and 1 to 3 hours postdose on Day 15, with a random sample on Days 29 and 57

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Incyte Corporation

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Novartis

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Mark Jones, MD, Incyte Corporation

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 31, 2011

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2019

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2019

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
March 14, 2011

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 16, 2011

First Posted (Estimated)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
March 17, 2011

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 22, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 20, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CINC424A2201
  • 2010-023055-29 (EudraCT Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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