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Myeloproliferative Neoplasm (MPN)Phase 2NCT00726232

Study to Determine the Safety and Efficacy of INCB018424 in Patients With Polycythemia Vera or Essential Thrombocythemia

A Phase 2 study testing Ruxolitinib in people with Myeloproliferative Neoplasm (MPN), run by Incyte Corporation at 4 sites in 2 countries.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

To evaluate the safety and efficacy profile of different treatment regimens of Ruxolitinib (INCB018424) administered to two groups of patients; those with polycythemia vera (PV) and those with essential thrombocythemia (ET). Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Myeloproliferative Neoplasm (MPN)
What is being tested?
Ruxolitinib
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
73 participants
Where
4 sitesin 2 countries
Study dates
20 Aug 2008to 20 Aug 2018
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

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 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Confirmed diagnosis of polycythemia vera or essential thrombocythemia as determined by treating physician
  • Disease refractory to hydroxyurea or for whom treatment with hydroxyurea is contraindicated or have refused further treatment with hydroxyurea due to side effects.
  • Patient meets baseline clinical lab parameters

Who cannot join

  • Treatment with interferon alpha or anagrelide within 7 days and hydroxyurea within 1 day of starting INCB018424.
  • Patients diagnosed with another malignancy unless the malignancy was cervical intraepithelial neoplasia or basal or squamous cell skin cancer and the patient has been disease free for > 3 years
  • Patients receiving therapy with intermediate or high dose steroids greater than the equivalent of 10 mg prednisone per day
  • Clinically significant cardiac disease (New York Heart Association (NYHA) Class III or IV)

Trial locations and contacts

4 sites in 2 countries.

4 sites in 2 countries

Italy3 sites
  • Study site

    Bergamo

  • Study site

    Florence

  • Study site

    Pavia

Other trials in Italy

United States1 site
  • Study site

    Houston, Texas, 77030

Other trials in United States

About this study

Official title: A Phase 2, Open Label, Dose Regimen Ranging Clinical Study to Determine the Safety and Efficacy of INCB018424 in Patients With Advanced Polycythemia Vera or Essential Thrombocythemia Refractory to Hydroxyurea

To evaluate the safety and efficacy profile of different treatment regimens of Ruxolitinib (INCB018424) administered to two groups of patients; those with polycythemia vera (PV) and those with essential thrombocythemia (ET). Patients in each group were refractory to hydroxyurea or for whom hydroxyurea is contraindicated.

Read the detailed description

The study consisted of a 2-stage design, which included a dose-ranging phase (during which patients received treatment at their randomized dose) and an expansion phase (after adjustment of dose/regimen to achieve an optimal balance of efficacy and safety). During the dose-ranging phase, patients in each disease group (PV or ET) were randomly assigned in a 1:1:1 ratio independent of each other to receive 1 of 3 treatment regimens with Ruxolitinib, 10 mg twice daily (bid), 25 mg bid, or 50 mg once daily (qd). After patients completed 2 cycles of treatment with Ruxolitinib at the randomized dose, Investigators were permitted to adjust the dose/regimen on an individual basis using their discretion in order to achieve an optimal balance of efficacy and safety. During the expansion phase (ie, after optimization of dose), additional patients with PV or ET were enrolled to receive Ruxolitinib at the dose that was selected upon review of data from the dose-ranging phase. Treatment continued until a patient met a withdrawal criterion, had intolerable toxicity, progression of disease, or withdrew consent.

Being tested
Ruxolitinib
Medical subject headings
Myeloproliferative Disorders

What participants receive

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

  • RuxolitinibDrug

    Also called INCB018424

    Ruxolitinib was administered orally and supplied as 5 mg and 25 mg tablets.

Study groups in NCT00726232
Study groupRoleWhat they receive
Ruxolitinib 10 mg BIDExperimentalParticipants received 10 mg Ruxolitinib orally twice a day (BID) for 56 days (two 28-day cycles) during the dose-ranging phase. After patients completed 2 cycles of treatment at the randomized dose, Investigators were permitted to adjust the dose/regimen on an individual basis to achieve an optimal balance of efficacy and safety. Treatment continued until a patient met a withdrawal criterion, had intolerable toxicity, progression of disease, or withdrew consent.
Receives: Drug: Ruxolitinib
Ruxolitinib 25 mg BIDExperimentalParticipants received 25 mg Ruxolitinib orally twice a day (BID) for 56 days (two 28-day cycles) during the dose-ranging phase. After patients completed 2 cycles of treatment at the randomized dose, Investigators were permitted to adjust the dose/regimen on an individual basis to achieve an optimal balance of efficacy and safety. Treatment continued until a patient met a withdrawal criterion, had intolerable toxicity, progression of disease, or withdrew consent.
Receives: Drug: Ruxolitinib
Ruxolitinib 50 mg QDExperimentalParticipants received 50 mg Ruxolitinib orally once a day (QD) for 56 days (two 28-day cycles) during the dose-ranging phase. After patients completed 2 cycles of treatment at the randomized dose, Investigators were permitted to adjust the dose/regimen on an individual basis to achieve an optimal balance of efficacy and safety. Treatment continued until a patient met a withdrawal criterion, had intolerable toxicity, progression of disease, or withdrew consent.
Receives: Drug: Ruxolitinib

What is being measured

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

  1. Percentage of Polycythemia Vera Participants With a Confirmed Clinical Partial Response (PR) or Complete Response (CR)

    For a confirmed response all criteria must have been sustained for at least 2 months.

    CR:

    • Hematocrit < 45% in men and < 42% in women
    • No phlebotomy for 1 month
    • No palpable splenomegaly
    • White blood cells < 10 x 10^9/L with normal differential and platelets < 400 x 10^9/L
    • No sustained leucopenia or thrombocytopenia (>2 weeks)
    • No systemic PV symptoms (pruritus, night sweats, bone pain, fever, weight loss)

    PR:

    • Hematocrit < 45% in men and < 42% in women
    • 50% reduction in phlebotomy requirements from 6 months before treatment started
    • 50% reduction in palpable splenomegaly

    Measured: Assessed after 2 cycles (56 days) of treatment on Day 1 of Cycle 3

  2. Percentage of Essential Thrombocythemia (ET) Participants With a Confirmed Clinical Partial Response (PR) or Complete Response (CR)

    For a confirmed response all criteria must have been sustained for at least 2 months.

    Complete Clinical Response:

    • Platelet count < 400 x 10^9/L
    • White blood cell count < 10 x 10^9/L with normal differential and Hematocrit ≤ upper limit of normal
    • Absence of sustained (> 2 weeks) anemia or leucopenia based on institutional normal ranges
    • Absence of systemic ET symptoms (pruritus, bone pain, weakness, night sweats, paresthesias)
    • Absence of palpable splenomegaly

    Partial Clinical Response:

    • Platelet count < 400 x 10^9/L
    • 50% reduction in palpable splenomegaly

    Measured: Assessed after 2 cycles (56 days) of treatment on Day 1 of Cycle 3.

Secondary outcomes (9)
  1. Percentage of Polycythemia Vera Participants Who Achieved Individual Components of Clinical Response at 12 Weeks

    The individual components of clinical response included:

    • Hematocrit (Hct) < 45% without phlebotomy
    • Absence of palpable splenomegaly
    • 50% reduction in spleen size
    • Platelet count ≤ 400 x 10^9/L
    • White blood cell (WBC) count ≤ 10 x 10^9/L

    Measured: Baseline and Week 12 (Cycle 4, Day 1)

  2. Percentage of Polycythemia Vera Participants Who Achieved Individual Components of Clinical Response at 24 Weeks

    The individual components of clinical response included:

    • Hematocrit (Hct) < 45% without phlebotomy
    • Absence of palpable splenomegaly
    • 50% reduction in spleen size
    • Platelet count ≤ 400 x 10^9/L
    • White blood cell (WBC) count ≤ 10 x 10^9/L

    Measured: Baseline and Week 24 (Cycle 7, Day 1)

  3. Percentage of Polycythemia Vera Participants Who Achieved Individual Components of Clinical Response at 36 Weeks

    The individual components of clinical response included:

    • Hematocrit (Hct) < 45% without phlebotomy
    • Absence of palpable splenomegaly
    • 50% reduction in spleen size
    • Platelet count ≤ 400 x 10^9/L
    • White blood cell (WBC) count ≤ 10 x 10^9/L

    Measured: Baseline and Week 36 (Cycle 10, Day 1)

  4. Percentage of Essential Thrombocythemia Participants Who Achieved Individual Components of Clinical Response at 4 Weeks

    The individual components of clinical response included:

    • Platelet count ≤ 400 x 10^9/L
    • White blood cell (WBC) count ≤ 10 x 10^9/L
    • 50% reduction in spleen size
    • Absence of palpable splenomegaly

    Measured: Baseline and 4 weeks (Cycle 2, Day 1)

  5. Percentage of Essential Thrombocythemia Participants Who Achieved Individual Components of Clinical Response at 24 Weeks

    The individual components of clinical response included:

    • Platelet count ≤ 400 x 10^9/L
    • White blood cell (WBC) count ≤ 10 x 10^9/L
    • 50% reduction in spleen size
    • Absence of palpable splenomegaly

    Measured: Baseline and 24 weeks (Cycle 7, Day 1)

  6. Percentage of Essential Thrombocythemia Participants Who Achieved Individual Components of Clinical Response at 36 Weeks

    The individual components of clinical response included:

    • Platelet count ≤ 400 x 10^9/L
    • White blood cell (WBC) count ≤ 10 x 10^9/L
    • 50% reduction in spleen size
    • Absence of palpable splenomegaly

    Measured: Baseline and 36 weeks (Cycle 10, Day 1)

  7. Change From Baseline to Week 4 in Polycythemia Vera Symptoms

    Patients were asked to rate their symptoms on a scale of 0 (none) to 10 (worse possible) for the prior week giving the worst level of symptoms experienced during the preceding 7 days. A negative change from baseline score indicates improvement in symptoms.

    For patients with Polycythemia Vera, queried symptoms included fever, itching/pruritus, bone pain and night sweats.

    Measured: Baseline and Week 4 (Cycle 2, Day 1)

  8. Change From Baseline to Week 4 in Essential Thrombocythemia Symptoms

    Patients were asked to rate their symptoms on a scale of 0 (none) to 10 (worse possible) for the prior week giving the worst level of symptoms experienced during the preceding 7 days. A negative change from baseline score indicates improvement in symptoms.

    For patients with essential thrombocythemia, queried symptoms included itching/pruritus, bone pain, night sweats, paresthesias (tingling or numbness), and weakness.

    Measured: Baseline and Week 4 (Cycle 2, Day 1)

  9. Change From Baseline to Week 4 in Health-related Quality of Life

    Health-related Quality of Life was assessed using the Global Health Status/Quality of Life Scale of the European Organization for the Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30). This scale ranges from 0 to 100, with higher scores indicating higher quality of life.

    Measured: Baseline and Week 4 (Cycle 2, Day 1)

Timeline

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

  1. First posted31 Jul 2008 (estimated)
  2. Study start20 Aug 2008
  3. Primary completion20 Jun 2010
  4. Study completion20 Aug 2018

Why it stopped: Termination of the clinical trial by sponsor.

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 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
73 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT00726232
Sponsor's protocol ID
INCB 18424-256
Other IDs
Ruxolitinib, 2008-001382-28, 2008
Status last verified
Oct 2025
First submitted
29 Jul 2008
Last updated
29 Oct 2025
Data monitoring committee
No
Expanded access
Available

Publications

  • Pieri L, Pancrazzi A, Pacilli A, Rabuzzi C, Rotunno G, Fanelli T, Guglielmelli P, Fjerza R, Paoli C, Verstovsek S, Vannucchi AM. JAK2V617F complete molecular remission in polycythemia vera/essential thrombocythemia patients treated with ruxolitinib. Blood. 2015 May 21;125(21):3352-3. doi: 10.1182/blood-2015-01-624536. No abstract available.

    PubMed 25999444

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Ruxolitinib in people with Myeloproliferative Neoplasm (MPN), run by Incyte Corporation at 4 sites in 2 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 3 inclusion and 4 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: stopped early, as of the sponsor's last update on 29 Oct 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 4 sites in Italy, United States. 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 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

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

Are results available for this study?

Yes. Results are posted in the registry (first posted 24 Feb 2012). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

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?

Percentage of Polycythemia Vera Participants With a Confirmed Clinical Partial Response (PR) or Complete Response (CR) (time frame: Assessed after 2 cycles (56 days) of treatment on Day 1 of Cycle 3). 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 NCT00726232, which also lists 1 linked publication.

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 29 Oct 2025.

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