Study of Ruxolitinib (INCB018424) Sustained Release Formulation in Myelofibrosis Patients

Study Overview
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Brief Summary
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The purpose of this study is to determine the safety and tolerability of ruxolitinib (INCB018424) sustained release (SR) formulation in participants with primary myelofibrosis (PMF), post-polycythemia vera MF (PPV-MF), and post-essential thrombocythemia MF (PET-MF).

Detailed Description
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The study will enroll approximately 40 participants with PMF, PPV-MF or PET-MF. Participants will take ruxolitinib SR once daily for 16 consecutive weeks and then transition to a comparable twice daily dose regimen of ruxolitinib using the immediate release (IR) tablets which have been under investigation in controlled Phase 1, 2, and 3 clinical trials. Participants receiving benefit from treatment with ruxolitinib may continue further participation with IR tablets up to the time when the last participant completed Week 36 or the commercial availability of ruxolitinib IR, whichever was earlier. Follow-up will occur at least 30 days following the last dose of ruxolitinib.

Official Title
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An Open-label Assessment of Once-daily Dosing of a Sustained Release (SR) Formulation of INCB018424 in Patients With Primary Myelofibrosis, Post-essential Thrombocythemia Myelofibrosis, and Post-polycythemia Vera Myelofibrosis

Conditions
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Myelofibrosis

Intervention / Treatment
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* Drug: Ruxolitinib


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Participants 18 years of age or older. Participants must be diagnosed with primary myelofibrosis (PMF), post-essential thrombocythemia myelofibrosis (PPV-MF), or post-polycythemia vera myelofibrosis (PET-MF). Participants with myelofibrosis requiring therapy must be classified as high risk (3 or more prognostic factors), intermediate risk level 2 (2 prognostic factors), or intermediate risk level 1 (1 prognostic factor)defined by International Working Group for Myelofibrosis Research and Treatment (IWG-MRT). Participants must have a palpable spleen measuring 5 cm or greater below the costal margin. Exclusion Criteria: Participants with a life expectancy of less than 6 months. Participants of childbearing potential who are unwilling to take appropriate precautions to avoid pregnancy or fathering a child. Participants with inadequate bone marrow reserve. Participants with history of platelet counts < 50,000/μL, platelet transfusion(s), or an absolute neutrophil count < 500/μL in the month prior to Screening. Participants with inadequate liver or renal function at Screening and Baseline visits.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Ruxolitinib 25 mg SR/10, 15, or 20 mg IR<br>Participants began administration with 25 mg ruxolitinib sustained release (SR) once daily (QD). After 8 weeks, if there was inadequate efficacy, the dose level could be titrated to 50 mg SR QD or 25 mg SR every other day (QOD) alternating with 50 mg SR QOD. At Week 16, participants transitioned to ruxolitinib 10, 15, or 20 mg immediate release (IR) orally twice daily. Participants who continued to demonstrate benefit in the opinion of the investigator could remain on ruxolitinib IR until the last participant completed Week 36 or the commercial availability of ruxolitinib IR, whichever was earlier; the dose received was based on platelet counts at the time of transition. | Drug: Ruxolitinib<br>* Ruxolitinib was supplied as SR and IR formulated tablets.<br>* Other names: INCB018424;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With at Least 1 Adverse Event From Baseline Through Week 16 |  | Baseline to Week 16 | 
| Overall Response (OR) at Week 16 | The investigator graded OR according to the International Working Group for Myelofibrosis Research and Therapy criteria for treatment response. As bone marrow biopsies were not taken after baseline, the best achievable response was clinical improvement which required 1 of the following in the absence of progressive disease (PD): (1) A ≥ 2 g/dL increase in hemoglobin level or (2) either a palpable ≥ 50% reduction of splenomegaly of a spleen ≥ 10 cm at baseline or a spleen palpable at > 5 cm at baseline becoming not palpable. PD required 1 of the following: (1) Progressive splenomegaly defined by the appearance of previously absent splenomegaly that was palpable at > 5 cm below the left costal margin or a ≥ 100% increase in palpable distance for baseline splenomegaly of 5-10 cm or a ≥ 50% increase in palpable distance for baseline splenomegaly of > 10 cm or (2) an increase in peripheral blood blast percentage to ≥ 20% that lasted for ≥ 8 weeks. Stable disease: None of the above. | Baseline to Week 16 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in Spleen Volume at Week 16 | Spleen volume was measured by magnetic resonance imaging (or by computed tomography [CT] in applicable participants). Scans were read by a central reader. Spleen volume was obtained by outlining the circumference of the organ and determining the volume using the validated technique of least squares. | Baseline to Week 16 | 
| Change From Baseline in Spleen Length at Week 16 | Spleen length was measured in centimeters by palpation. | Baseline to Week 16 | 
| Percentage of Participants With ≥ 35% Reduction in Spleen Volume at Week 16 From Baseline | Spleen volume was measured by magnetic resonance imaging (or by computed tomography [CT] in applicable participants). Scans were read by a central reader. Spleen volume was obtained by outlining the circumference of the organ and determining the volume using the validated technique of least squares. | Baseline to Week 16 | 
| Change From Baseline in the Total Symptom Score at Week 16 | Symptoms of myelofibrosis were assessed using the modified Myelofibrosis Symptom Assessment Form v2.0 diary that was to be completed by participants each night. The 7 symptoms (night sweats, itchiness, abdominal pain, pain under the ribs on left side, feeling of fullness [early satiety], bone/muscle pain, inactivity) were each rated on a scale from 0 (absent) to 10 (worst imaginable). The total symptom score was the sum of 6 of the 7 symptoms (inactivity was not included) and ranged from 0 to 60. A lower score indicated fewer symptoms. A negative change score indicated improvement. | Baseline to Week 16 | 
| Percentage of Participants With a ≥ 50% Reduction From Baseline in the Total Symptom Score at Week 16 | Symptoms of myelofibrosis were assessed using the modified Myelofibrosis Symptom Assessment Form v2.0 diary that was to be completed by participants each night. The 7 symptoms (night sweats, itchiness, abdominal pain, pain under the ribs on left side, feeling of fullness [early satiety], bone/muscle pain, inactivity) were each rated on a scale from 0 (absent) to 10 (worst imaginable). The total symptom score was the sum of 6 of the 7 symptoms (inactivity was not included) and ranged from 0 to 60. A lower score indicated fewer symptoms. | Baseline to Week 16 | 
| Maximum Observed Plasma Concentration (Cmax) of Ruxolitinib 25 mg SR on Day 1 | Blood samples were collected prior to and at 0.5, 1, 2, 3, 4, 6, and 9 hours after administration of ruxolitinib 25 mg SR on Day 1 of the study. The concentration of ruxolitinib was determined in plasma samples by a validated LC/MS/MS assay. Standard non-compartmental pharmacokinetic methods were used to analyze the ruxolitinib plasma concentration data using WinNonlin® version 6.0.0 (Pharsight Corporation, Mountain View, CA). Cmax was taken directly from the observed plasma concentration data. | Day 1 | 
| Time to Reach the Maximum Plasma Concentration (Tmax) of Ruxolitinib 25 mg SR on Day 1 | Blood samples were collected prior to and at 0.5, 1, 2, 3, 4, 6, and 9 hours after administration of ruxolitinib 25 mg SR on Day 1 of the study. The concentration of ruxolitinib was determined in plasma samples by a validated LC/MS/MS assay. Standard noncompartmental pharmacokinetic methods were used to analyze the ruxolitinib plasma concentration data using WinNonlin® version 6.0.0 (Pharsight Corporation, Mountain View, CA). Tmax was taken directly from the observed plasma concentration data. | Day 1 | 
| Area Under the Plasma Concentration-time Curve (AUC) of Ruxolitinib 25 mg SR on Day 1 | Blood samples were collected prior to and at 0.5, 1, 2, 3, 4, 6, and 9 hours after administration of ruxolitinib 25 mg SR on Day 1 of the study. The concentration of ruxolitinib was determined in plasma samples by a validated LC/MS/MS assay. The area under the plasma concentration-time curve (AUC) was derived from the plasma concentrations using a non-compartmental method and computed using the linear trapezoidal rule for increasing concentrations and the log-trapezoidal rule for decreasing concentrations with the software WinNonlin® version 6.0.0 (Pharsight Corporation, Mountain View, CA). | Day 1 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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PET-MF, myelofibrosis, myeloproliferative neoplasms, PMF, PPV-MF