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

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

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).

Study Overview

• Status: Completed
• Conditions: Myelofibrosis
• Intervention / Treatment: Drug: Ruxolitinib

Detailed Description

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.

• Study Type: Interventional
• Enrollment (Actual): 41
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Arizona
    • Scottsdale, Arizona, United States
  • Florida
    • Winter Park, Florida, United States
  • Texas
    • Houston, Texas, United States, TX

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

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.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Ruxolitinib 25 mg SR/10, 15, or 20 mg IR; 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; Ruxolitinib was supplied as SR and IR formulated tablets.; Other Names: INCB018424

What is the study measuring?

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

Collaborators and Investigators

• Sponsor: Incyte Corporation
• Investigators: Principal Investigator: Srdan Verstovsek, MD, PhD, M.D. Anderson Cancer Center

Study record dates

Study Major Dates

• Study Start: March 1, 2011
• Primary Completion (Actual): July 1, 2012
• Study Completion (Actual): July 1, 2012

Study Registration Dates

• First Submitted: April 21, 2011
• First Submitted That Met QC Criteria: April 21, 2011
• First Posted (Estimate): April 22, 2011

Study Record Updates

• Last Update Posted (Estimate): March 10, 2014
• Last Update Submitted That Met QC Criteria: February 5, 2014
• Last Verified: December 1, 2013

More Information

Terms related to this study

• Keywords: myeloproliferative neoplasms; myelofibrosis; PMF; PET-MF; PPV-MF
• Additional Relevant MeSH Terms: Bone Marrow Diseases; Hematologic Diseases; Myeloproliferative Disorders; Primary Myelofibrosis
• Other Study ID Numbers: 18424-260