A Phase 3 Study of Pacritinib in Patients With Primary Myelofibrosis, Post Polycythemia Vera Myelofibrosis, or Post-Essential Thrombocythemia Myelofibrosis

Study Purpose

This study (study ID PAC203 North America; PAC303 ex-North America) is evaluating 200 mg BID of pacritinib compared to physician's choice (P/C) therapy in patients with MF and severe thrombocytopenia (platelet count <50,000/μL). Approximately 399 patients in total will be enrolled, randomized 2:1 to either pacritinib (approximately 266 patients) or to P/C therapy (approximately 133 patients) Condition or disease: Primary Myelofibrosis/Post-Polycythemia Vera Myelofibrosis/ Post-essential Thrombocythemia Myelofibrosis. Intervention/treatment: Drug-Pacritinib

Recruitment Criteria

Accepts Healthy Volunteers Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms	No
Study Type An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes. An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes. Searching Both is inclusive of interventional and observational studies.	Interventional
Eligible Ages	18 Years and Over
Gender	All

More Inclusion & Exclusion Criteria

Diagnosis and Inclusion Criteria. 1. Primary MF, post-polycythemia vera MF, or post-essential thrombocythemia MF (as defined by Tefferi and Vardiman 2008. 2. Platelet count of <50,000/μL at Screening (Day -35 to Day -3) 3. Dynamic International Prognostic Scoring System Intermediate-1, Intermediate-2, or High-Risk (Passamonti et al 2010. 4. Palpable splenomegaly ≥5 cm below the lower costal margin (LCM) in the midclavicular line as assessed by physical examination. 5. TSS of ≥10 on the MPN-SAF TSS 2.0 or a single symptom score of ≥5 or two symptoms of ≥3, including only the symptoms of left upper quadrant pain, bone pain, itching, or night sweats.The TSS criteria need only to be met on a single day. 6. Age ≥18 years. 7. Eastern Cooperative Oncology Group performance status 0 to 2. 8. Peripheral blast count of <10% throughout the Screening period prior to randomization. 9. Absolute neutrophil count of ≥500/µL. 10. Left ventricular cardiac ejection fraction of ≥50% by echocardiogram or multigated acquisition scan. 11. Adequate liver and renal function, defined by liver transaminases (aspartate aminotransferase [AST]/serum glutamic-oxaloacetic transaminase [SGOT] and alanine aminotransferase [ALT]/serum glutamic pyruvic transaminase [SGPT]) ≤3 × the upper limit of normal (ULN) (AST/ALT ≤5 × ULN if transaminase elevation is related to MF), total bilirubin ≤4 x ULN (in cases where total bilirubin is elevated, direct bilirubin ≤4 × ULN, is required) and creatinine ≤2.5 mg/dL. 12. Adequate coagulation defined by prothrombin time/international normalized ratio and partial thromboplastin time ≤1.5 × ULN. 13. If fertile, willing to use effective birth control methods during the study. 14. Willing to undergo and able to tolerate frequent MRI or CT scan assessments during the study. 15. Able to understand and willing to complete symptom assessments using a patient-reported outcome instrument. 16. Provision of signed informed consent. Exclusion Criteria. 1. Life expectancy <6 months. 2. Completed allogeneic stem cell transplant (allo-SCT) or are eligible for and willing to complete other approved available therapy including allogeneic stem cell. 3. History of splenectomy or planning to undergo splenectomy. 4. Splenic irradiation within the last 6 months. 5. Previously treated with pacritinib. 6. Treatment with any MF-directed therapy within 14 days prior to treatment Day 1. 7. Prior treatment with more than one JAK2 inhibitor. 8. Prior treatment with with ruxolitinib, if BOTH of the following conditions are met: i. exposure to higher-dose ruxolitinib (>10 mg daily) within 120 days prior to treatment Day 1 AND ii. total duration of treatment with higher-dose ruxolitinib (>10 mg daily) was >90 days, from first to last exposure (i.e., this 90-day period starts on the date of first administration of ruxolitinib at a total daily dose of >10 mg and continues for 90 calendar days, regardless of whether higher-dose ruxolitinib is administered continuously or intermittently). 9. Prior treatment with any JAK2 inhibitor other than ruxolitinib, irrespective of dose, with a duration of >90 days. The 90-day period starts on the date of first administration of JAK2 inhibitor therapy and continues for 90 calendar days, regardless of whether therapy is administered continuously or intermittently. 10. Treatment with an experimental therapy within 28 days prior to treatment Day 1. 11. Systemic treatment with a strong cytochrome P450 3A4 inhibitor or a strong cytochrome P450 inducer within 14 days prior to treatment Day 1. Shorter washout periods may be permitted with approval of the Medical Monitor, provided that the washout period is at least five half-lives of the drug prior to treatment Day 1. 12. Significant recent bleeding history defined as National Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE) grade ≥2 within 3 months prior to treatment Day 1, unless precipitated by an inciting event (eg, surgery, trauma, or injury) 13. Systemic treatment with medications that increase the risk of bleeding, including anticoagulants, antiplatelet agents (except for aspirin dosages of ≤100 mg per day), anti-vascular endothelial growth factor (anti-VEGF) agents, and daily use of cyclooxygenase-1 (COX-1) inhibiting non-steroidal anti-inflammatory drugs (NSAIDs) within 14 days prior to treatment Day 1. 14. Systemic treatment with medications that can prolong the QT interval within 14 days prior to treatment Day 1. Shorter washout periods may be permitted with approval of the Medical Monitor, provided that the washout period is at least five half-lives of the drug prior to treatment Day 1. 15. Any history of CTCAE grade ≥2 non-dysrhythmia cardiac conditions within 6 months prior to treatment Day 1. Patients with asymptomatic grade 2 non-dysrhythmia cardiovascular conditions may be considered for inclusion, with the approval of the Medical Monitor, if stable and unlikely to affect patient safety. 16. Any history of CTCAE grade ≥2 cardiac dysrhythmias within 6 months prior to treatment Day 1. Patients with non-corrected QT interval CTCAE grade 2 cardiac dysrhythmias may be considered for inclusion, with the approval of the Medical Monitor, if the dysrhythmias are stable, asymptomatic, and unlikely to affect patient safety. 17. QT corrected by the Fridericia method (QTcF) prolongation >450 ms or other factors that increase the risk for QT interval prolongation (eg, hypokalemia [defined as serum potassium <3.0 mEq/L that is persistent and refractory to correction], or history of long QT interval syndrome). 18. New York Heart Association Class II, III, or IV congestive heart failure. 19. Any active gastrointestinal or metabolic condition that could interfere with absorption of oral medication. 20. Active or uncontrolled inflammatory or chronic functional bowel disorder such as Crohn's Disease, inflammatory bowel disease, chronic diarrhea, or chronic constipation. 21. Other malignancy within 3 years prior to treatment Day 1. The following patients may be eligible despite having had a malignancy within the prior 3 years: patients with curatively treated squamous or basal cell carcinoma of the skin; patients with curatively treated non-invasive cancers; patients with organ-confined prostate cancer with prostate specific antigen (PSA) <20 ng/mL and National Comprehensive Cancer Network risk of Very Low, Low, or Favorable Intermediate; and patients with curatively treated non-metastatic prostate cancer with negative PSA. 22. Uncontrolled intercurrent illness, including, but not limited to, ongoing active infection, psychiatric illness, or social situation that, in the judgment of the treating physician, would limit compliance with study requirements. 23. Known seropositivity for human immunodeficiency (HIV) virus. For patients in France, Czech Republic, and Italy only: testing for HIV is required during Screening. 24. Known active hepatitis A, B, or C virus infection. For patients in France, Czech Republic and Italy only: testing for hepatitis B and C is required during Screening. 25. Women who are pregnant or lactating. 26. Concurrent enrollment in another interventional trial. 27. Severe thrombocytopenia due to vitamin B12 deficiency, folate deficiency, or viral infection in the opinion of the investigator. 28. Known hypersensitivity to pacritinib or any of the following inactive ingredients: microcrystalline cellulose, polyethylene glycol, and magnesium stearate; any contraindication to the "physician's choice" medicinal product selected by the investigator to be used as the comparator or to loperamide or equivalent antidiarrheal medication. 29. Persons deprived of their liberty by a judicial or administrative decision. 30. Persons subject to legal protection measures or unable to express their consent. 31. Temporarily incapacitated persons

Trial Details

Trial ID: This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.	NCT03165734
Phase Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans. Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data. Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs. Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.	Phase 3
Lead Sponsor The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.	CTI BioPharma
Principal Investigator The person who is responsible for the scientific and technical direction of the entire clinical study.	Simran Bedi Singh
Principal Investigator Affiliation	CTI BioPharma
Agency Class Category of organization(s) involved as sponsor (and collaborator) supporting the trial.	Industry
Overall Status	Recruiting
Countries	Australia, Belarus, Bosnia and Herzegovina, Bulgaria, Canada, Czechia, France, Georgia, Germany, Hungary, India, Israel, Italy, Korea, Republic of, Poland, Romania, Russian Federation, Serbia, Spain, Ukraine, United Kingdom, United States
Conditions The disease, disorder, syndrome, illness, or injury that is being studied.	Primary Myelofibrosis, Post-polycythemia Vera Myelofibrosis, Post-essential Thrombocythemia Myelofibrosis

Additional Details

The study is a randomized, controlled phase 3 study comparing the efficacy of pacritinib with P/C therapy in patients with PMF, PPV-MF, or PET-MF (Dynamic International Prognostic Scoring System [DIPSS] risk score of Intermediate-1 to High-Risk), who have had had no or limited exposure to any JAK2 inhibitor or are JAK2 inhibitor-naive, and who have severe thrombocytopenia (platelet count <50,000/µL). This study was designed to use the pacritinib 200 mg BID dose, which was determined to be the optimal dose based on dose- and exposure-response analyses conducted using all available data, including the dosing data from the previous portion of this study. Patients will be randomized 2:1 to receive pacritinib 200 mg BID or the P/C therapy (limited to single drugs from the following list: corticosteroids, hydroxyurea, danazol, or low-dose ruxolitinib). The proposed P/C regimen for a patient must be selected prior to randomization. Randomization will be stratified by prior JAK2 inhibitor therapy (yes/no) and P/C therapy selected prior to randomization. Prior JAK2 inhibitor therapy will be defined as any duration of treatment with a JAK2 inhibitor, such as ruxolitinib, fedratinib, or momelotinib. To be eligible, patients are not allowed to have been treated with more than one JAK2 inhibitor. Assigned treatment will continue until the patient experiences progressive disease or intolerable AEs, withdraws consent, or initiates new MF-directed therapy. No study treatment crossover will be allowed at any time. All patients should complete all visit procedures through Week 24, including patients who stop treatment or have protocol-defined progressive disease prior to Week 24, unless the patient withdraws consent for study procedures, dies, undergoes splenic irradiation or splenectomy, initiates any non-protocol-directed anti-MF treatment, or the study is terminated. In addition to the above, patients will be considered to have discontinued treatment if pacritinib or P/C therapy is held for >28 consecutive days due to treatment toxicity, or if treatment is discontinued for lack of efficacy, or at the request of the principal investigator or the patient. Following the Week 24 assessment, patients who are benefiting from therapy will be allowed to continue receiving the assigned treatment (pacritinib or P/C) until the patient experiences progressive disease, intolerable AEs, withdraws consent, or initiates new MF-directed therapy. All randomized patients will be followed for survival for 2.5 years from the date of randomization unless consent for follow-up is withdrawn.

Arms & Interventions

Arms

Experimental: Pacritinib 200 mg BID

To receive pacritinib 200 mg twice daily (BID) orally, at the same time of day, with or without food

Active Comparator: Physician's Choice (P/C) therapy

The Physician's Choice (P/C) therapy (limited to single drugs from the following list: corticosteroids, hydroxyurea, danazol, or low-dose ruxolitinib). The proposed P/C regimen for a patient must be selected prior to randomization.

Interventions

Drug: - Pacritinib

Oral administration. Supplied in capsules containing 100 mg (as the free base) in red cap/gray body size 0 opaque hard gelatin capsules. The inactive ingredients are microcrystalline cellulose, magnesium stearate, and polyethylene glycol 8000. Each capsule contains 146 mg of pacritinib citrate, which is equivalent to 100 mg pacritinib free base

Drug: - Physician's Choice medications

Physician's Choice medications will be selected and administered according to the investigator's judgement. Investigators can select individual P/C agents but cannot combine agents or give them sequentially.

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Birmingham, Alabama

Status

Active, not recruiting

Address

University of Alabama at Birmingham, (UAB) Hospital, Comprehensive Cancer Center

Birmingham, Alabama, 35294

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