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A Study to Evaluate Safety and Efficacy of Selinexor Versus Treatment of Physician's Choice in Participants With Previously Treated Myelofibrosis

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT04562870
Recruitment Status : Active, not recruiting
First Posted : September 24, 2020
Last Update Posted : May 26, 2023
Sponsor:
Information provided by (Responsible Party):
Karyopharm Therapeutics Inc

Study Description
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Brief Summary:
This is a Phase 2, multicenter, two-arm, open-label study to evaluate the safety and efficacy of selinexor versus treatment per physician's choice (PC) in participants with myelofibrosis (MF) who had at least 6 months of treatment with a Janus kinase (JAK)1/2 inhibitor. Study participants will be randomized in a 1:1 ratio to either receive selinexor or physicians' choice of treatment.

Condition or disease Intervention/treatment Phase
Myelofibrosis Drug: Selinexor Other: Physician's Choice Treatment Phase 2

Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 112 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase 2, Randomized, Open-Label, Multicenter Study to Evaluate Safety and Efficacy of Single Agent Selinexor Versus Treatment of Physician's Choice in Patients With Previously Treated Myelofibrosis
Actual Study Start Date : March 17, 2021
Estimated Primary Completion Date : January 6, 2025
Estimated Study Completion Date : January 6, 2025

Resource links provided by the National Library of Medicine

Drug Information available for: Selinexor

Arms and Interventions
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Arm Intervention/treatment
Experimental: Arm S: Selinexor
Participants with MF who had previously received at least 6 months of treatment with JAK 1/2 inhibitor will receive a dose of selinexor 80 mg in first 2 cycles followed by selinexor 60 mg in subsequent cycles orally on Days 1, 8, 15, and 22 of each 28-day cycle to participants on Arm S.
 Drug: Selinexor
Unit Dose Strength: 20 mg; Dose Formulation: Tablet; Dosage Level: 60 or 80 mg, QW; Route of Administration: Oral
Active Comparator: Arm PC: Physician's Choice Treatment
Participants with MF who had previously received at least 6 months of treatment with JAK 1/2 inhibitor will receive Physician's choice treatment which will be administered as per clinical practice.
 Other: Physician's Choice Treatment
Physician's choice treatment may include ruxolitinib retreatment, fedratinib, chemotherapy (e.g., hydroxyurea), anagrelide, corticosteroid, hematopoietic growth factor, immunomodulatory agent, androgen, interferon (all as per clinical practice) and may include supportive care only with no MF treatment; no investigational therapies are allowed.


Outcome Measures
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Primary Outcome Measures :
  1. Percentage of Participants with Spleen Volume Reduction of Greater Than or Equal to (≥) 35 Percent (%) (SVR35) Assessed by Independent Review Committee (IRC) [ Time Frame: From Baseline up to Week 48 ]

Secondary Outcome Measures :
  1. Percentage of Participants with Total Symptom Score Reduction of ≥50% (TSS50) Measured by Myelofibrosis Symptom Assessment Form (MFSAF) V4.0, Based on Local Assessment [ Time Frame: From Baseline up to end of last cycle (approximately 48 months) ]
  2. Percentage of Participants with Spleen Volume Reduction of ≥25% (SVR25) Assessed by IRC [ Time Frame: From Baseline up to Week 48 ]
  3. Overall Survival (OS) [ Time Frame: From Baseline up to 12 months after end of treatment (approximately 60 months) ]
  4. Percentage of Participants with Anemia Response Assessed by International Working Group-Myeloproliferative Neoplasms Research and Treatment (IWG-MRT ) [ Time Frame: From Baseline up to 28 Days after last dose (approximately 48 months) ]
  5. Duration of Spleen Volume Reduction of ≥35% (SVR35) Assessed by IRC [ Time Frame: From Baseline up to 28 Days after last dose (approximately 48 months) ]
  6. Duration of Spleen Volume Reduction of ≥25% (SVR25) Assessed by IRC [ Time Frame: From Baseline up to 28 Days after last dose (approximately 48 months) ]
  7. Duration of Total Symptom Score is ≥50% (TSS50) Based on Local Assessment [ Time Frame: From Baseline up to 28 Days after last dose (approximately 48 months) ]
  8. Overall Response Rate (ORR) Assessed by IWG-MRT [ Time Frame: From Baseline up to 28 Days after last dose (approximately 48 months) ]
  9. Number of Participants With Treatment-emergent Adverse Events (TEAEs) by Severity Grade ≥3, Serious Adverse event (SAEs), and AEs Leading to Treatment Discontinuation [ Time Frame: From first dose of study treatment up to 30 days after end of treatment (approximately 48 months) ]
  10. Pharmacokinetic (PK) Parameter: Area Under the Plasma Concentration-time Curve (AUC) of Selinexor [ Time Frame: Cycle 2 Day 1: 1, 2, 4, 6, and 24 hours post dose (each cycle is 28 days) ]
  11. PK Parameter: Maximum Plasma Concentration (Cmax) of Selinexor [ Time Frame: Cycle 2 Day 1: 1, 2, 4, 6, and 24 hours post dose (each cycle is 28 days) ]

Eligibility Criteria
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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • A diagnosis of primary MF or post-essential thrombocythemia (ET) or post-polycythemia (PV) MF according to the 2016 World Health Organization (WHO) classification of myeloproliferative neoplasms (MPN), confirmed by the most recent local pathology report.
  • Previous treatment with JAK inhibitors for at least 6 months.
  • Measurable splenomegaly during the screening period as demonstrated by spleen volume of ≥450 centimeter cube (cm^3) by magnetic resonance imaging (MRI) or computerized tomography (CT) scan.

  • Relapsed, Refractory or Intolerant to JAK inhibitors as defined as meeting one of the criteria below:

    • less than (<) 35% spleen volume reduction by MRI or CT-scan (from baseline) or
    • <50% decrease in spleen size by palpation (from baseline) or an increase of at least 3 cm with the spleen at least 5 cm below the left costal margin or
    • Spleen volume increase greater than (>) 25% from nadir or a return to within 10% of baseline after any initial response or
    • Treatment with JAK inhibitor was complicated by development of red blood cells (RBC) transfusion requirement (2 units per month for 2 month); or grade 3 thrombocytopenia, anemia, hematoma/hemorrhage; or grade 2 non-hematologic toxicity while on JAK inhibitors
  • Participants ≥18 years of age.
  • Eastern Cooperative Oncology Group (ECOG) less than or equal to (≤) 2.
  • Platelet count ≥75*10^9 per liter (/L).
  • Absolute neutrophil count (ANC) ≥1.5*10^9/L.
  • Serum direct bilirubin ≤1.5*upper limit of normal (ULN); aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤2.5*ULN.
  • Calculated creatinine clearance (CrCl) >15 milliliter (mL)/minute (min) based on the Cockcroft and Gault formula.
  • Participants with active hepatitis B virus (HBV) are eligible if antiviral therapy for hepatitis B has been given for >8 weeks and viral load is <100 International Units (IU)/mL.
  • Participants with untreated hepatitis C virus (HCV) are eligible if there is a documentation of negative viral load per institutional standard.
  • Participants with history of human immunodeficiency virus (HIV) are eligible if they have cluster of differentiation 4 (CD4)+ T-cell counts ≥350 cells/microliter (mcL), negative viral load per institutional standard, and no history of acquired immunodeficiency syndrome (AIDS)-defining opportunistic infections in the last year.
  • Female participants of childbearing potential must have a negative serum pregnancy test at screening and agree to use highly effective methods of contraception throughout the study and for at least 90 days after the last dose of selinexor, or for the duration as stated on the label (SmPC/USPI) for those on the comparator drug (physician's choice arm). Childbearing potential excludes: Age >50 years and naturally amenorrhoeic for >1 year, or previous bilateral salpingo-oophorectomy, or hysterectomy.
  • Male participants who are sexually active must use highly effective methods of contraception throughout the study and for at least 90 days after the last dose of selinexor, or for the duration as stated on the label (SmPC/USPI) for those on the comparator drug (physician's choice arm). Male participants must agree not to donate sperm during the study treatment period.
  • Participants must sign written informed consent in accordance with federal, local and institutional guidelines.

Exclusion Criteria:

  • >5% blasts in peripheral blood or >10% blasts in bone marrow (i.e., accelerated phase).
  • Previous treatment with selinexor or other exportin 1 (XPO1) inhibitors.
  • Use of any standard or experimental anti-MF therapy <21 days prior to Cycle 1 Day 1 (hydroxyurea or growth factors are allowed).
  • Impairment of gastrointestinal (GI) function or GI disease that could significantly alter the absorption of selinexor (Example: vomiting, or diarrhea that is Common Terminology Criteria for Adverse Events (CTCAE) grade >1).
  • Received strong cytochrome P450 3A (CYP3A) inhibitors ≤7 days prior to selinexor dosing or strong CYP3A inducers ≤14 days prior to selinexor dosing.
  • Major surgery <28 days prior to cycle 1 day 1 (C1D1).
  • Uncontrolled (ie, clinically unstable) infection requiring parenteral antibiotics, antivirals, or antifungals within 7 days prior to first dose of study treatment; however, prophylactic use of these agents is acceptable (including parenteral).
  • Any life-threatening illness, medical condition, or organ system dysfunction which, in the Investigator's opinion, could compromise the participants safety, prevent the participant from giving informed consent, or being compliant with the study procedures.
  • Female participants who are pregnant or lactating.
  • Participants with contraindications to use of selinexor or all the drugs intended to be used in the comparative treatment arm.
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04562870


Locations
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Sponsors and Collaborators
Karyopharm Therapeutics Inc
More Information
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Responsible Party: Karyopharm Therapeutics Inc
ClinicalTrials.gov Identifier: NCT04562870    
Other Study ID Numbers: XPORT-MF-035
2020-003809-60 ( EudraCT Number )
First Posted: September 24, 2020    Key Record Dates
Last Update Posted: May 26, 2023
Last Verified: May 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Karyopharm Therapeutics Inc:
Myelofibrosis
Selinexor
Total Symptom Score
Spleen Volume Reduction
Anemia response
TSS50
SVR35
SVR25
 KPT-330
JAK1
JAK2
XPOVIO
SINE
XPORT-MF-035
Karyopharm
Additional relevant MeSH terms:
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Primary Myelofibrosis
Myeloproliferative Disorders
Bone Marrow Diseases
Hematologic Diseases