Thrombocythemia, Essential, Primary Myelofibrosis, Myelofibrosis, Post-polycythemia Vera Myelofibrosis, Post-essential Thrombocythemia Myelofibrosis, Polycythemia Vera
Conditions
Brief summary
The primary purpose of the study is to transition participants into an extension study to collect long-term safety and efficacy data. The study will include participants who are safely tolerating bomedemstat, receiving clinical benefit from its use in estimation of the investigator, and have shown the following criteria: * Participants from the IMG-7289-202/MK-3543-005 (NCT05223920) study must have received at least 6 months of treatment with bomedemstat; * Essential thrombocythemia (ET) and polycythemia vera (PV) participants from studies other than IMG-7289-202/MK-3543-005 must have achieved confirmed hematologic remission. No hypothesis testing will be conducted in this study.
Interventions
DRUGBomedemstat
10, 15, 20, and 50 mg oral capsules
Sponsors
Merck Sharp & Dohme LLC
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Is from a bomedemstat study sponsored by Imago BioSciences, Inc. (a subsidiary of Merck \& Co., Inc.) or MSD, and established by the Sponsor as MK-3543-017 ready * Has received at least 6 months of treatment with bomedemstat in the IMG-7289-202/MK-3543-005 study, while safely tolerating bomedemstat, and receiving clinical benefit from its use in the estimation of the investigator * ET and PV participants from established feeder studies other than IMG-7289- 202/MK-3543-005 must have achieved confirmed hematologic remission, must be safely tolerating bomedemstat, and must be receiving clinical benefit from its use in the estimation of the investigator * Is not currently on a dose hold * Participant must be able to swallow oral medication and follow instructions for at-home dosing of bomedemstat
Exclusion criteria
* Has received prohibited concomitant medications * Ongoing or planned participation in another investigational study * Has noncompliance in prior bomedemstat study receiving \<90% of assigned doses excluding suspensions or holds as assigned by the investigator
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Percentage of participants with one or more adverse events (AEs) | Up to ~10 years | An AE is any undesirable physical, psychological or behavioral effect experienced by a patient during participation in an investigational study, in conjunction with the use of the drug or biologic, whether or not product-related. This includes any untoward signs or symptoms experienced by the patient from the time of first dose with bomedemstat under this protocol until completion of the study. The percentage of participants with AEs will be presented. |
| Percentage of participants who discontinued study treatment due to an AE | Up to ~10 years | An AE is any undesirable physical, psychological or behavioral effect experienced by a patient during participation in an investigational study, in conjunction with the use of the drug or biologic, whether or not product-related. This includes any untoward signs or symptoms experienced by the patient from the time of first dose with bomedemstat under this protocol until completion of the study. The percentage of participants who discontinued study treatment due to an AE will be presented. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| For participants with ET or PV: Duration of clinicohematologic response | Up to ~10 years | For participants who showed durable clinicohematologic response (DCHR) in their feeder studies, duration of clinicohematologic response is defined as the time from the first documented evidence of confirmed reduction of platelet and white blood cell (WBC) count until confirmed increase of platelet and WBC counts to above acceptable threshold, thrombotic or major hemorrhagic events or disease progression to myelofibrosis (MF), myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML). The duration of clinicohematologic response will be reported. |
| For participants with ET or PV: Duration of hematologic remission | Up to ~10 years | For participants who showed confirmed hematologic remission in their feeder studies, duration of hematologic remission is defined as the time from the first documented evidence of confirmed reduction of platelet and WBC count until confirmed increase of platelet and WBC counts to above acceptable threshold. The duration of hematologic remission will be reported. |
| For participants with ET or PV: Percentage of participants with transformation to MF or MDS/AML | Up to ~10 years | Disease Progression is defined as the transformation to post-ET myelofibrosis (ET participants only), post-PV myelofibrosis (PV participants only), spleen volume increase ≥25% (MF participants only), myelodysplastic syndrome, or acute myeloid leukemia as assessed by the investigator. The percentage of participants with transformation to MF or MDS/AML will be reported. |
| For participants with MF: Percentage of participants with worsening of splenomegaly or transformation to MDS/AML | Up to ~10 years | Spleen volume will be assessed by magnetic resonance imaging (MRI) (or computed tomography \[CT\] where applicable) at pre-specified timepoints. The percentage of participants with worsening of splenomegaly or transformation to MDS/AML will be reported. |
| For participants with MF, ET, or PV: Percentage of participants with thrombotic events | Up to ~10 years | Thrombotic events are defined as: new or recurrent acute myocardial infarction; unstable angina; stroke; transient ischemic attack (TIA); deep venous thrombosis (DVT); pulmonary embolism (PE); thrombotic digital ischemia; other thrombotic events such as peripheral limb ischemia or Budd-Chiari syndrome that are assessed to be due to underlying PV; other vascular occlusive events such as symptoms of cardiac, abdominal or peripheral limb ischemia supported by objective evidence of vessel disease and/or ischemia. The percentage of participants with thrombotic events will be presented. |
| For participants with MF, ET, or PV: Percentage of participants with major hemorrhagic events | Up to ~10 years | Hemorrhagic events are defined as: Major Bleeding (MB) Events such as fatal bleeding, and/or symptomatic bleeding in a critical area or organ such as intracranial, intraspinal, intraocular, retroperitoneal, intra-articular or pericardial, or intramuscular with compartment syndrome, and/or bleeding causing a fall in hemoglobin level of 2 g/dL or more, or leading to transfusion of 2 or more units of whole blood or red cells; Clinically Relevant Non-Major Bleeding (CRNMB) Events Leading to hospitalization or increased level of care or clinically important, prompting a face-to-face medical evaluation. The percentage of participants with major hemorrhagic events will be presented. |
Countries
Australia, Hong Kong, Italy, New Zealand, United Kingdom, United States
Contacts
CONTACTToll Free Number
STUDY_DIRECTORMedical Director
Merck Sharp and Dohme LLC
Outcome results
None listed