Brief Summary
This clinical trial is evaluating whether addition of navtemadlin to ruxolitinib treatment will provide more clinical benefit than ruxolitinib alone for patients with Myelofibrosis who have a suboptimal response to ruxolitinib treatment alone.
Subjects will start by receiving ruxolitinib alone in the run-in period. Those who demostrate a suboptimal response from ruxolitinib alone will then be randomized 2:1 to receive navtemadlin or navtemadlin placebo as add-on treatment to their ongoing ruxolitinib. Randomized means that subjects will be assigned to a group by chance, like a flip of a coin. The study is blinded, meaning the subjects, doctors, central endpoint assessors and sponsor will not know which add on treatment (navtemadlin or navtemadlin placebo) the subject is receiving.
Subjects will start by receiving ruxolitinib alone in the run-in period. Those who demostrate a suboptimal response from ruxolitinib alone will then be randomized 2:1 to receive navtemadlin or navtemadlin placebo as add-on treatment to their ongoing ruxolitinib. Randomized means that subjects will be assigned to a group by chance, like a flip of a coin. The study is blinded, meaning the subjects, doctors, central endpoint assessors and sponsor will not know which add on treatment (navtemadlin or navtemadlin placebo) the subject is receiving.
Brief Title
Study of Navtemadlin Add-on to Ruxolitinib in JAK Inhibitor-Naïve Patients with Myelofibrosis Who Have a Suboptimal Response to Ruxolitinib
Categories
Central Contacts
Central Contact Role
Contact
Central Contact Phone
650-542-0136
Central Contact Email
jmei@kartosthera.com
Completion Date
Completion Date Type
Estimated
Conditions
Myelofibrosis
Post-PV MF
Post-ET Myelofibrosis
Primary Myelofibrosis
MF
Eligibility Criteria
Inclusion Criteria for Ruxolitinib Alone Period:
* Confirmed diagnosis of PMF, post-PV MF, or post-ET MF, as assessed by the treating physician according to the World Health Organization (WHO) criteria
* High, Intermediate-1, Intermediate-2 risk category International Prognosis System Score (IPSS)
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2
* JAK-inhibitor treatment naive
Exclusion Criteria for Ruxolitinib Alone Period:
* Prior Splenectomy
* Splenic irradiation within 3 months prior to the first dose
* Prior BCL-XL, BET, MDM2, PI3K, PIM, or XPO1 inhibitors therapy or p53-directed therapy
* Eligible for Bone Marrow Transplant
* Peripheral blood or bone marrow blast count ≥ 10 percent
Inclusion Criteria for Randomized Period:
* PMF, post-PV MF, or post-ET MF that is TP53WT as assessed by central testing
* ECOG performance status of 0 to 2
* Treatment with a stable dose of ruxolitinib
* Suboptimal response to run-in ruxolitinib treatment
Exclusion Criteria for Randomized Period:
* Elevated white blood cell count that doubles (or more) during ruxolitinib treatment and exceeds 50 × 10\^9/L
* Peripheral blood or bone marrow blast count ≥ 10 percent
* Confirmed diagnosis of PMF, post-PV MF, or post-ET MF, as assessed by the treating physician according to the World Health Organization (WHO) criteria
* High, Intermediate-1, Intermediate-2 risk category International Prognosis System Score (IPSS)
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2
* JAK-inhibitor treatment naive
Exclusion Criteria for Ruxolitinib Alone Period:
* Prior Splenectomy
* Splenic irradiation within 3 months prior to the first dose
* Prior BCL-XL, BET, MDM2, PI3K, PIM, or XPO1 inhibitors therapy or p53-directed therapy
* Eligible for Bone Marrow Transplant
* Peripheral blood or bone marrow blast count ≥ 10 percent
Inclusion Criteria for Randomized Period:
* PMF, post-PV MF, or post-ET MF that is TP53WT as assessed by central testing
* ECOG performance status of 0 to 2
* Treatment with a stable dose of ruxolitinib
* Suboptimal response to run-in ruxolitinib treatment
Exclusion Criteria for Randomized Period:
* Elevated white blood cell count that doubles (or more) during ruxolitinib treatment and exceeds 50 × 10\^9/L
* Peripheral blood or bone marrow blast count ≥ 10 percent
Inclusion Criteria
Inclusion Criteria for Ruxolitinib Alone Period:
* Confirmed diagnosis of PMF, post-PV MF, or post-ET MF, as assessed by the treating physician according to the World Health Organization (WHO) criteria
* High, Intermediate-1, Intermediate-2 risk category International Prognosis System Score (IPSS)
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2
* JAK-inhibitor treatment naive
Inclusion Criteria for Randomized Period:
* PMF, post-PV MF, or post-ET MF that is TP53WT as assessed by central testing
* ECOG performance status of 0 to 2
* Treatment with a stable dose of ruxolitinib
* Suboptimal response to run-in ruxolitinib treatment
* Confirmed diagnosis of PMF, post-PV MF, or post-ET MF, as assessed by the treating physician according to the World Health Organization (WHO) criteria
* High, Intermediate-1, Intermediate-2 risk category International Prognosis System Score (IPSS)
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2
* JAK-inhibitor treatment naive
Inclusion Criteria for Randomized Period:
* PMF, post-PV MF, or post-ET MF that is TP53WT as assessed by central testing
* ECOG performance status of 0 to 2
* Treatment with a stable dose of ruxolitinib
* Suboptimal response to run-in ruxolitinib treatment
Gender
All
Gender Based
false
Keywords
Navtemadlin
KRT-232
Ruxolitinib
POIESIS
TP53
Suboptimal response
Sub-optimal response
Healthy Volunteers
No
Last Update Post Date
Last Update Post Date Type
Actual
Last Update Submit Date
Minimum Age
18 Years
NCT Id
NCT06479135
Org Class
Industry
Org Full Name
Kartos Therapeutics, Inc.
Org Study Id
KRT-232-115
Overall Status
Recruiting
Phases
Phase 3
Primary Completion Date
Primary Completion Date Type
Estimated
Official Title
A Phase 3, Randomized, Double-blind, Add-on Study Evaluating the Safety and Efficacy of Navtemadlin Plus Ruxolitinib Vs Placebo Plus Ruxolitinib in JAK Inhibitor-Naïve Patients with Myelofibrosis Who Have a Suboptimal Response to Ruxolitinib
Primary Outcomes
Outcome Description
The proportion of subjects in each arm with SVR35 by MRI/CT scan (central review) 24 weeks after start of the randomized period
Outcome Measure
To compare spleen volume reduction (SVR35) between Arm 1 and Arm 2
Outcome Time Frame
24 weeks
Outcome Description
The proportion of subjects in each arm with a TSS50 by the Myelofibrosis Symptom Assessment Form (MFSAF) v4.0 24 weeks after start of the randomized period
Outcome Measure
To compare total symptom score reduction (TSS50) between Arm 1 and Arm 2
Outcome Time Frame
24 weeks
Secondary Outcomes
Outcome Description
Time to progression or death from any cause in subjects randomized to each arm
Outcome Time Frame
Up to 8 years
Outcome Measure
To compare time to progression between Arm 1 and Arm 2
Outcome Description
Time to death from any cause in subjects randomized to each arm
Outcome Time Frame
Up to 8 years
Outcome Measure
To compare overall survival (OS) between Arm 1 and Arm 2
Start Date
Start Date Type
Actual
Status Verified Date
First Post Date
First Post Date Type
Actual
First Submit Date
First Submit QC Date
Std Ages
Adult
Older Adult
Maximum Age Number (converted to Years and rounded down)
999
Minimum Age Number (converted to Years and rounded down)
18
Investigators
Investigator Type
Principal Investigator
Investigator Name
Swati Goel
Investigator Email
swgoel@montefiore.org
Investigator Phone
718-920-6310 / 718-920-4137