MyelofibrosisPhase 1/2NCT06773195
A Study of Ruxolitinib in Combination With Ulixertinib in People With Myelofibrosis
A Phase 1/2 study testing Ulixertinib and Ruxolitinib in people with Myelofibrosis, run by Memorial Sloan Kettering Cancer Center at 9 sites in United States.
Trial summary
The researchers are doing this study to find out whether the combination of ruxolitinib and ulixertinib is a safe and effective treatment for people with myelofibrosis. The researchers will test different doses of ulixertinib to find the highest dose that causes few or mild side effects in participants when given in… Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Myelofibrosis
- What is being tested?
- Ulixertinib and Ruxolitinib
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 37 participants
- Where
- 9 sitesUnited States
- Study dates
- 7 Jan 2025to Jan 2028
- Phase
- Phase 1/2
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Patients with a diagnosis of primary myelofibrosis, post-ET myelofibrosis, post-PV myelofibrosis, or post-pre-fibrotic myelofibrosis by WHO 2016 criteria.
- Age ≥18 years.
- Receiving ruxolitinib monotherapy for at least 3 months with stable dose (10 mg BID to 20mg BID) for at least 4 weeks before first dose of study drug. Note: stable ruxolitinib dosing should be achieved according to strict adherence to dose modification/reduction guidelines detailed in the ruxolitinib package insert, for patients with renal impairment, and/or hepatic impairment.
- Must have DIPSS+ intermediate 2 or greater risk disease, or MIPSS70+ intermediate or greater risk disease
- Persistent disease despite ruxolitinib monotherapy, as demonstrated by:
- o Grade 2 or 3 reticulin/collagen fibrosis on bone marrow AND
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- Splenomegaly (palpable at least 5cm below subcostal margin/or spleen volume > 450cm^3) OR
- Active symptoms (MPN-SAF TSS score >10 with at least one MPNSAF TSS score >5 or two scores >3)
- ECOG performance status ≤2
- Participants must have adequate organ and marrow function as defined below unless the elevated laboratory values are attributable to Gilbert's Syndrome with Sponsor review and approval:
- Absolute neutrophil count ≥ 0.5 K/mcL
- Platelets ≥ 50 K/mcL
- Direct bilirubin ≤ 1.5 times institutional upper limit of normal (ULN)
- Total bilirubin ≤ 1.5 times institutional upper limit of normal (ULN
- AST(SGOT)/ALT(SGPT) ≤ 3 × institutional ULN
- Creatinine clearance ≥ 50 mL/min as calculated by institutional standard
- Bone marrow and peripheral blood blast count <10%
- Agreeable to the use of adequate contraception to avoid pregnancy (Appendix D). Women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth contro) prior to study entry, for the duration of study participation, and 4 months after completion of drug administration (Appendix D). At least two highly effective methods of contraception, one of which must be a barrier method, are required for males and females of childbearing age during dosing and for 4 months after completing treatment. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 4 months after completion of drug administration
Who cannot join
- Use of experimental drug therapy for MF or any other standard drug with the exception of hydroxyurea or ruxolitinib within 2 weeks of starting combination therapy and/or lack of recovery from all toxicities from previous therapy (except ruxolitinib) to Grade 1 or better. Hydroxyurea may be utilized to control leukocytosis for up to 4 weeks during study
- Participants with a prior or concurrent malignancy whose natural history or treatment has the potential to interfere with the safety or efficacy assessment of the investigational regimen
- Unwilling to receive red blood cell transfusion to treat low hemoglobin.
- Participants who are receiving any other investigational agents.
- History of allergic reactions attributed to compounds of similar chemical or biologic composition to ruxolitinib and ulixertinib.
- Participants requiring any medications or substances that are strong inhibitors or inducers of 3A4, strong inhibitors of CYP1A2 and CYP2D6, and inhibitors of Pglycoprotein (P-gp). Strong inhibitors or inducers of 3A4, strong inhibitors of CYP1A2 and CYP2D6, and inhibitors of P-gp must be stopped within 14 days (or 5 half-lives) of study commencement. Because the lists of these agents are constantly changing, it is important to regularly consult a frequently-updated medical reference. As part of the enrollment/informed consent procedures, the participant will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the participant is considering a new over-the-counter medicine or herbal product.
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- Participants who are pregnant or breastfeeding.
- Pregnant women are excluded from this study because ruxolitinib and ulixertinib are agents with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with ruxolitinib and ulixertinib, breastfeeding should be discontinued if the mother is treated with ruxolitinib and ulixertinib.
- Active bacterial, fungal, or viral infection requiring treatment.
- Participants with chronic Human immunodeficiency virus (HIV) or hepatitis B or C viral infection.
- HIV-infected participants on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial. Note: testing does not have to be performed during screening unless participant has known or suspected history of HIV.
- For participants with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated.
- Presence of active interstitial lung disease or pneumonitis.
- History of cardiovascular risk factors:
- Clinically significant, uncontrolled arrythmias and/or conduction abnormalities. Participants with controlled atrial fibrillation >30 days prior to study initiation are eligible.
- QTc > 480 msec using Fredericia formula.
- History of acute coronary syndromes (including myocardial infarction and unstable angina), coronary angioplasty, or stenting within 6 months prior to study entry;
- Class II congestive heart failure or greater or ejection fraction ≤50% on baseline echocardiogram.
- History of uncontrolled hypertension.
- A history or current evidence/risk of retinal vein occlusion (RVO) or central serous retinopathy (CSR).
- Psychiatric illness/social situations, active drug, alcohol or substance use that would interfere with study compliance.
- Any condition that would, in the investigator's judgment, interfere with full participation in the study, including administration of study drug and attending study visits; pose a significant risk to the participant; or interfere with interpreting study data.
- Participants eligible for allogeneic stem cell transplantation in the opinion of the treating physician at the time of enrollment.
- Inability to comprehend or unwilling to sign the informed consent form.
- Transformation to accelerated or blast phase disease, including myeloid sarcoma.
Trial locations and contacts
9 sites in 1 country. Contact the study team or a site near you to ask about taking part.
Prioty Islam, MD, MS contact
9 sites in 1 country
United States9 sites, 9 recruiting
- Recruiting
Memorial Sloan Kettering Basking Ridge (Limited Protocol Activities)
Basking Ridge, New Jersey, 07920
Raajit Rampal, MD,PhD, 646-608-3746
- Recruiting
Massachusetts General Hospital (Data Collection Only)
Boston, Massachusetts, 02114
Gabriella Hobbs, MD, 866-493-1612
- Not yet recruiting
Cleveland Clinic
Cleveland, Ohio, 44195
Aaron Gerds, MD, 216-444-6833
- Recruiting
Memorial Sloan Kettering Suffolk - Commack (Limited Protocol Activities)
Commack, New York, 11725
Raajit Rampa, MD, PhD, 646-608-3746
- Recruiting
Memorial Sloan Kettering Westchester (Limited Protocol Activities)
Harrison, New York, 10604
Raajit Rampal, MD, PhD, 646-608-3746
- Recruiting
Memorial Sloan Kettering Monmouth (Limited Protocol Activities)
Middletown, New Jersey, 07748
Raajit Rampal, MD, PhD, 646-608-3746
- Recruiting
Memorial Sloan Kettering Bergen (Limited Protocol Activities)
Montvale, New Jersey, 07645
Raajit Rampal, MD, PhD, 646-608-3746
- Recruiting
Memorial Sloan Kettering Cancer Center
New York, New York, 10065
Raajit Rampal, MD, PhD, 646-608-3746
- Recruiting
Memorial Sloan Kettering Nassau (Limited Protocol Activities)
Uniondale, New York, 11553
Raajit Rampal, MD, PhD, 646-608-3746
About this study
Official title: A Phase 1/2 Study of Combined JAK/ERK Inhibition in Patients With Myelofibrosis
The researchers are doing this study to find out whether the combination of ruxolitinib and ulixertinib is a safe and effective treatment for people with myelofibrosis. The researchers will test different doses of ulixertinib to find the highest dose that causes few or mild side effects in participants when given in combination with ruxolitinib.
- Conditions
- Myelofibrosis
- Being tested
- Ulixertinib, Ruxolitinib
- Keywords
- post-ET myelofibrosis, post-PV myelofibrosis,, post-pre-fibrotic myelofibrosis, JAK/MEK inhibition, Ruxolitinib, Ulixertinib
- Medical subject headings
- Primary Myelofibrosis
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
UlixertinibDrug
There are 3 planned dose levels of ulixertinib(450 mg BID, 300 mg BID, or 150 mg BID)
RuxolitinibDrug
Ruxolitinib for 28 day cycles.
| Study group | Role | What they receive |
|---|---|---|
| JAK/MEK inhibition with Ruxolitinib and Ulixertinib | Experimental | Phase 1: There are 3 planned dose levels of ulixertinib (450 mg BID, 300 mg BID, or 150 mg BID) in combination with ruxolitinib for 28 day cycles. A 3+3 dose escalation design will be used to determine the RP2D of ulixertinib with ruxolitinib. Phase 2: Participants will be treated with ulixertinib at the RP2D determined from the phase 1 part of the study in combination with ruxolitinib for 28 day cycles. Receives: Drug: Ulixertinib; Drug: Ruxolitinib |
What is being measured
The primary outcome is the main question the study is designed to answer.
Dose Limiting Toxicity evaluable participants
If none of the initial 3 patients in a cohort experience a dose limiting toxicity (DLT), then the next dose level will be studied in another cohort of 3 patients. If 1 of the initial 3 patients at a given dose level experience a DLT, up to 3 additional patients will be treated at that same dose level. Escalation will continue if not more than 1 of the 6 patients experience a DLT.
Measured: up to 28 days
Response to therapy
as defined by International Working Group-Myeloproliferative Neoplasms Research and Treatment (IWG-MRT working criteria)
Measured: at week 25
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted14 Jan 2025
- Study start7 Jan 2025
- Primary completionJan 2028 (estimated)
- Study completionJan 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for MyelofibrosisStudies of the same condition, open and under way.
- More trials run by Memorial Sloan Kettering Cancer CenterThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1/2
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 37 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Memorial Sloan Kettering Cancer Center
- Sponsor type
- University, hospital or other
- Collaborators
- BioMed Valley Discoveries, Inc, Incyte Corporation
- Responsible party
- Sponsor
- Investigators
- Raajit Rampal, MD, PhD, Principal investigator, Memorial Sloan Kettering Cancer Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06773195
- Sponsor's protocol ID
- 24-157
- Status last verified
- Jul 2026
- First submitted
- 8 Jan 2025
- Last updated
- 28 Jul 2026
- Results posted
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Yes: Memorial Sloan Kettering Cancer Center supports the international committee of medical journal editors (ICMJE) and the ethical obligation of responsible sharing of data from clinical trials. The protocol summary, a statistical summary, and informed consent form will be made available on clinicaltrials.gov when required as a condition of Federal awards, other agreements supporting the research and/or as otherwise required. Requests for deidentified individual participant data can be made beginning 12 months after publication and for up to 36 months post publication. Deidentified individual participant data reported in the manuscript will be shared under the terms of a Data Use Agreement and may only be used for approved proposals. Requests may be made to: crdatashare@mskcc.org
Study at a glance
From the registry record, last updated by the sponsor on 28 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 1/2 Study of Combined JAK/ERK Inhibition in Patients With Myelofibrosis
- ClinicalTrials.gov ID
- NCT06773195
- Acronym / sponsor ID
- 24-157
- Conditions
- Myelofibrosis
- Keywords
- post-ET myelofibrosis, post-PV myelofibrosis,, post-pre-fibrotic myelofibrosis, JAK/MEK inhibition, Ruxolitinib, Ulixertinib
- Phase
- Phase 1/2
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 37 participants (estimated)
- Lead sponsor
- Memorial Sloan Kettering Cancer CenterUniversity, hospital or other
- Collaborators
- BioMed Valley Discoveries, Inc, Incyte Corporation
- Study start
- 7 Jan 2025 (actual)
- Primary completion
- Jan 2028 (estimated)
- Study completion
- Jan 2028 (estimated)
- First posted
- 14 Jan 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The researchers are doing this study to find out whether the combination of ruxolitinib and ulixertinib is a safe and effective treatment for people with myelofibrosis. The researchers will test different doses of ulixertinib to find the highest dose that causes few or mild side effects in participants when given in combination with ruxolitinib.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| JAK/MEK inhibition with Ruxolitinib and Ulixertinib | Experimental | Drug: Ulixertinib, Drug: RuxolitinibPhase 1: There are 3 planned dose levels of ulixertinib (450 mg BID, 300 mg BID, or 150 mg BID) in combination with ruxolitinib for 28 day cycles. A 3+3 dose escalation design will be used to determine the RP2D of ulixertinib with ruxolitinib. Phase 2: Participants will be treated with ulixertinib at the RP2D determined from the phase 1 part of the study in combination with ruxolitinib for 28 day cycles. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (18 listed)
- Patients with a diagnosis of primary myelofibrosis, post-ET myelofibrosis, post-PV myelofibrosis, or post-pre-fibrotic myelofibrosis by WHO 2016 criteria.
- Age ≥18 years.
- Receiving ruxolitinib monotherapy for at least 3 months with stable dose (10 mg BID to 20mg BID) for at least 4 weeks before first dose of study drug. Note: stable ruxolitinib dosing should be achieved according to strict adherence to dose modification/reduction guidelines detailed in the ruxolitinib package insert, for patients with renal impairment, and/or hepatic impairment.
- Must have DIPSS+ intermediate 2 or greater risk disease, or MIPSS70+ intermediate or greater risk disease
- Persistent disease despite ruxolitinib monotherapy, as demonstrated by:
Key exclusion criteria (25 listed)
- Use of experimental drug therapy for MF or any other standard drug with the exception of hydroxyurea or ruxolitinib within 2 weeks of starting combination therapy and/or lack of recovery from all toxicities from previous therapy (except ruxolitinib) to Grade 1 or better. Hydroxyurea may be utilized to control leukocytosis for up to 4 weeks during study
- Participants with a prior or concurrent malignancy whose natural history or treatment has the potential to interfere with the safety or efficacy assessment of the investigational regimen
- Unwilling to receive red blood cell transfusion to treat low hemoglobin.
- Participants who are receiving any other investigational agents.
- History of allergic reactions attributed to compounds of similar chemical or biologic composition to ruxolitinib and ulixertinib.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| UlixertinibThere are 3 planned dose levels of ulixertinib(450 mg BID, 300 mg BID, or 150 mg BID) | Drug | JAK/MEK inhibition with Ruxolitinib and Ulixertinib |
| RuxolitinibRuxolitinib for 28 day cycles. | Drug | JAK/MEK inhibition with Ruxolitinib and Ulixertinib |
Primary outcome
Dose Limiting Toxicity evaluable participants
Time frame: up to 28 days
If none of the initial 3 patients in a cohort experience a dose limiting toxicity (DLT), then the next dose level will be studied in another cohort of 3 patients. If 1 of the initial 3 patients at a given dose level experience a DLT, up to 3 additional patients will be treated at that same dose level. Escalation will continue if not more than 1 of the 6 patients experience a DLT.
Response to therapy
Time frame: at week 25
as defined by International Working Group-Myeloproliferative Neoplasms Research and Treatment (IWG-MRT working criteria)
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 28 Jul 2026.
- Memorial Sloan Kettering Cancer CenterLink provided by the sponsor.
- Individual participant dataSharing planned: Yes. Memorial Sloan Kettering Cancer Center supports the international committee of medical journal editors (ICMJE) and the ethical obligation of responsible sharing of data from clinical trials. The protocol summary, a statistical summary, and informed consent form will be made available on clinicaltrials.gov when required as a condition of Federal awards, other agreements supporting the research and/or as otherwise required. Requests for deidentified individual participant data can be made beginning 12 months after publication and for up to 36 months post publication. Deidentified individual participant data reported in the manuscript will be shared under the terms of a Data Use Agreement and may only be used for approved proposals. Requests may be made to: crdatashare@mskcc.org
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A Study to Compare Elritercept to Placebo in Adults With Myelofibrosis and Anemia Who Are Taking Ruxolitinib
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Motor Development and Early Predictors of Psychomotor Outcomes in Preterm and Term Infants Assessed by MOS-R and Caregiver Questionnaire at 18 and 36 Months
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Study of Selinexor in Combination With Ruxolitinib in Myelofibrosis
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Study of Momelotinib in Combination With Luspatercept in Participants With Transfusion Dependent Myelofibrosis
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Prioty Islam, MD, MS contact
Raajit Rampal, MD, PhD principal investigator
Memorial Sloan Kettering Cancer Center
9 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 1/2 study testing Ulixertinib and Ruxolitinib in people with Myelofibrosis, run by Memorial Sloan Kettering Cancer Center at 9 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 18 inclusion and 25 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 28 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 9 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this combined phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Raajit Rampal, MD, PhD (646-608-3746, rampalr@mskcc.org), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Dose Limiting Toxicity evaluable participants (time frame: up to 28 days). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Jul 2026.