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MMB

Phase 2

Neoplasms | Small molecule | Oncology |GSK plc|Last Updated: Jun 18, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment237

FDA Designations

No designations recorded

Clinical trial landscape

MMB · 2 trials · 7 indications

Phase 2 2
NCT03441113Extended Access of Momelotinib in Adults With MyelofibrosisNeoplasms
ACTIVE NOT_RECRUITING237 Analytics
NCT02515630Momelotinib in Transfusion-Dependent Adults With Primary Myelofibrosis (PMF) or Post-polycythemia Vera or Post-essential Thrombocythemia Myelofibrosis (Post-PV/ET MF)Primary Myelofibrosis (PMF)
COMPLETED41 Analytics
PHASE2ACTIVE NOT_RECRUITING
Extended Access of Momelotinib in Adults With Myelofibrosis
NeoplasmsUnlock trial analytics
PHASE2COMPLETED
Momelotinib in Transfusion-Dependent Adults With Primary Myelofibrosis (PMF) or Post-polycythemia Vera or Post-essential Thrombocythemia Myelofibrosis (Post-PV/ET MF)
Primary Myelofibrosis (PMF)Unlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants Who Had Access to, and Received the Intervention
Participants will be assessed every 12 weeks until discontinuation. Participation in this extended access study has been an average of approximately 8 months.
Transfusion Independence Response by Week 24
From baseline to Week 24

The percentage of subjects who became transfusion independent for ≥ 12 weeks at any time on study. A subject was considered transfusion independent on study if no RBC transfusion occurred in any 12-week period during the 24-week treatment period.

Secondary Endpoints

Transfusion Response Rate by Week 24
From baseline to Week 24
Splenic Response Rate at Week 24
Measured at Week 24
Response Rate in Total Symptom Score (TSS) at Week 24
Measured at Week 24
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: Study GS-US-352-0101OTHERParticipants will continue to receive the same dosage regimen as in the previous MMB study GS-US-352-0101 until MMB receives regulatory approval and is commercially available, or development of the product ceases.
Cohort 2: Study GS-US-352-1214OTHERParticipants will continue to receive the same dosage regimen as in the previous MMB study GS-US-352-1214 until MMB receives regulatory approval and is commercially available, or development of the product ceases.
Cohort 3: Study GS-US-352-1154OTHERParticipants will continue to receive the same dosage regimen as in the previous MMB study GS-US-352-1154 until MMB receives regulatory approval and is commercially available, or development of the product ceases..
Cohort 4: Study SRA-MMB-301OTHERParticipants will continue to receive the same dosage regimen as in the previous MMB study SRA-MMB-301 until MMB receives regulatory approval and is commercially available, or development of the product ceases.
MomelotinibEXPERIMENTALMMB for 24 weeks (± 7 days)

Interventions

NameTypeDescription
MMBDRUGTablet(s) administered orally once daily
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites112

Key Inclusion Criteria: * Currently enrolled in Studies GS-US-352-0101, GS-US-352-1214, GS-US-352-1154, or SRA-MMB-301 * Able to comprehend and willing to sign the informed consent form Key Exclusion Criteria: * Known hypersensitivity to MMB, its metabolites, or formulation excipients NOTE: Othe...

Countries:United StatesAustraliaAustriaBelgiumBulgariaCanadaDenmarkFranceGermanyHungaryIsraelItalyNetherlandsPolandRomaniaSingaporeSouth KoreaSpainTaiwanUnited Kingdom
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Recent Changes (Last 90 Days)

LOWJun 18, 2026NCT03441113lastUpdatePostDate: changed
LOWJun 18, 2026NCT03441113lastUpdatePostDate: changed
LOWJun 18, 2026NCT03441113lastUpdatePostDate: changed

Frequently asked questions about MMB

What is MMB used for?

MMB is an investigational small molecule being developed for Primary Myelofibrosis (PMF) and related myeloproliferative neoplasms, including post-polycythemia vera and post-essential thrombocythemia myelofibrosis. It is studied in transfusion-dependent adults with these conditions. MMB is currently in Phase 2 clinical development and is not approved by regulatory authorities.

Who makes MMB?

MMB is being developed by GSK plc, a global biopharmaceutical company listed on the stock exchange under the ticker GSK. GSK is conducting clinical trials to evaluate MMB in patients with myelofibrosis and related neoplasms.

What phase is MMB in?

MMB is in Phase 2 clinical development. Two Phase 2 trials have been conducted: one completed study and one active but not recruiting extended access study. MMB is an investigational agent and has not received regulatory approval for any indication.

What clinical trials is MMB in?

MMB has been studied in two clinical trials. NCT02515630 is a completed Phase 2 study in transfusion-dependent adults with primary myelofibrosis or post-PV/ET myelofibrosis. NCT03441113 is an active extended access study enrolling 237 adults with myelofibrosis and related neoplasms across multiple countries.

Is MMB the same as momelotinib?

Yes, MMB is also known as momelotinib. Clinical trial records refer to the drug as momelotinib, and MMB is used as a shorthand identifier. Both names refer to the same investigational small molecule being developed by GSK for myelofibrosis.