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M3554

Phase 1

Advanced Solid Tumor | Small molecule | Oncology |Merck KGaA|Trials Updated: Oct 7, 2026

M3554 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Oct 2024

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment65

FDA Designations

No designations recorded

M3554 clinical trials

M3554 · 1 trial · 1 indication

Phase 1 1
NCT06641908Anti-GD2 ADC M3554 in Advanced Solid TumorsAdvanced Solid Tumor
RECRUITING65 Analytics
PHASE1RECRUITING
Anti-GD2 ADC M3554 in Advanced Solid Tumors
Advanced Solid TumorUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants with Dose Limiting Toxicities (DLTs) and Adverse Events (AEs)
up to 4 months

Secondary Endpoints

Pharmacokinetic (PK) Plasma Concentrations of M3554
Cycle 1 Day 1 to Cycle 3 Day 15 and every second cycle from Cycle 4 (each cycle is of 21 days), assessed up to approximately 4 months
Objective Response (OR) According to Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 or Response Assessment in Neuro-oncology (RANO) 2.0 as Assessed by Investigator
Time from randomization to planned assessment at 4 months
Duration of Response (DoR) According to RECIST Version 1.1 or RANO 2.0 as Assessed by Investigator
Time from randomization to planned assessment at 4 months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Dose Escalation: M3554 MonotherapyEXPERIMENTAL -

Interventions

NameTypeDescription
M3554DRUGM3554 will be administered at an escalated dose until Maximum tolerated dose (MTD) and/or a safe recommended Dose is determined in participants with STS (dose escalation A) and glioblastoma and IDH wildtype (dose escalation B).
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites11

Inclusion Criteria: * Escalation A: participants with documented histopathological diagnosis of locally advanced or metastatic STS with unresectable disease that has progressed after at least one prior line of anthracycline-containing systemic therapy for the locally advanced/metastatic setting. * ...

Countries:United StatesBelgiumFranceJapanSwitzerlandUnited Kingdom
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Competitive Landscape -Other Solid Tumors 10 trials (matched to "Advanced Solid Tumor")

Recent Changes (Last 90 Days)

LOWOct 7, 2026NCT06641908lastUpdatePostDate: changed
LOWOct 7, 2026NCT06641908lastUpdatePostDate: changed
LOWSep 22, 2026NCT06641908Enrollment: 52 → 65
LOWSep 22, 2026NCT06641908Enrollment: 52 → 65
LOWSep 8, 2026NCT06641908lastUpdatePostDate: changed
LOWSep 8, 2026NCT06641908lastUpdatePostDate: changed
LOWAug 12, 2026NCT06641908lastUpdatePostDate: changed
LOWAug 12, 2026NCT06641908lastUpdatePostDate: changed

Frequently asked questions about M3554

What is M3554?

M3554 is an investigational small molecule developed by Merck KGaA for the treatment of advanced solid tumors. It is being studied as an anti-GD2 antibody-drug conjugate and is currently in Phase 1 clinical development. M3554 has not been approved by any regulatory authority and remains an experimental therapy in oncology.

What is M3554 used for in advanced solid tumors?

M3554 is being evaluated for the treatment of advanced solid tumors in adults aged 18 years and older. The Phase 1 study enrolls patients with advanced solid tumors regardless of biomarker selection. It is an investigational agent, so it is not yet available as a treatment outside of clinical trials.

Who makes M3554?

M3554 is developed by Merck KGaA, the German pharmaceutical and life sciences company whose shares trade over the counter in the United States under the ticker MKGAF. Merck KGaA is the sponsor of the ongoing Phase 1 clinical trial evaluating M3554 in advanced solid tumors.

What phase is M3554 in?

M3554 is in Phase 1 clinical development. One Phase 1 trial is currently recruiting participants, and no Phase 2 or Phase 3 studies have been initiated. The drug is investigational and has not received FDA approval or authorization from any other regulatory agency.

What clinical trials is M3554 in?

M3554 is being studied in the Phase 1 trial NCT06641908, titled Anti-GD2 ADC M3554 in Advanced Solid Tumors. The trial is recruiting and plans to enroll 65 participants across the United States, Belgium, France, Japan, Switzerland, and the United Kingdom. It is an open-label, uncontrolled study in adults with advanced solid tumors.