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MK-6255

Phase 1

Ovarian Neoplasms | Monoclonal antibody | Other |Merck & Company, Inc.|Trials Updated: Oct 13, 2026

MK-6255 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Oct 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment80

FDA Designations

No designations recorded

MK-6255 clinical trials

MK-6255 · 1 trial · 2 indications

Phase 1 1
NCT07870278A Clinical Trial of MK-6255 to Treat Endometrial and Ovarian Cancer (MK-6255-001)Ovarian Neoplasms
NOT YET_RECRUITING80 Analytics
PHASE1NOT YET_RECRUITING
A Clinical Trial of MK-6255 to Treat Endometrial and Ovarian Cancer (MK-6255-001)
Ovarian NeoplasmsUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants Who Experience a Dose-limiting Toxicity (DLT) as Assessed Using National Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE), Version 6.0
Up to 21 days at each dose level

A DLT is defined as any drug-related AE observed during the DLT evaluation period that meet criteria specified in the protocol. DLTs will be evaluated until 21 days after the first fixed dose during fixed-dose escalation and until 21 days after the first target dose during step-up dose escalation and dose interval extension.

Number of participants who experience one or more adverse events (AEs)
Up to approximately 56 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants that experience AEs will be reported.

Number of participants who discontinue study intervention due to an adverse event (AE)
Up to approximately 56 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants that discontinue study intervention due to an AE will be reported.

Secondary Endpoints

Area Under the Serum Concentration-Time Curve (AUC) of MK-6255
At designated timepoints (up to approximately 2 weeks postdose)
Minimum Serum Concentration (Cmin) of MK-6255
At designated timepoints (up to approximately 2 weeks postdose)
Maximum Serum Concentration (Cmax) of MK-6255
At designated timepoints (up to approximately 2 weeks postdose)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Dose EscalationEXPERIMENTALParticipants receive MK-6255 once every week (QW).
Dose Interval ExtensionEXPERIMENTALParticipants receive MK-6255 at extended interval dosing.

Interventions

NameTypeDescription
MK-6255BIOLOGICALDuring initial dose escalation, participants will receive MK-6255 one weekly (QW). During Dose Interval Extension, participants will receive target doses every 3 weeks (Q3W).
CD8 PET TracerOTHERParticipants may receive an optional CD8 PET tracer for exploratory imaging assessments.
AcetaminophenDRUGParticipants will receive acetaminophen (or similar antipyretic) as premedication.
DiphenhydramineDRUGParticipants will receive diphenhydramine (or similar antihistamine) as premedication.
DexamethasoneDRUGParticipants will receive dexamethasone as premedication.
TocilizumabBIOLOGICALParticipants will receive this rescue medication at the investigator's discretion for treatment of cytokine release syndrome (CRS) after MK-6255 administration.
Tocilizumab biosimilarBIOLOGICALParticipants will receive this rescue medication at the investigator's discretion for treatment of cytokine release syndrome (CRS) after MK-6255 administration.
SiltuximabBIOLOGICALParticipants will receive this rescue medication at the investigator's discretion for treatment of cytokine release syndrome (CRS) after MK-6255 administration.
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Eligibility Criteria

Age Range18 Years to N/A
SexFEMALE
Healthy VolunteersNo

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: * Has one of the following diagnoses: * Recurrent, pathologically documented epithelial OC, primary peritoneal cancer, or fallopian tube cancer that is either (1) platinum resistant or (2) platinum sen...

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Recent Changes (Last 90 Days)

LOWOct 13, 2026NCT07870278NEW_TRIAL: changed
LOWOct 13, 2026NCT07870278NEW_TRIAL: changed