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M1774

Phase 1

Metastatic or Locally Advanced Unresectable Solid Tumors | Small molecule | Oncology |Merck & Company, Inc.|Last Updated: Aug 13, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment161

FDA Designations

No designations recorded

Clinical trial landscape

M1774 · 1 trial · 1 indication

Phase 1 1
NCT04170153Tuvusertib (M1774) in Participants With Metastatic or Locally Advanced Unresectable Solid Tumors (DDRiver Solid Tumors 301)Metastatic or Locally Advanced Unresectable Solid Tumors
ACTIVE NOT_RECRUITING161 Analytics
PHASE1ACTIVE NOT_RECRUITING
Tuvusertib (M1774) in Participants With Metastatic or Locally Advanced Unresectable Solid Tumors (DDRiver Solid Tumors 301)
Metastatic or Locally Advanced Unresectable Solid TumorsUnlock trial analytics

Study Endpoints

Primary Endpoints

Part A1, A4 and A5: Occurrence of Dose-Limiting Toxicities (DLTs) During the DLT Observation Period
Day 1 to Day 21 of Cycle 1 (Each Cycle is of 21 days)
Part A1, A3, A4, A5 and B1: Occurrence of Treatment-emergent Adverse Events (TEAEs), Treatment-related Adverse Events (AEs) and Death According to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) Version 5.0
Baseline up to 30 days after the last dose of study treatment, assessed up to approximately 2.2 years
Part A1, A3, A4, A5 and B1: Number of Participants With Grade 3 or Higher Laboratory Findings According to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) Version 5.0
Baseline up to 30 days after the last dose of study treatment, assessed up to approximately 2.2 years
Part A1, A3, A4, A5 and B1: Number of Participants With Abnormalities in Vital Signs
Baseline up to 30 days after the last dose of study treatment, assessed up to approximately 2.2 years
Part A1, A3, A4, A5 and B1: Number of Participants With Clinical Significant Abnormalities in Electrocardiogram (ECG) Findings
Baseline up to 30 days after the last dose of study treatment, assessed up to approximately 2.2 years
Part A2: Area Under the Plasma Concentration Curve From Time Zero to 24 Hours Post Dose (AUC 0-24h) of Tuvusertib (M1774)
Cycle 1 Day -7 and Day 1: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A2: Area Under the Plasma Concentration Curve From Time Zero to Infinity Post Dose (AUC 0-inf) of Tuvusertib (M1774)
Cycle 1 Day -7 and Day 1: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A2: Maximum Observed Plasma Concentration (Cmax) of Tuvusertib (M1774)
Cycle 1 Day -7 and Day 1: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A2: Relative Bioavailability Based on Area Under the Plasma Concentration Curve (Frel[AUC]) of Tuvusertib (M1774) Under Fed Condition as Compared to Fasting Condition
Cycle 1 Day -7 and Day 1: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A2: Relative Bioavailability Based on Maximum Observed Plasma Concentration (Frel[Cmax]) of Tuvusertib (M1774) Under Fed Condition as Compared to Fasting Condition
Cycle 1 Day -7 and Day 1: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A3: Objective Response as Assessed by Investigator According to Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1
Baseline up to 2.2 years
Part B1: Occurrence of Dose-Limiting Toxicities (DLTs) During the DLT Observation Period
Day 1 to Day 28 of Cycle 1 (Each Cycle is of 28 days)
Part A1, A4, A5 and B1: To Determine the Recommended Dose Expansion (RDE) for Tuvusertib (M1774) monotherapy globally, in Japanese and in Chinese participants With Metastatic or Locally Advanced Unresectable Solid Tumors and in combination with Niraparib
Assessed up to approximately 2.2 years

Secondary Endpoints

Part A1, A3, A4 and A5: Maximum Observed Plasma Concentration (Cmax) of Tuvusertib (M1774)
Cycle 1 Day 1 and Day 8: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A1, A3, A4 and A5: Time to Reach Maximum Plasma Concentration (tmax) of Tuvusertib (M1774)
Cycle 1 Day 1 and Day 8: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
Part A1, A3, A4 and A5: Area Under the Plasma Concentration Curve From Time Zero to 24 Hours Post Dose (AUC0-24h) of Tuvusertib (M1774)
Cycle 1 Day 1 and Day 8: Pre-dose up to 24 hours post-dose (Each Cycle is of 21 days)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A1: Monotherapy Dose EscalationEXPERIMENTALParticipants will initially receive Tuvusertib (M1774) once daily under fasting conditions. Additional schedules may be evaluated if needed.
Part A2 - Preliminary Food Effect AssessmentEXPERIMENTALParticipants in the food effect assessment will receive Tuvusertib (M1774) at the dose and schedule determined as recommended dose for expansion (RDE) in Part A1. A single dose of Tuvusertib (M1774) will be administered on Day -7 under a fed (low-fat meal) or fasted condition, followed by a 1-week washout period. After completion of the scheduled food effect assessments, participants will follow the same schedule as participants in Part A1.
Part A3 - Monotherapy ExpansionEXPERIMENTALPart A3 is an expansion of Part A1 where Tuvusertib (M1774) will be administered as a single agent at the RDE established in Part A1. Participants with defined loss-of-function mutation in ARID1A, ATRX and/or DAXX, and ATM will be enrolled.
Part B1: Combination Therapy Dose FindingEXPERIMENTALB1a: Participants with baseline body weight less than (\<) 77 kilogram (kg) or platelets \<150,000 cubic per millimeter (mm\^3) will receive Niraparib once daily combined with different doses of Tuvusertib (M1774). B1b: Participants with baseline body weight greater than or equal to (\>=) 77 kg and or platelets \>= 150,000 mm\^3 will receive Niraparib once daily combined with different doses of Tuvusertib (M1774) and schedule determined as recommended dose for expansion (RDE) in Part B1a.
Part A4: Japan Dose Confirmation MonotherapyEXPERIMENTALStarting at global RDE from Part A1, in Japan. Participants will initially receive Tuvusertib (M1774) once daily under fasting conditions. Additional schedules may be evaluated if needed.
Part A5: China Dose Confirmation MonotherapyEXPERIMENTALStarting at global RDE from Part A1, in China. Participants will initially receive Tuvusertib (M1774) once daily under fasting conditions. Additional schedules may be evaluated if needed.

Interventions

NameTypeDescription
M1774DRUGM1774 will be administered orally throughout the study.
NiraparibDRUGNiraparib will be administered orally throughout the study.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites16

Inclusion Criteria: * Participants with locally advanced or metastatic disease that is refractory to standard therapy or for which no standard therapy is judged appropriate by the Investigator which may convey clinical benefit * Eastern Cooperative Oncology Group (ECOG) Performance Status less than...

Countries:United StatesChinaJapanSpainUnited Kingdom
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Recent Changes (Last 90 Days)

MEDIUMAug 14, 2026NCT04170153primaryCompletionDate: changed
MEDIUMAug 14, 2026NCT04170153primaryCompletionDate: changed
MEDIUMAug 14, 2026NCT04170153primaryCompletionDate: changed

Frequently asked questions about M1774

What is M1774 used for?

M1774, also known as tuvusertib, is an investigational small molecule being studied for the treatment of metastatic or locally advanced unresectable solid tumors. It is currently in Phase 1 clinical development for this oncology indication.

What does M1774 target?

M1774 is a small molecule being developed for oncology. Its specific molecular target has not been disclosed in available information, so its mechanism of action is not detailed here.

Who makes M1774?

M1774 is being developed by Merck & Company, Inc., a pharmaceutical company traded on the New York Stock Exchange under the ticker symbol MRK. The drug is currently in Phase 1 clinical trials.

What phase is M1774 in?

M1774 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. It is being studied in patients with metastatic or locally advanced unresectable solid tumors.

What clinical trials is M1774 in?

M1774 is being studied in a Phase 1 clinical trial with the identifier NCT04170153, titled "Tuvusertib (M1774) in Participants With Metastatic or Locally Advanced Unresectable Solid Tumors (DDRiver Solid Tumors 301)." The trial is active but not recruiting, with an enrollment of 161 participants.

Is M1774 the same as tuvusertib?

Yes, M1774 is also known as tuvusertib. The clinical trial NCT04170153 refers to the drug as tuvusertib (M1774), confirming that these names refer to the same investigational compound.