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Tuvusertib

Phase 1

Metastatic or Locally Advanced Unresectable Solid Tumors | Small molecule | Oncology |Merck KGaA|Last Updated: May 28, 2026

Success Probability

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment120

FDA Designations

No designations recorded

Clinical trial landscape

Tuvusertib · 1 trial · 1 indication

Phase 1 1
NCT05396833Study of Tuvusertib (M1774) in Combination With DNA Damage Response Inhibitor or Immune Checkpoint Inhibitor (DDRiver Solid Tumors 320)Metastatic or Locally Advanced Unresectable Solid Tumors
ACTIVE NOT_RECRUITING120 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study of Tuvusertib (M1774) in Combination With DNA Damage Response Inhibitor or Immune Checkpoint Inhibitor (DDRiver Solid Tumors 320)
Metastatic or Locally Advanced Unresectable Solid TumorsUnlock trial analytics

Study Endpoints

Primary Endpoints

Part A1: Number of Participants With Dose-Limiting Toxicities (DLTs) During the DLT Evaluation Period
Day 1 up to Day 28
Part A1: Number of Participants With Adverse Events (AEs) and Treatment-Related AEs
Baseline up to 18 months
Part B1: Number of Participants with Dose-Limiting Toxicities (DLTs) During the DLT Evaluation Period
Day 1 up to Day 28
Part B1: Number of Participants with AEs and Treatment-Related AEs
Baseline up to 18 months
Part A1: Change From Baseline in Pharmacodynamic (PD) Biomarker
Pre-dose up to approximately 1 month

The PD biomarker of histone variant will be measured by flow cytometry.

Part B1: Change From Baseline in PD Biomarker
Pre-dose up to approximately 1 month

The PD biomarker of histone variant will be measured by flow cytometry.

Part A1.1: PK Plasma Concentration of Lartesertib Under Fed and Fasted Conditions
Day -1 up to Period 1 Day 1
Part A2/A3: Objective Response according to Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 as assessed by Investigator
Up to 18 months after first dose administration
Part A2/A3: Number of Participants With AEs and Treatment-Related AEs
Baseline up to 18 months
Part A1.2: Relative Bioavailability Based on Area Under the Plasma Concentration Curve From Time Zero Extrapolated to Infinity [Frel(AUC0-inf)] of Tuvusertib Test Treatment Compared to Tuvusertib Reference Treatment
Day -4 up to Period 1 Day 1
Part A1.2: Relative Bioavailability Based on Area Under the Plasma Concentration Curve From Time Zero to Last Quantifiable Concentration [Frel(AUC0-t)] of Tuvusertib Test Treatment Compared to Tuvusertib Reference Treatment
Day -4 up to Period 1 Day 1
Part A1.2: Ratio Maximum Observed Plasma Concentration (Ratio[Cmax]) of Tuvusertib Test Treatment Compared to Tuvusertib Reference Treatment
Day -4 up to Period 1 Day 1
Part A2/A3: Relative Bioavailability Based on Area Under the Plasma Concentration Curve From Time Zero Extrapolated to Infinity [Frel(AUC0-inf)] of Tuvusertib Test Treatment Compared to Tuvusertib Reference Treatment
Day -4 up to Period 1 Day 1
Part A2/A3: Relative Bioavailability Based on Area Under the Plasma Concentration Curve From Time Zero to Last Quantifiable Concentration [Frel(AUC0-t)] of Tuvusertib Test Treatment Compared to Tuvusertib Reference Treatment
Day -4 up to Period 1 Day 1
Part A2/A3: Ratio Maximum Observed Plasma Concentration (Ratio[Cmax]) of Tuvusertib Test Treatment Compared to Tuvusertib Reference Treatment
Day -4 up to Period 1 Day 1

Secondary Endpoints

Part A1: Pharmacokinetic (PK) Plasma Concentration of Tuvusertib and Lartesertib
Pre-dose up to approximately 6 months
Parts A1.2 and B1: Pharmacokinetic (PK) Plasma Concentration of Tuvusertib
Pre-dose up to approximately 6 months
Part B1: Pharmacokinetic (PK) Serum Concentration of Avelumab
Pre-dose up to approximately 18 months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A1: Tuvusertib and LartesertibEXPERIMENTAL -
Part A1.1: Tuvusertib and LartesertibEXPERIMENTALAssessment of the Effect of Food (Low-fat Meal) on the PK of M4076 Monotherapy Followed by Treatment with M1774 in Combination with M4076
Part A1.2: Tuvusertib and LartesertibEXPERIMENTALRelative Bioavailability Assessment of Tuvusertib Tablet (TF1) vs Capsule Followed by Treatment with Tuvusertib in Combination with Lartesertib
Part A2: Tuvusertib and LartesertibEXPERIMENTALATM in prostate cancer (Part A2)
Part A3: Tuvusertib and LartesertibEXPERIMENTALARID1A in endometrial cancer
Part A2/A3: Tuvusertib and LartesertibEXPERIMENTALTablet formulation (TF1, test) compared to a capsule formulation (reference)
Part B1: Tuvusertib and AvelumabEXPERIMENTAL -

Interventions

NameTypeDescription
TuvusertibDRUGTuvusertib will be administered orally once daily over a defined period of time in Part A1, A1.1, A1.2, A2, A3, A2/A3, and Part B1 until disease progression, death, discontinuation, or end of study.
LartesertibDRUGLartesertib will be administered orally once daily over a defined period of time in Part A1, A1.1, A1.2, A2, A3, A2/A3, until disease progression, death, discontinuation, or end of study.
AvelumabDRUGAvelumab will be administered by intravenous infusion once a day over a defined period of time in Part B1 until disease progression, death, discontinuation, or end of study.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites22

Inclusion Criteria: * Parts A1, A1.1, A1.2, A2, A3, and A2/3: Participants with metastatic or locally advanced unresectable solid tumors refractory to standard therapy or for which no standard therapy is judged appropriate by the Investigator, which may convey clinical benefit, or who cannot tolera...

Countries:United StatesAustraliaCanadaSouth KoreaSpain
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Frequently asked questions about Tuvusertib

What is Tuvusertib used for?

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 and has not been approved by regulatory authorities.

Who is developing Tuvusertib?

Tuvusertib is being developed by Merck KGaA, a pharmaceutical company traded under the ticker MKGAF. The drug is in Phase 1 clinical trials for oncology indications.

What phase is Tuvusertib in?

Tuvusertib is in Phase 1 clinical development. It is an investigational drug being studied in a single active clinical trial for metastatic or locally advanced unresectable solid tumors, and it has not yet been approved.

What clinical trials is Tuvusertib in?

Tuvusertib is being evaluated in clinical trial NCT05396833, titled 'Study of Tuvusertib (M1774) in Combination With DNA Damage Response Inhibitor or Immune Checkpoint Inhibitor (DDRiver Solid Tumors 320)'. This Phase 1 trial is active but not recruiting, with an enrollment of 120 participants.

Is Tuvusertib the same as M1774?

Yes, Tuvusertib is also known as M1774. The clinical trial NCT05396833 refers to the drug as Tuvusertib (M1774), confirming that both names identify the same investigational compound.

Where is the Tuvusertib clinical trial being conducted?

The Tuvusertib clinical trial NCT05396833 is being conducted in multiple countries, including the United States, Australia, Canada, South Korea, and Spain. The trial enrolls adults aged 18 years and older with metastatic or locally advanced unresectable solid tumors.