This is an open-label, Phase I, first-in-human (FIH) multicenter, clinical study conducted in multiple parts to establish the safety, tolerability and pharmacokinetic/pharmacodynamic (PK/PD) profile (with and without food) and early signs of efficacy of Tuvuseritib (M1774) as monotherapy and in combination with the poly (ADP-ribose) polymerase (PARP) inhibitor niraparib.
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Part A1, A4 and A5: Occurrence of Dose-Limiting Toxicities (DLTs) During the DLT Observation Period
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: 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)
Timeframe: 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)
Timeframe: 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)
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: Baseline up to 2.2 years
Part B1: Occurrence of Dose-Limiting Toxicities (DLTs) During the DLT Observation Period
Timeframe: 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
Timeframe: Assessed up to approximately 2.2 years