This is an open-label, multicenter, clinical study conducted in multiple parts to establish the safety, tolerability, Pharmacokinetic/Pharmacodynamic (PK/PD) profile, maximum tolerated dose (MTD) combinations (if observed) and recommended dose for expansion (RDE) combination for tuvusertib in combination with lartesertib (in Part A1), food effect on the PK of lartesertib as monotherapy followed by treatment with tuvusertib in combination with lartesertib in participants with specific tumor types (in Part A1.1), relative bioavailability of a tuvusertib tablet formulation vs capsule formulation followed by treatment with tuvusertib (capsule) in combination with lartesertib in participants with specific tumor types (in Part A1.2), safety/tolerability and early signs of clinical activity of tuvusertib (capsule)and lartesertib in combination in participants with prostate cancer harboring loss of function (LoS) mutation in the gene ATM based on historic data collected prior to prescreening in circulating tumor (ct) DNA (liquid biopsies) or tumor biopsies (in Part A2), safety/tolerability and early signs of clinical activity of tuvusertib and lartesertib in combination in participants with endometrial cancer harboring LoS mutation(s) in the gene ARID1A based on historic data collected prior to prescreening in ctDNA (liquid biopsies) or tumor biopsies (in Part A3), the relative bioavailability of a tuvusertib tablet formulation (TF1, test) compared to a capsule formulation (reference) will also be investigated (in Part A2/A3), and identify a potential set of MTD combinations, and establish the RDE for the combination of tuvusertib and avelumab in participants with metastatic or locally advanced unresectable solid tumors (in Part B1).
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Part A1: Number of Participants With Dose-Limiting Toxicities (DLTs) During the DLT Evaluation Period
Timeframe: Day 1 up to Day 28
Part A1: Number of Participants With Adverse Events (AEs) and Treatment-Related AEs
Timeframe: Baseline up to 18 months
Part B1: Number of Participants with Dose-Limiting Toxicities (DLTs) During the DLT Evaluation Period
Timeframe: Day 1 up to Day 28
Part B1: Number of Participants with AEs and Treatment-Related AEs
Timeframe: Baseline up to 18 months
Part A1: Change From Baseline in Pharmacodynamic (PD) Biomarker
Timeframe: Pre-dose up to approximately 1 month
Part B1: Change From Baseline in PD Biomarker
Timeframe: Pre-dose up to approximately 1 month
Part A1.1: PK Plasma Concentration of Lartesertib Under Fed and Fasted Conditions
Timeframe: 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
Timeframe: Up to 18 months after first dose administration
Part A2/A3: Number of Participants With AEs and Treatment-Related AEs
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: 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
Timeframe: Day -4 up to Period 1 Day 1