Debiopharm International SA
The primary purpose of the Phase 1 (Dose Escalation) of this study is to identify the dose-limiting toxicities (DLTs) of Debio 0123 combined with temozolomide (TMZ) (Arm A) and with TMZ and radiotherapy (RT) (Arms B and C) and to characterize the safety and tolerability of these combinations in adult participants with glioblastoma (GBM). Arm B which was previously added to the protocol, has been permanently halted per the safety monitoring committees' decision on the safety findings of this arm. The primary purpose of Phase 1 (Dose expansion) of the study is to assess the doses studied under Phase 1 (Dose Escalation) Arm A and identify the recommended dose (RD) for further development. The Phase 2 will start once the RD Phase 1 has been defined. The primary objective of Phase 2 is to assess the efficacy of Debio 0123 at the RD for further development in combination with TMZ, compared to the standard of care (SOC) in adult participants with GBM.
Screening Inclusion Criteria for Phase 1 and Phase 2: * Signed written informed consent approved before undertaking any study-specific procedures. * Age ≥18 years of age. * Willing to provide archived or fresh tumor sample, if available. Receipt of tumor sample is not required for the start of study treatment. * Adequate bone marrow, hepatic, and renal function. * Willingness and ability to comply with scheduled visits, treatment plans, laboratory tests, and other study procedures. * Willing to practice highly effective methods of contraception. * Life expectancy of at least 3 months in the b…
Administered as capsules.
Administered as capsules.
Administered in accordance with the local clinical practice and applicable Radiation Therapy Oncology Group (RTOG) or the European Organization for Research and Treatment of Cancer (EORTC) guidelines.