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TulmiSTAR-02: A two-part Phase I dose escalation study of tulmimetostat (DZR123) in combination with darolutamide or abiraterone followed by open-label, randomized, Phase II dose expansion study to assess the safety and efficacy of tulmimetostat in combination with darolutamide versus darolutamide alone in patients with metastatic hormone-sensitive prostate cancer

Status
Not yet recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-521873-15-00
Acronym
CDZR123C12101
Enrollment
54
Registered
2025-12-18
Start date
Unknown
Completion date
Unknown
Last updated
2026-01-16

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Metastatic hormone-sensitive prostate cancer

Brief summary

Phase I - Safety: DLTs during the first 28 days of combination treatment. Type, frequency and severity of AEs per CTCAE v5.0 and notable values in laboratory values, vital signs, and ECGs - Tolerability: Dose interruptions, dose reductions, drug discontinuations, dose intensity, and duration of exposure to study treatment (all study drugs) Phase II: BCR defined as PSA decline to < 0.2 ng/mL at 6 months, confirmed by a second PSA measurement ≥ 3 weeks later

Detailed description

Phase I: Plasma concentrations of tulmimetostat, darolutamide, and abiraterone, and derived PK parameters including AUC and Cmax Phase II: Radiographic progression free survival (rPFS), Overall survival (OS), Objective response (OR), Best overall response (BOR), Duration of response (DOR), PSA50 and Biochemical Response of <0.1 ng/mL, Time to castration–resistant prostate cancer (CRPC), Phase II: - Safety: Type, frequency and severity of treatment-emergent and treatment-related AEs per CTCAE version 5.0 and notable values in laboratory parameters, vital signs and ECGs - Tolerability: Dose interruptions, dose reductions, drug discontinuations, dose intensity, and duration of exposure to study treatment (all study drugs), Phase II: Plasma concentrations of tulmimetostat and darolutamide., Phase II: TTSSE defined as the time from randomization to the first new symptomatic pathological bone fracture, spinal cord compression, tumor-related orthopedic surgical intervention, requirement for radiation therapy to relieve bone pain or death from any cause, whichever occurs first

Interventions

DRUGDZR123
DRUGDAROLUTAMIDE
DRUGABIRATERONE
DRUG-

Sponsors

Novartis Pharma AG
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
Male
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Phase I - Safety: DLTs during the first 28 days of combination treatment. Type, frequency and severity of AEs per CTCAE v5.0 and notable values in laboratory values, vital signs, and ECGs - Tolerability: Dose interruptions, dose reductions, drug discontinuations, dose intensity, and duration of exposure to study treatment (all study drugs) Phase II: BCR defined as PSA decline to < 0.2 ng/mL at 6 months, confirmed by a second PSA measurement ≥ 3 weeks later

Secondary

MeasureTime frame
Phase I: Plasma concentrations of tulmimetostat, darolutamide, and abiraterone, and derived PK parameters including AUC and Cmax Phase II: Radiographic progression free survival (rPFS), Overall survival (OS), Objective response (OR), Best overall response (BOR), Duration of response (DOR), PSA50 and Biochemical Response of <0.1 ng/mL, Time to castration–resistant prostate cancer (CRPC), Phase II: - Safety: Type, frequency and severity of treatment-emergent and treatment-related AEs per CTCAE version 5.0 and notable values in laboratory parameters, vital signs and ECGs - Tolerability: Dose interruptions, dose reductions, drug discontinuations, dose intensity, and duration of exposure to study treatment (all study drugs), Phase II: Plasma concentrations of tulmimetostat and darolutamide., Phase II: TTSSE defined as the time from randomization to the first new symptomatic pathological bone fracture, spinal cord compression, tumor-related orthopedic surgical intervention, requirement for

Countries

France, Germany, Hungary, Italy, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026