TulmiSTAR-02: A Phase I/II Open-label Study of Tulmimetostat in Combination With Darolutamide vs. Darolutamide, and Tulmimetostat With Abiraterone in Patients With Metastatic Hormone-sensitive Prostate Cancer (mHSPC)

Eligibility Criteria

Key Inclusion Criteria:

* Adult men ≥ 18 years old with de novo or recurrent mHSPC (without neuroendocrine or small cell features), with at least one documented metastatic lesion. This lesion may be located in the bone, soft tissue/visceral region, or both.
* Participants must have castrate levels of testosterone, i.e., ≤ 50 ng/dL (≤ 1.7 nM).
* Eastern Cooperative Oncology Group (ECOG) performance status 0 to 2
* Adequate bone marrow and organ function
* Prior ADT: Participants must have started ADT at least 1 month but no more than 24 months before study entry and be willing to continue ADT during treatment
* Prior taxane use for mHSPC:

~ Phase I and II: Participants may have received, but not progressed on, one prior taxane-based therapy.
* Prior ARPI (abiraterone, enzalutamide, darolutamide, or apalutamide) is allowed in both Phase I and Phase II:

1. Prior ARPI use in biochemical recurrence (BCR) or curative treatment is allowed for any duration, provided therapy was discontinued and participant had no evidence of conventional imaging positive metastatic disease at that time
2. Prior ARPI use in mHSPC

* Phase I: Allowed for any duration.
* Phase II: Allowed prior exposure to ARPI is ≤6 months. Participants with ongoing use of darolutamide are not eligible.
* Other permitted prior local therapy for mHSPC:

* Phase I and II: Prior prostate-directed radiation or surgical intervention. Radiation must be completed before study entry; surgery at least 2 weeks prior.

Key Exclusion Criteria:

* Participants with evidence of mCRPC or biochemical recurrence / PSA only disease or asymptomatic prostate cancer without known metastatic disease and with no requirement for therapy and with normal PSA for ≥ 1 year prior to the start of study treatment.
* Participants with PSA levels of ≤ 0.2 ng/mL at the start of study treatment.
* Participants with a history of central nervous system (CNS) metastases who are neurologically unstable, symptomatic, or receiving corticosteroids for the purpose of maintaining neurologic integrity. Participants with CNS metastases are eligible if received therapy (surgery, radiotherapy, gamma knife), are asymptomatic and neurologically stable without corticosteroids. Baseline and subsequent radiological imaging for them must include evaluation of the brain.
* Concurrent use of first-generation anti-androgens (like bicalutamide). Prior use of a first-generation anti-androgen drug in the context of ADT initiation with a GNRH analog is allowed, provided it was administered for ≤14 days and the last dose was administered ≥7 days from the study entry.
* Systemic ketoconazole is used as antineoplastic treatment for prostate cancer.
* Previous exposure to radioligand therapy.
* Treatment with any investigational agent within 28 days (or 5 half-lives, whichever is longer) prior to study entry.
* Previous treatment with any Polycomb Repressive Complex 2 (PRC2) inhibitor, including but not limited to Enhancer of Zeste Homolog 2 (EZH2) inhibitors, EZH2/1 inhibitors, or embryonic ectoderm development (EED) inhibitors.
* Herbal products that may decrease PSA levels within 4 weeks prior to the start of study drug treatment and while on study
* Participants taking prohibited medication(s) prior to study treatment and for the duration of the study treatment or prohibited herbal product(s) that cannot be stopped 7 days prior to study treatment.

Other inclusion/exclusion criteria may apply