A Study of Valemetostat (DS-3201b) in Combination With Darolutamide in Metastatic Castration Resistant Prostate Cancer (mCRPC)

Official title

A Phase 1, Multicenter Trial Evaluating the Safety, Tolerability, and Efficacy of Valemetostat (DS-3201) in Combination With Darolutamide in Metastatic Castration Resistant Prostate Cancer (mCRPC)

Overview

This study will assess the safety and tolerability of valemetostat in combination with darolutamide in participants with Metastatic Castration Resistant Prostate Cancer (mCRPC).

Interventions

• Drug Valemetostat
  Dose Escalation Part: Valemetostat will be administered at escalating doses. Dose Expansion Part: Valemetostat will be administered at 2 or more dose levels.
• Drug Darolutamide
  Dose Escalation Part: Darolutamide will be administered at a standard dose. Dose Expansion Part: Darolutamide will be administered at a standard dose.

Primary outcome measures

• Part 1: Number of participants with Dose-Limiting Toxicities (DLTs) [Time frame: Day 1 up to Day 28]
• Part 1 and 2: Number of Participants Experiencing a Treatment Emergent Adverse Event (TEAE) [Time frame: From Screening up to approximately 5 years]

Secondary outcome measures (9)

• Prostate-Specific Antigen (PSA) 50 Response Rate [Time frame: From Screening up to approximately 5 years]
• Prostate-Specific Antigen (PSA) 90 Response Rate [Time frame: From Screening up to approximately 5 years]
• Prostate-Specific Antigen (PSA) Nadir Response Rate [Time frame: From Screening up to approximately 5 years]
• Radiographic Progression-Free Survival (rPFS) [Time frame: From Screening up to approximately 5 years]
• Overall Survival (OS) [Time frame: From Screening up to approximately 5 years]
• Time to PSA Progression [Time frame: From Screening up to approximately 5 years]
• Objective Response Rate (ORR) [Time frame: From Screening up to approximately 5 years]
• Time to First SSRE (symptomatic bone fractures, spinal cord compression, surgery, or radiation to the bone, whichever is first) [Time frame: From Screening up to approximately 5 years]
• Total and Unbound Plasma Concentration of Valemetostat in Combination with Darolutamide [Time frame: Cycle 1: Day 1, Day 8, Day 15. Cycles 2-5: Day 1 (Each cycle is 28 days)]

Eligibility criteria

Inclusion criteria

The clinical site will screen for the full inclusion criteria per protocol.

• Adult males ≥18 years of age at the time the ICF is signed (Please follow local regulatory requirements if the legal age of consent for trial participation is >18 years old).
• Histologically confirmed adenocarcinoma of the prostate. Cases exhibiting neuroendocrine differentiation are eligible for enrollment, except those with a diagnosis of pure small cell carcinoma, which is excluded.
• Evidence of disease progression as per the PCWG3 modified RECIST v1.1 criteria.
• Evidence of metastatic disease as confirmed by radiographic imaging (CT, MRI, or bone scan).
• Ongoing androgen deprivation at time of enrollment.

• For participants currently being treated with luteinizing hormone-releasing hormone agonists or antagonists, therapy must have been initiated at least 4 weeks prior to enrollment and treatment must be continued throughout the trial.
• Baseline PSA expression level of ≥2 ng/mL, according to a documented testing result.
• Prior therapy with an Androgen Receptor Pathway Inhibitors (ARPI).
• ECOG PS of 0 or 1 assessed no more than 28 days prior to enrollment.
• Is willing and able to provide adequate fresh or archival tumor samples with sufficient quantity and tissue quality. A mandatory newly obtained pretreatment biopsy is required, if not clinically contraindicated and at an acceptable risk as determined by the investigator. If newly obtained tissue samples are not possible to obtain, archival tissue obtained from a lesion not previously irradiated and collected after the most recent prior therapy is acceptable.
• A male participant capable of producing sperm is eligible to participate if he agrees to the following during the intervention period and for at least the time needed to eliminate each trial intervention. The length of time required to continue contraception after the last dose for each trial intervention is 3 months.

• Must not freeze or donate sperm starting at screening and throughout the Treatment Period, and for at least 3 months after the final trial intervention administration.

Note: Preservation of sperm should be considered before enrollment in this trial.

• Adhere to either of the following contraception methods:

• True abstinence from penile-vaginal intercourse, when this is in line with the preferred and usual lifestyle of the participant, OR
• Uses a penile/external condom when having penile-vaginal intercourse with an NPOCBP, PLUS partner use of an additional contraceptive method, as a condom may break or leak Contraceptive use should be consistent with local regulations regarding the methods of contraception for those participating in clinical trials. If the contraception requirements in the local label for any trial interventions are more stringent than those above, the local label requirements are to be followed.

Exclusion criteria

The clinical site will screen for the full exclusion criteria per protocol.

• Prior treatment with any epigenetic agents including but not limited to EZH1, EZH2, EZH1/2, or PRC2 inhibitors.
• Has a super scan as seen in the baseline bone scan. A super scan is defined as an intense symmetric activity in the bones and diminished renal parenchymal activity on baseline bone scan, such that the presence of additional metastases in the future could not be evaluated.
• Clinically active brain metastases, spinal cord compression, or leptomeningeal carcinomatosis, defined as untreated or symptomatic, or requiring therapy with steroids or anticonvulsants to control associated symptoms.
• Uncontrolled or significant cardiovascular disease,
• Prior malignancy, active within the previous 3 years except for locally curable cancers that have been apparently cured or successfully resected, such as basal or squamous cell carcinoma, superficial bladder cancer, carcinoma in situ of the stomach, or carcinoma in situ of the breast.
• Has active or uncontrolled HBV infection.
• Has active or uncontrolled HCV infection.
• Has active or uncontrolled HIV infection.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

Non-randomized

Model

Single group

Masking

Open label

Primary purpose

Treatment

Study locations

United States · 9 centers

• University of California San Diego Moores Cancer Center — La Jolla
• Beth Isreal Deaconess Medical Center — Boston
• Dana Farber Cancer Institute — Newton
• Cancer & Hematology Center — Grand Rapids
• Northwell Health Cancer Institute (START NY) — Lake Success
• Carolina Urologic Research Center — Myrtle Beach
• NEXT Oncology — San Antonio
• Virginia Cancer Specialists (NEXT Virginia) — Fairfax
• … and 1 more center

China · 5 centers

• Sun Yatsen University Cancer Center — Guangzhou
• Fudan University Shanghai Cancer Center - Xuhui District — Shanghai
• Fudan University Shanghai Cancer Center — Shanghai
• Shanghai General Hospital — Shanghai
• The First Affiliated Hospital of Wenzhou Medical University — Wenzhou

Japan · 4 centers

• National Cancer Center Hospital East — Kashiwa-shi
• Kobe City Med Cen Gen Hosp. — Kobe
• Cancer Institute Hospital of JFCR — Kōtoku
• Toho University Sakura Medical Center — Sakura-shi

Ireland · 1 center

• Mater Misericordiae University Hospital — Dublin

Identifiers

NCT: NCT07244341 · DS3201-343 · 2025-522512-16-00

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗