Trial of ARV-110 in Patients With Metastatic Castration Resistant Prostate Cancer

Inclusion Criteria:

Part A:

1. Patients must be male and at least 18 years of age at the time of signing the informed consent.
2. Patients must present with histological, pathological, or cytological confirmed diagnosis of advanced or metastatic castration resistant adenocarcinoma of the prostate.
3. Patients must have progressed on at least 2 prior approved systemic therapies for CRPC (at least one must be abiraterone or enzalutamide).
4. Patients with progressive mCRPC
5. Patients must have ongoing ADT with a gonadotropin releasing hormone analog or inhibitor, or orchiectomy (surgical or medical castration).

Part B:

1. Patients must be male and at least 18 years of age at the time of signing the informed consent.
2. Patients must present with histological, pathological, or cytological confirmed diagnosis of advanced or metastatic castration resistant adenocarcinoma of the prostate.
3. Patients must have received at least one but no more than two prior second generation anti-androgen agents (e.g., enzalutamide or abiraterone) for CRPC.
4. Patients must have received no more than one prior chemotherapy regimen in each of the following settings: castrate sensitive and castrate resistant prostate cancer.
5. Patients must have ongoing ADT with a gonadotropin releasing hormone analog or inhibitor, or orchiectomy (surgical or medical castration).

Part B - Phase 2 Expansion Cohort Subgroup 4

1. Patient has received only one prior AR second generation therapy (e.g., abiraterone or enzalutamide) either as treatment for CSPC or CRPC and no more than 1 regimen in CRPC setting.
2. No prior chemotherapy

Exclusion Criteria:

Part A:

1. Patients with known symptomatic brain metastases requiring steroids (above physiologic replacement doses)
2. Major surgery (as defined by the Investigator) within 4 weeks of first dose of study drug.
3. Radiation therapy within 4 weeks of first dose of study drug or prior irradiation to >25% of the bone marrow. Palliative radiation for the alleviation of pain due to bone metastasis will be allowed during the study
4. Systemic anti cancer therapy within 2 weeks of first dose of study drug (6 weeks for bicalutamide, mitomycin C, or nitrosoureas and 4 weeks for abiraterone). Patients are ineligible if they received any other type of anti cancer agent (except agents to maintain castrate status) within 2 weeks before first dose of study drug.

Part B:

1. Patients with known symptomatic brain metastases requiring steroids (above physiologic replacement doses)
2. Major surgery (as defined by the Investigator) within 4 weeks of first dose of study drug.
3. Radiation therapy within 4 weeks of first dose of study drug or prior irradiation to >25% of the bone marrow. Palliative radiation for the alleviation of pain due to bone metastasis will be allowed during the study
4. Systemic anti cancer therapy within 2 weeks of first dose of study drug (6 weeks for bicalutamide, mitomycin C, or nitrosoureas and 4 weeks for abiraterone). Patients are ineligible if they received any other type of anti cancer agent (except agents to maintain castrate status) within 2 weeks before first dose of study drug.