Subject has received at least 2 lines of systemic therapy approved for mCRPC, with disease progression on the most recent systemic therapy as defined in Prostate Cancer Working Group 3 (PCWG3) recommendations.
Human immunodeficiency virus (HIV), hepatitis B virus (HBV), and/or hepatitis C virus (HCV)-infected subjects that have been cured or who are on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial.
An Eastern Cooperative Oncology Group (ECOG) Performance Status of ≤ 2.
Subject must have adequate heart, liver, bone marrow and kidney function (e.g. estimated glomerular filtration rate \[eGFR\] ≥ 50 mL/min, aspartate aminotransferase \[AST\]/alanine aminotransferase \[ALT\] ≤ 3 x upper limit of normal \[ULN\], hemoglobin \[Hgb\] ≥ 9 g/dL (without blood transfusion within 7 days from screening assessment), platelets ≥ 100,000 / mm\^3 (without platelet transfusion within 7 days from screening assessment), absolute neutrophil count \[ANC\] ≥ 1500 / mm\^3).
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Subject has been diagnosed with or treated for another malignancy within the past 2 years whose natural history or treatment may interfere with the safety or efficacy assessment of the investigational regimen.
History of neuroendocrine differentiation in the subject's disease.
Subject has a history of central nervous system (CNS) involvement by their mCRPC. Metastases stemming from bone are allowed.
