Phase 1/2A Study of TRC253, an Androgen Receptor Antagonist, in Metastatic Castration-resistant Prostate Cancer Patients

Inclusion Criteria: 1. Must have received at least 2 prior therapies approved for CRPC; including a prior AR inhibitor (e.g., enzalutamide or apalutamide). (Part 1 only) 2. Must have received enzalutamide or apalutamide. (Note: additional therapies approved for CRPC prior to enzalutamide or apalutamide are allowed.) (Part 2 only) 3. Must have shown clinical characteristics of acquired resistance to enzalutamide or apalutamide defined as: decline in serum PSA ≥50% compared to baseline serum levels by week 12 (±4 weeks) of enzalutamide or apalutamide treatment and before disease progression by PCWG3 PSA criteria, OR disease progression by PCWG3 radiographic criteria. (Part 2 only) Parts 1 and 2: 4. Histologically confirmed adenocarcinoma of the prostate with metastatic disease. 5. Male ≥18 years of age. 6. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. 7. Prior orchiectomy or serum testosterone levels \<50 ng/dL determined within 4 weeks prior to start of study drug. 8. Adequate baseline organ function. 9. Ongoing androgen depletion therapy with a gonadotropin-releasing hormone (GnRH) analog or inhibitor, or orchiectomy (i.e., surgical or medical castration). Note: patients who have not undergone orchiectomy must continue GnRH analog therapy for the duration of this protocol. 10. For patients previously treated with first generation anti-androgens (i.e., flutamide, nilutamide, or bicalutamide), discontinuation of flutamide or nilutamide therapy must occur \>4 weeks (\>6 weeks for bicalutamide) prior to start of study drug with no evidence of an anti-androgen withdrawal response (i.e., no decline in serum PSA). 11. For patients previously treated with chemotherapy, targeted therapy, immunotherapy, or treatment with an investigational anticancer agent, discontinuation must have occurred ≥2 weeks, or after at least 4 half-lives, whichever is longer, prior to study drug administration. For enzalutamide and apalutamide, the washout period will be at least 3 weeks prior to start of study drug with no evidence of an anti-androgen withdrawal response (i.e., no decline in serum PSA). 12. For patients previously treated with other agents approved for the treatment of prostate cancer (5-α reductase inhibitors, estrogens, others), discontinuation of therapy must have occurred ≥4 weeks prior to start of study drug. 13. Palliative radiotherapy (to bone or soft tissue lesions) must be completed \>2 weeks prior to start of study drug. 14. For patients receiving bone-loss prevention treatment (e.g., bisphosphonates or denosumab), the patient must be on stable dose ≥4 weeks prior to start of study drug. 15. A man who is sexually active with a woman of childbearing potential must agree to use a barrier method of birth control during the study and for 4 weeks after receiving the last dose of study drug. All men must also not donate sperm during the study and for 90 days after receiving the last dose of study drug. 16. Patient must be willing and able to adhere to the prohibitions and restrictions specified in this protocol. 17. Each patient must sign an informed consent form (ICF) indicating that he understands the purpose of and procedures required for the study and is willing to participate in the study. Consent is to be obtained prior to the initiation of any study-related tests or procedures that are not part of standard-of-care for the patient's disease. Exclusion Criteria: 1. History of seizures. 2. Previously documented or current brain metastases. 3. Untreated spinal cord compression. 4. Positive test result for human immunodeficiency virus. 5. History of clinically significant cardiovascular disease including. 6. Active or chronic hepatitis B or hepatitis C as demonstrated by hepatitis B surface antigen positivity and/or anti- hepatitis C virus positivity, respectively. Patients with clinically active or chronic liver disease, including liver cirrhosis of Child-Pugh class C, are also excluded. 7. Second primary malignancy that has not been in remission for greater than 3 years. Exceptions that do not require a 3 year remission include: related non-melanoma skin cancer or resected melanoma in situ. 8. Any serious underlying medical or psychiatric condition (e.g., alcohol or drug abuse), dementia or altered mental status or any issue that would impair the ability of the patient to receive or tolerate the planned treatment, to understand informed consent or that in the opinion of the investigator would contraindicate the patient's participation in the study or that would confound the results of the study. 9. Evidence of active viral, bacterial, or systemic fungal infection requiring systemic treatment within 7 days prior to the first dose of study drug. Patients requiring any systemic antiviral, antifungal, or antibacterial therapy for active infection must have completed treatment no less than 7 days prior to the first dose of study drug. 10. Known allergies, hypersensitivity, or intolerance to TRC253 or its excipients. 11. Enrollment in another interventional study. 12. Major surgery (e.g., requiring general anesthesia) within 3 weeks before screening, or has not fully recovered from prior surgery (i.e., unhealed wound), or surgery planned during the time the patient is expected to participate in the study. Note: patients with planned surgical procedures to be conducted under local anesthesia may participate. 13. Plan to father a child while enrolled in this study or within 90 days after the last dose of study drug.