Assess the Safety, Tolerability, PK and Anti-tumor Efficacy of DZD2269 in Patients With MCRPC

Inclusion Criteria: 1. Informed consent form, taken prior to any study specific procedures, sampling and/or analyses. 2. Male patients age ≥ 18 years (≥ 19 in S. Korea), ECOG status 0-1, Predicted life expectancy ≥ 12 weeks, 3. All patients enrolled must have histologically confirmed diagnosis of adenocarcinoma of the prostate, with metastatic disease, and must also previously progressed on standard-of-care (SoC) therapy (i.e., abiraterone or enzalutamide, taxanes such as docetaxel or cabazitaxel) despite castrate levels of testosterone. 4. Be willing to provide blood samples and paired tumor tissue (if accessible) for the exploratory biomarker research 5. Total testosterone \< 50 ng/dL at screening (except for subjects with prior orchiectomy, where testosterone does not need to be measured). 6. Adequate bone marrow reserve and organ system functions 7. LVEF ≥ 55% assessed by ECHO or MUGA Exclusion Criteria: 1. Cytotoxic chemotherapy from a previous treatment regimen within 21 days of the first dose of study treatment. 2. Major surgery procedure (excluding placement of vascular access), or significant traumatic injury within 4 weeks of the first dose of study treatment, or have an anticipated need for major surgery during the study. 3. Prior exposure to therapeutic anticancer vaccines 4. Prior immune-mediated therapy including, but not be limited to, anti-CTLA-4, anti-PD1, anti-PDL1 and anti-PDL2 must have a wash-out period of ≥ 30 days before dosing 5. Prior/concomitant therapy with any other A2aR antagonist. 6. Live vaccines within 28 days prior to first dose. 7. Radiotherapy with a limited field for palliation within 1 week of the first dose of study treatment. 8. Patients currently receiving (or unable to stop using) medications or herbal supplements known to be potent inhibitors or inducers of CYP3A4, sensitive CYP3A4 substrates with narrow therapeutic index, and sensitive MATE1 and MATE2-K substrates with narrow therapeutic range 9. Any unresolved toxicities \> Grade 1 (except alopecia). 10. Bone pain due to metastatic bone disease that cannot be managed with a routine, stable dose of a narcotic analgesic 11. Active infections as outlined in protocol 12. Spinal cord compression. 13. Patients who require systemic use of corticosteroids (at any dose) 14. Refractory nausea and vomiting if not controlled by supportive therapy 15. Cardiac criteria as outlined in protocol 16. Prior malignancy, except for adequately treated basal cell or squamous cell skin cancer or other cancer from which the patient has been disease free for ≥ 2 years or which will not limit survival to \< 2 years