The COSMYC Trial (COmbined Suppression of MYC)

The primary objectives of the study are first to determine if treatment with the combination of ZEN-3694 and Bipolar Androgen Therapy (i.e. BATZEN) will improve the progression-free survival in patients with metastatic castrate-resistant prostate cancer (mCRPC) compared with historical controls. The second primary objective is to determine if treatment with ZEN-3694 and Enzalutamide (i.e. ZENZA) after progression on Bipolar Androgen Therapy (BAT) will improve PSA-progression-free survival compared to historical controls. Asymptomatic patients with mCRPC without pain due to prostate cancer will be treated on an open label study to evaluate effectiveness of sequential treatment with the combination of ZEN-3694 and high dose testosterone in sequence with enzalutamide and ZEN-3694 to improve primary and secondary outcomes. Eligible patients are those with mCRPC who have progressive disease after treatment with a second-generation AR-axis inhibitor (Abiraterone, Enzalutamide, Darolutamide, or Apalutamide) used as treatment for castration-sensitive or castration-resistant disease. Patients will continue on Androgen Deprivation Therapy (ADT) with LHRH agonist (i.e. Zoladex, Trelstar, Eligard, or Lupron) or LHRH antagonist (Degarelix or Relugolix) if not surgically castrated throughout the duration of the study to inhibit endogenous testosterone production. One cycle of treatment will be 28 days.