Randomized phase IB/II study of enzalutamide with and without ribociclib in patients with metastatic castrate resistant, chemotherapy naïve prostate cancer that retains RB expression
This partially randomized phase IB/II trial studies the side effects and best dose of ribociclib when given with enzalutamide and to see how well they work compared to enzalutamide alone in treating patients with prostate cancer that does not respond to treatment with hormones (hormone resistant), has spread from the primary site (place where it started) to other places in the body (metastatic), is chemotherapy naïve, and retains retinoblastoma expression. Testosterone can cause the growth of prostate cancer cells. Hormone therapy using enzalutamide may fight prostate cancer by blocking the use of testosterone by the tumor cells. Ribociclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. It is not yet known whether enzalutamide works better when given with or without ribociclib in treating patients with prostate cancer.