Prostate cancer is a health problem in many Countries worldwide. Understanding the essential function of androgens in the prostate physiology led to the development of hormonal blockade as a therapeutic option in advanced disease, with limited response with time and development of resistance. In this stage, where castration resistant prostate cancer (CRPC) is defined, it is associated with poor prognosis because survival varies between 18 and 24 months. Even with castration levels, tumors are dependent on the functional androgen receptor (AR). In this paper, we analyze pretreatment clinical parameters such as prognostic or progression-predictive biomarkers, castration resistance mechanisms, the development of new technologies for the use of the so called liquid biopsies from biological fluids and the identification of circulating tumor cells as CRPC response and progression biomarkers. Currently ongoing clinical trials are partially oriented to the search of new prognostic and predictive biomarkers, that will enable to open up precision medicine and so to improve oncologicol patient's quality of life with it.