This is a non-interventional, multicenter, prospective registry of patients with a confirmed diagnosis of adenocarcinoma of the prostate presenting with mCRPC, based on documented metastatic prostate cancer and documented castration resistance. Castrate-resistant prostate cancer is defined by disease progression despite testosterone \<50 ng/dL, and/or androgen deprivation therapy, and/or a history of orchiectomy, and may present as a continuous rise in prostate-specific antigen (PSA), and/or worsening of existing disease/symptoms, and/or the appearance of new metastases. Observational methodology will be used to capture data. The decision of patients to take part in the registry will not influence their medical care. Treatment decisions will be made at the discretion of the treating physician, per routine clinical practice. Only data available from routine clinical practice will be collected. It is expected that approximately 3,000 patients will participate in this registry. To ensure a patient population representative of clinical practice and to reduce selection bias, all patients meeting the eligibility criteria at a participating site should be consecutively enrolled in the registry, irrespective of their treatment. The planned total duration of the registry will be 5.5 years from the date that the first patient is enrolled, irrespective of the country or registry site. The anticipated duration of patient enrollment is 2.5 years. The maximum duration of follow-up for individual patients in the observational period of the registry will be 3 years, regardless of when they are enrolled. The 3-year period of the observational period will document the sequencing of systemic mCRPC treatments during routine clinical practice, considering the life expectancy of patients with mCRPC in the registry. Unless specified otherwise per local regulations, all patients must give their informed consent to participate in this registry before data collection (ie, data entry into the case report form \[CRF\]) is performed. Patients will be enrolled at the time of initiation of a new systemic mCRPC treatment or during a period when a patient is considered to be in surveillance according to clinical practice. Baseline data collection will include details of the patient's prostate cancer history and prior prostate cancer treatment. This will be followed by a prospective observational period during which patients may cycle through multiple systemic mCRPC treatment periods and periods of surveillance. During the observational period, data will be collected at the following time points of a patient's course of treatment in routine clinical practice: initiation of a new systemic mCRPC treatment; termination of a systemic mCRPC treatment; when the duration of a systemic mCRPC treatment or surveillance period is \>3 months, data collection will be performed at a minimum frequency of 3-monthly intervals during that period. Survival data will be collected for all patients 3 years after their enrollment or at the close of the registry, whichever occurs first, except for those patients who withdraw their consent prior to completing the observation period.
