In all reported post-docetaxel trials and in the large phase III trials, patients start on the CYP17 inhibitor treatment at the time of disease progression. Trials examining other advanced malignant diseases such as lung cancer have shown that initiating an effective treatment earlier in the disease course at the end of a first-line chemotherapy (so called switch maintenance therapy) is beneficial in terms of progression free survival (PFS) but also overall survival (OS). This may also hold true for early administration of antihormonal agents in patients with mCRPC.