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Key Inclusion Criteria:

* Adult male patients with histologically or cytologically confirmed and documented adenocarcinoma of the prostate.
* At least 1 bone or visceral metastatic lesion (according to local radiology assessment by the investigator) present on baseline CT, MRI, or bone scan imaging obtained ≤28 days prior to enrollment. Lymph nodes as only site of metastases are not allowed.
* Patients with prostate cancer must have failed or refused available standard therapies, be intolerant or ineligible to receive such therapy, or for whom no standard therapy exists.
* Patients must have a castrate level of serum/plasma testosterone (\<50 ng/dL or \<1.7 nmol/L). Ongoing ADT (as defined by prior orchiectomy and/or ongoing GnRH analog/antagonist) is allowed prior to enrollment.
* Patients with an Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) ≤ 1.

Key Exclusion Criteria:

* Patients with CNS metastases.
* Patients with any other active malignancy other than prostate cancer. Exceptions to this criterion include the following: malignancies that were treated curatively at least 3 years before starting study treatment which have not recurred; basal cell carcinoma of the skin or squamous cell carcinoma of the skin that has undergone potentially curative local therapy or other tumors that will not affect life expectancy.

Other inclusion/exclusion criteria may apply

• Nagoya, Aichi-ken, Japan
• Kobe, Hyōgo, Japan
• Bunkyo Ku, Tokyo, Japan
• Koto Ku, Tokyo, Japan