- Any anti-cancer therapy, including chemotherapy, hormonal therapy, or radiotherapy, within 3 weeks or 5 half-lives (for systemic agents), whichever is shorter, prior to initiation of study treatment with the following exceptions: hormonal therapy with gonadotropin-releasing hormone (GnRH) agonists or antagonists for prostate cancer; herbal therapy > 1 week prior to Day 1; hormone-replacement therapy or oral contraceptives; palliative radiotherapy for bone metastases > 2 weeks prior to Day 1