Phase I Open Label Dose Escalation Study to Investigate the Safety & Pharmacokinetics of AZD5312 in Patients With Androgen Receptor Tumors

This is a first time in man (FTIM), Phase I study to determine the Maxiimum Tolerated Dose, Recommended Phase 2 Dose, safety, tolerability and Pharmacokinetics of AZD5312. This is a multicentre study with sites in the United States and United Kingdom. Approximately 90 patients are expected to be enrolled in this study.The study involves two parts, Part A, Dose Escalation and Part B, Dose Expansion. AZD5312 will be given intravenously (IV) as an infusion, over one hour. For the purpose of planning, each 4 week period (28 days) will be called a Cycle. AZD5312 will initially be administered 4 times within the first 11 days, (on Days \[1, 4, 8 and 11\]± 2), with no dosing on sequential days. Patients will receive weekly treatments on Days 15 and 22 to complete Cycle. 1\. During the subsequent cycles, patients will receive weekly treatment on Days 1, 8, 15 and 22 (±2). The AZD5312 dose will not change unless dose reductions are required due to treatment-related toxicity. Patients will continue to receive AZD5312 until disease progression, intolerable toxicity, or discontinuation criteria have been met. Toxicity, Pharmacokinetics and biomarker data will be assessed throughout the study. Alternative infusion durations and/or treatment schedules may be explored if preliminary data suggest these would be more appropriate.