A Modular Phase I/IIa, Open-label, Multi-centre Study to Assess the Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of AZD0516 as Monotherapy and in Combination With Anti-cancer Agents in Participants With Metastatic Prostate Cancer

Main Inclusion Criteria: * Histologically or cytologically confirmed diagnosis of metastatic adenocarcinoma of the prostate. Focal high grade neuroendocrine features are permitted. * Measurable PSA ≥ 1 μg/L (≥ 1 ng/mL). * Surgically or medically castrated with serum testosterone levels ≤ 50 ng/dL (≤ 1.75 nmol/L) within ≤ 28 days before treatment allocation. Ongoing androgen deprivation therapy (ADT) with a gonadotropin releasing hormone (GnRH) modulator for participants who have not undergone bilateral orchiectomy must be initiated at least 2 weeks prior to consent and must continue throughou…