Study Evaluating the Safety, Tolerability, and Efficacy of Xaluritamig in Combination With Androgen Receptor Pathway Inhibitors in Participants With Metastatic Hormone-sensitive Prostate Cancer

Exclusion criteria

• Prior history of central nervous system (CNS) metastases. Note: Participants with asymptomatic and clinically stable dural metastases are eligible. • Unresolved toxicities from prior anti-tumor therapy (excluding those related to ongoing ADT and ARPI) not having resolved to Common Terminology Criteria for Adverse events (CTCAE) version 5.0 grade 1 or baseline, with the exception of alopecia or toxicities that are stable and well-controlled AND there is an agreement to allow inclusion by both the investigator and the sponsor. • Autoimmune disease requiring systemic immunosuppression within the past 2 years. • Participant with symptoms and/or clinical signs and/or radiographic signs that indicate an acute and/or uncontrolled active or systemic infection within 7 days prior to the first dose of study treatment. • Prior six-transmembrane epithelial antigen of the prostate 1 (STEAP1)-targeted therapy. • Prior radioligand therapy (RLT), poly-adenosine diphosphate ribose polymerase (PARP) inhibitor, cytotoxic chemotherapy, aminoglutethimide or ketoconazole for prostate cancer, or any prior systemic biologic therapy, including immunotherapy for prostate cancer. • Prior enzalutamide or apalutamide within 15 days prior to enrolment. • Requirement for chronic systemic corticosteroid therapy (prednisone dose greater than 10 mg per day or local equivalent) or any other immunosuppressive therapies (including anti TNFα therapies) unless stopped (with adequate tapering) within 7 days prior to dosing. • Prior radiotherapy to all metastatic sites of disease. Radiotherapy to some sites of metastatic disease for palliation will be permitted.