Summary: The purpose of this study is to identify the recommended phase 2 regimen(s) RP2R(s) of JNJ-78278343 and combination agent in Part 1 (dose escalation) and to determine safety at the putative RP2R(s) of JNJ-78278343 with the combination agent in Part 2 (dose expansion).

Summary: The main objective of the study is to compare overall survival in participants receiving xaluritamig versus investigator's choice (cabazitaxel or second androgen receptor-directed therapy \[ARDT\]).

Summary: This phase II trial evaluates whether genetic testing in prostate cancer is helpful in deciding which study treatment patients are assigned. Patient cancer tissue samples are obtained from a previous surgery or biopsy procedure and tested for deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) abnormalities or mutations in their cancer. Valemetostat tosylate is in a class of medications called ...

Summary: Substudy 01A is part of a larger research study that is testing experimental treatments for metastatic castration-resistant prostate cancer (mCRPC). The larger study is the umbrella study (U01). The goal of substudy 01A is to evaluate the safety and efficacy of opevesostat-based treatment combinations, or as a single agent, in participants with mCRPC. This substudy will have two phases: a safety l...

Summary: The purpose of this study is to determine whether \[225Ac\]Ac-PSMA-617 (AAA817), given for up to 6 cycles at a dose of 10 Megabecquerel (MBq) +/- 10%, plus androgen receptor pathway inhibitor (ARPI), improves the radiographic progression free survival (rPFS) compared to investigator's choice of standard of care (SOC) (ARPI change or taxane-based chemotherapy) in adult participants with PSMA-positi...

Summary: The purpose of this study is to find out what treatment works best for participants with metastatic prostate cancer that are not responding to hormone treatment and docetaxel and are also Prostate-specific membrane antigen(PSMA) positive.

Summary: Despite improvements in treatment, metastatic prostate cancer remains incurable, especially in the case of pretreated metastatic castration-resistant disease (mCRPC), where treatment options are limited, leading to an unmet need. The paradigm shift in the treatment of metastatic hormone-sensitive prostate cancer (mHSPC) has affected the treatment landscape for mCRPC patients. Many have already rec...

Summary: The purpose of this research study is to find out what effects (good and bad) omeprazole and cabazitaxel, or omeprazole and docetaxel, has on participants and their condition. Investigators believe omeprazole may help the other medications work.

Summary: In patients with metastatic prostate cancer (PCa) who receive androgen deprivation therapy (ADT), the sensitivity to castration will eventually disappear due to the selection of castration-refractory clones. This will lead to the stage of metastatic castration-refractory prostate can-cer (mCRPC), which is incurable and results in a median overall survival of 2-3 years. Treatment options for patien...

Summary: To find the best dose of ADI-PEG20 that can be given in combination with carboplatin and cabazitaxel to patients with AVPC.

Summary: ProBio is an international, outcome-adaptive, multi-arm, open-label, multiple assignment randomized biomarker driven platform trial in patients with metastatic prostate cancer. Patients will be randomized to control or experimental treatment arms. Patients in the control arm will receive standard of care following national guidelines. Patients in the experimental arm will be randomized to treatmen...

Summary: This phase III trial compares the effect of adding carboplatin to the standard of care chemotherapy drug cabazitaxel versus cabazitaxel alone in treating prostate cancer that keeps growing even when the amount of testosterone in the body is reduced to very low levels (castrate-resistant) and that has spread from where it first started (primary site) to other places in the body (metastatic). Carbop...