Additional Study Information: The main purpose of the study is to determine whether the study drug, ONC-392, together with a standard of care drug PLUVICTO (Lutetium Lu 177 Vipivotide Tetraxetan), are safe and well tolerated, and whether two drugs are effective in treating prostate cancer, in comparison with the standard of care PLUVICTO alone. ONC-392 has not yet been approved by the Food and Drug Administration (FDA). PLUVICTO is FDA-approved but is not approved to be combined with ONC-392.