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. Are you Eligible? (Inclusion Criteria) Male 18 years or older -Confirmed prostate adenocarcinoma -Have had previous...