ARASTEP: This study is evaluating whether adding a hormone therapy called darolutamide to androgen deprivation therapy (ADT) is more effective than ADT alone in people with high-risk biochemical recurrence of prostate cancerA Randomized, Double-blind, Placebo-controlled Phase 3 Study of Darolutamide Plus Androgen Deprivation Therapy (ADT) Compared With Placebo Plus ADT in Patients With High-risk Biochemical Recurrence (BCR) of Prostate Cancer

Inclusion

• Capable of giving signed informed consent as described which includes compliance with the requirements, restrictions listed in the informed consent form (ICF), and in this protocol.
• Male ≥18 years of age at the time of signing the informed consent.
• Histologically or cytologically confirmed adenocarcinoma of prostate.
• Prostate cancer initially treated by: radical prostatectomy (RP) followed by adjuvant radiotherapy (ART), or salvage radiotherapy (SRT), or RP in participants who are unfit (or refused) for ART or SRT, or primary radiotherapy (RT).
• High-risk biochemical recurrence (BCR), defined as Prostate-specific antigen doubling time (PSADT) <12 months calculated using the formula provided by the Sponsor, and PSA ≥0.2 ng/mL after ART or SRT post RP or after RP in participants who are unfit for ART or SRT (local or central values accepted), or PSA ≥2 ng/mL above the nadir after primary RT only (local or central values accepted).
• Participants must undergo prostate-specific membrane antigen positron emission tomography/computed tomography (PSMA PET/CT) within the 42-day Screening period using either 18F-DCFPyL (piflufolastat F 18) or 68Ga-PSMA-11 which will be assessed by blinded independent central review (BICR) to identify at least one PSMA PET/CT lesion of prostate cancer.
• Serum testosterone ≥150 ng/dL (5.2 nmol/L) (local or central values accepted).
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• Blood counts at screening: Hemoglobin ≥9.0 g/dL (participant must not have received blood transfusion within 7 days prior to sample being taken); Absolute neutrophil count (ANC) ≥1.5x10^9/L (participant must not have received any growth factor within 4 weeks prior to sample being taken); Platelet count ≥100x10^9/L.
• Screening values of: Alanine aminotransferase (ALT) ≤1.5 x upper limit of normal (ULN); Aspartate aminotransferase (AST) ≤1.5 x ULN; Total bilirubin (TBL) ≤1.5 ULN, (except participants with a diagnosis of Gilbert's disease); Estimated glomerular filtration rate (eGFR) >40 ml/min/1.73 m^2 calculated by the CKD-EPI formula.
• Sexually active male participants must agree to use contraception as detailed in the protocol during the Treatment period and for at least 1 week after the last dose of study treatment, and refrain from donating sperm during this period.