SUrGery With or Without dARolutamide in High-risk and/or Locally Advanced Prostate Cancer (SUGAR)

Inclusion Criteria: Age ≥18 years Histologically confirmed adenocarcinoma of the prostate High-risk and/or locally advanced prostate cancer diagnosis defined by: One of the following criteria is sufficient to define a high-risk and/or locally advanced prostate cancer: ISUP grade 4 or 5 on biopsies cN1 disease in MRI or PET-Scan T3b disease in MRI If these criteria are not being identified, two of the following criteria are necessary to define high-risk and/or locally advanced prostate cancer: PSA value >20 ng/ml ≥ 50% of the core of biopsies need to be positive for adenocarcinoma ISUP grade 3 T3a disease in MRI No distant metastasis confirmed by imaging (i.e., MRI/CT-Scan and Bone Scintigraphy or PET-Scan) Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0-1 Patient eligible for radical prostatectomy as per the investigator Adequate organ function within 28 days prior to start of treatment determined by the following central laboratory values: Aspartate aminotransferase (AST), alanine aminotransferase (ALT), and total bilirubin less than the upper limit of normal (ULN; note that in subjects with Gilbert's syndrome, if total bilirubin is >1.5 X ULN, measure direct and indirect bilirubin. If direct bilirubin is ≤1.5 X ULN, the subject may be eligible); Serum creatinine <1.5 mg/dL; Platelets ≥75,000/uL, without transfusion and/or growth factors within 1 month prior to randomization; Hemoglobin >12.0 g/dL (7.4 mmol), without transfusion and/or growth factors within 1 month prior to randomization; Adequate renal function: creatinine clearance/eGFR within normal limits to baseline assessed as per local standard method; Normal cardiac function according to local standard by 12-lead Electrocardiogram (ECG) (complete, standardized 12-lead recording). Patient able to receive darolutamide for up to 9 months as per the investigator Patient able to swallow whole study drug tablets Life expectancy more than 5 years Men should accept (or female partners of men enrolled in the study who are of childbearing potential or are pregnant) to use an effective contraception during darolutamide treatment and at least one week after the end of the investigational product Signed informed consent Patient able to participate and willing to give informed consent prior performance of any study-related procedures and to comply with the study protocol for the duration of the study, including undergoing treatment and scheduled visits and examinations including follow up Patient affiliated to a Social Health Insurance in France. Exclusion Criteria: Distant metastasis (clinical stage M1). Nodal disease below the iliac bifurcation (clinical stage N1) is not an exclusion. Pathological finding consistent with small cell, ductal or neuroendocrine carcinoma of the prostate Prior treatment for prostate cancer Castrated men (Bilateral orchiectomy or other) History of any pelvic radiation Any of the following concurrent illness within 6 months prior to first dose of study drug: severe or unstable angina, myocardial infarction, symptomatic congestive heart failure, arterial or venous thromboembolic events (eg, pulmonary embolism, cerebrovascular accident including transient ischemic attacks), or clinically significant ventricular arrhythmias or New York Heart Association Class II to IV heart disease; uncomplicated deep vein thrombosis is not considered exclusionary Uncontrolled hypertension as indicated by a systolic blood pressure (BP) ≥ 160 mmHg or diastolic BP ≥ 100 mmHg at screening despite medical management. Participants with hypertension can enroll provided BP is stable and controlled by anti-hypertensive treatment HIV-positive patient with one or more of the following: Not receiving highly active antiretroviral therapy; Had a change in antiretroviral therapy within 6 months of the start of screening; Receiving antiretroviral therapy that may interfere with study drug; CD4 count <350 at screening; AIDS-defining opportunistic infection within 6 months of start of screening Active or symptomatic viral hepatitis or chronic liver disease; ascites or bleeding disorders secondary to hepatic dysfunction Gastrointestinal conditions affecting absorption Known or suspected contraindications or hypersensitivity to darolutamide Treatment with strong CYP3A4 inducers and P-gp inducers within 2 weeks or 5 drug-elimination half-lives, whichever is longer, prior to initiation of study drug Major surgery within 28 days before first dose of study treatment Any psychological, familial, geographic or social situation, according to the judgment of investigator, potentially preventing the provision of informed consent or compliance to study procedure Patient who has forfeited his/her freedom by administrative or legal award or who is under legal protection (curatorship and guardianship, protection of justice) Concurrent enrolment in another interventional therapeutic clinical study.