INVESTIGATION OF METFORMIN IN PATIENTS WITH CASTRATION RESISTANT PROSTATE CANCER IN COMBINATION WITH ENZALUTAMIDE VS. ENZALUTAMIDE ALONE, A RANDOMIZED, OPEN LABEL, PHASE II TRIAL “Etude SAKK 08/14” Sponsor : SAKK CONTACTS AUX HUG : Unité de recherche en Onco-Hématologie, Fondation DFDL Coordinatrice de l’étude : Mme Delphine Gani, 079 553 24 26 Investigateur responsable: Dr Anna Patrikidou, 079 553 60 99 Secrétariat: Mme Florence Marti-Klay, 022 372 29 01 DESIGN DE L’ETUDE Environ 168 patients seront recrutés dans 15 sites et seront randomisés 1:1 dans l’un des deux bras de traitement selon le schéma suivant : mCRPC patients with: Stratification factors: - Progressive disease under ADT - BMI Enzalutamide 160 mg QD + Metformin 850 mg BID until PD - Site of metastasis - Treatment Continued androgendeprivation - WHO performance status Arm B : Enzalutamide 160 mg QD until PD OBJECTIF DE L’ETUDE Evaluer l’efficacité de la combinaison Enzalutamide + Metformin, comparée à l’Enzalutamide seul chez des patients ayant un cancer résistant à la castration et progressant sous ADT. Etude SAKK 08/14, V2.0, 20.06.16 dngn 21.12.2015 Life long Follow-up Arm A : CRITERES D’ELIGIBILITE # 1 2 3 4 5 6 INCLUSION CRITERIA Written informed consent according to ICH/GCP regulations before registration and prior to any trial-related investigations Histologically or cytological confirmed adenocarcinoma of the prostate without small cell features Asymptomatic or minimally symptomatic patients in relation to disease Metastatic adenocarcinoma of the prostate documented by imaging (CT/MRI and/or bone scan) Ongoing androgen deprivation therapy with GnRH analogues or bilateral orchiectomy (i.e. surgical or medical castration) Total testosterone levels ≤ 1.7 nmol/L (corresponding to ≤ 50 ng/dL) Tumor progression at the time of registration, defined as one or more of the following three criteria that occurred while the patient was on androgen deprivation therapy as defined in point 6.1.5: 7 8 9 10 11 12 13 14 15 16 YES PSA progression defined by a minimum of two rising PSA levels and an absolute increase in total ≥ 2 ng/mL with an interval of ≥ 1 week between each determination. Patients treated with an anti-androgen must have PSA progression after withdrawal of previous treatment with e.g. flutamide, bicalutamide, nilutamide or cyproteronacetate (≥ 6 weeks since last dose) Soft tissue disease progression defined by RECIST 1.1 Bone disease progression defined by PCWG2 with two or more new lesions on bone scan Completed baseline QoL and pain questionnaires Male patients ≥ 18 years WHO performance status 0-2 Adequate hematologic values: hemoglobin ≥ 90 g/L, neutrophils ≥ 1.0 x 10 9/L, platelets ≥ 75 x 109/L Adequate hepatic function: ALT and AST ≤ 2.5 x ULN, bilirubin ≤ 1.5 x ULN (exception if Gilbert’s syndrome ≤ 2.5 x ULN) Adequate renal function: calculated creatinine clearance ≥ 50 mL/min, according to the formula of Cockcroft-Gault Patient is able to swallow the trial drugs and comply with trial requirements Patient agrees not to father a child during participation in the trial and during 3 months thereafter Patient agrees to participate in the 3 mandatory translational research projects on blood samples, excepted the pyruvate dehydrogenase substudy Etude SAKK 08/14, V2.0, 20.06.16 dngn 21.12.2015 NO # 1 2 EXCLUSION CRITERIA Known or suspected CNS metastases or active leptomeningeal disease Previous malignancy within 2 years prior to registration, with the exception of localized non-melanoma skin cancer and Ta and Tis bladder cancer Prior treatment for prostate cancer with 3 4 5 7 8 9 10 11 12 13 14 15 16 17 novel endocrine agents (including abiraterone acetate, enzalutamide, TAK-700, TAK-683, TAK-448, VT464, ODM201, ARN509), radioisotopes, TKI and other small molecules, immunotherapy or chemotherapy (with the exception of docetaxel chemotherapy in hormone sensitive prostate cancer) Treatment with experimental drugs or treatment within a clinical trial within 30 days prior to registration (except the clinical trial SAKK 96/12 and/or the biobank project SAKK 63/12) Clinically significant cardiovascular disease including: 6 YES Myocardial infarction within 6 months prior to registration, Uncontrolled angina within 3 months prior to registration, Congestive heart failure NYHA class III or IV QTc interval > 480 ms, History of clinically significant ventricular arrhythmias (e.g. ventricular tachycardia, ventricular fibrillation, torsades de pointes), History of Mobitz II second or third degree heart block without a permanent pacemaker in place, Uncontrolled hypertension as indicated by systolic blood pressure > 170 mmHg or diastolic blood pressure > 105 mmHg Severe concurrent disease, infection, or co-morbidity that, in the judgment of the investigator, would make the patient inappropriate for enrollment (e.g. uncontrolled or acute severe infection, advanced chronic obstructive pulmonary disease, heart failure) Known history of HIV, hepatitis B, hepatitis C Major surgery within 4 weeks prior to registration Gastrointestinal disorder affecting absorption (e.g., gastrectomy, active peptic ulcer disease within 3 months prior to registration) Treatment with metformin within the last 6 months prior to registration Patients on pharmacotherapy for diabetes mellitus History of diabetic ketoacidosis, diabetic coma and pre-coma Known history of seizures or any conditions that may predispose to seizure. History of loss of consciousness or transient ischemic attack within 12 months prior to registration Concurrent anticoagulation with rivaroxaban or warfarin Known hypersensitivity to the IMPs or hypersensitivity to any of their components Any concomitant drugs contraindicated for use with the IMPs according to the Swissmedic approved product information Any psychological, familial, sociological or geographical condition potentially hampering compliance with the trial protocol and follow-up Etude SAKK 08/14, V2.0, 20.06.16 dngn 21.12.2015 NO