Prostate Cancer Clinical Trial
Official title:
Individualisation of Management With Novel Upfront Therapies in Newly Diagnosed Metastasized Prostate Cancer Using (PSMA)PET/CT Imaging - Enzalutamide
PSMA-PET/CT response measurements after LHRH agonist and upfront enzalutamide therapy in men diagnosed with de novo metastasized hormonal sensitive prostate cancer.
Rationale: Men, newly diagnosed with metastasized prostate cancer on PSMA PET/CT, who start on standard hormonal therapy, are additionally treated with either upfront chemotherapy or upfront extra androgen-receptor targeted agents ('ARTA'), as per guidelines' recommendations. The benefit in overall survival of these two options is similar, but important differences exist in patient-specific efficacy, costs, side-effects, and impact on quality of life. No predictive factors are available to individualize treatment choice. Currently, a one-size-fits-all strategy with hormonal therapy plus chemotherapy is usually followed. Objective: To assess the predictive value of early response measurements on PSMA-PET/CT for therapy success, defined as time to development of castration-resistant prostate cancer (CRPC), in order to personalize treatment choice. Study design: Prospective, single arm, open label, non-interventional, non-therapeutic observational cohort study. Study population: Patients >18 years with newly diagnosed, histologically proven prostate cancer with >3 skeletal or visceral metastatic lesions on the PSMA-PET/CT, who are considered eligible for upfront therapy (enzalutamide) in addition to standard hormonal therapy. Main study parameters/endpoints: Primary parameter: Predictive value of early response on PSMA-PET/CT to upfront therapy, according to PERCIST criteria. Primary endpoint: Time to development of CRPC. Secondary parameters: Predictive value of early response on PSMA-PET/CT to hormonal therapy; predictive value of baseline PSMA-PET/CT, analysis of response in different subgroups of patients: e.g. high versus low tumour load, high versus low PSA, high versus low Gleason score. Secondary endpoint: Time to initiation of second line therapy after castration-resistant disease has been found. Nature and extent of the burden and risks associated with participation, benefit, and group relatedness: Patients will be treated according to standard of care, including baseline PSMA-PET/CT. The timing of follow-up PSMA-PET/CT imaging will be standardized. Instead of imaging at biochemical or clinical signs of disease progression, one PSMA-PET/CT will be performed after two months of hormonal therapy, one PSMA-PET/CT will be performed after two months of upfront therapy. Each PSMA-PET/CT scan will require an extra visit (2-3 hours) and a limited radiation burden after intravenous injection of PSMA. The additional information from the standardized follow-up PSMA-PET/CT scans will not be used for clinical decision-making. ;
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