Clinico-biological Database in Patients Treated With Metabolic Radiotherapy in the Nuclear Medicine Department

This study is creating a database of patients who receive a type of treatment called metabolic radiotherapy (radioactive medicines that target cancer cells) to better understand how it works and track outcomes over time. **You may be eligible if...** - You are 18 years old or older - You are being treated with metabolic radiotherapy for thyroid cancer, a neuroendocrine tumour, or prostate cancer - You agree to provide an additional blood sample **You may NOT be eligible if...** - You are pregnant or breastfeeding - You are in an emergency medical situation - You are under legal guardianship that prevents you from consenting - Regular follow-up visits are not possible for you (due to location, personal circumstances, etc.) Talk to your doctor to see if this trial is right for you.