The prognosis and curability of medullary thyroid cancer (MTC) depend on various factors, including the stage of the cancer at diagnosis, the presence of metastasis, and the individual's response to treatment. Early-stage MTC that is localized to the thyroid gland has a higher chance of cure. Surgery is the primary treatment for MTC, and additional treatments, such as radioactive iodine therapy or targeted therapies, may be recommended depending on the individual case. However, advanced or metastatic MTC can be more challenging to cure, and treatment focuses on controlling the progression of the disease and managing symptoms. It's important for individuals with MTC to work closely with a healthcare team to develop an appropriate treatment plan and discuss prognosis based on their specific circumstances.