There is no clear time for how long thyroid cancer can survive with radiotherapy, the five-year survival rate of early-stage patients is more than 90%, while that of late-stage patients is only 60%. Radiotherapy is only one of the many treatments for thyroid cancer, it can be used as an adjuvant treatment or as the main treatment, so there is no way to determine the specific survival time through radiotherapy, only that the five-year survival rate of early thyroid cancer is about 90%, and that of late-stage is about 60%. Generally speaking, the first choice of treatment for early thyroid cancer is surgery, and radiotherapy is mostly an auxiliary means, after which most patients can be cured, and it does not even affect normal life expectancy; while advanced thyroid cancer requires comprehensive treatment such as radiotherapy and chemotherapy to prolong its survival period.