The statement of which three cancers are the best to treat is slightly unscientific, but the prognosis is better for cancers with earlier stage and better differentiation after treatment. Cancer is a common malignant disease, mostly caused by heredity, environment and gene mutation. If the cancer is diagnosed at an early stage and the lesions are limited, radical surgery and other treatments are feasible and the prognosis is relatively good. If the cancer is already in the middle or late stage at the time of diagnosis, and the opportunity of radical surgery or radiotherapy is lost, the survival period will be significantly shortened, and the prognosis will be poorer. In addition, patients with better pathologic staging and low malignancy have a relatively better prognosis. Early to mid-stage papillary thyroid cancer can achieve a ten-year survival rate of about 85% or more after treatment; slower-developing inert lymphomas, such as follicular lymphoma and small lymphocytic lymphoma, generally have less impact on life expectancy. However, there is no such thing as which three types of cancer are the best to treat. Cancer treatment emphasizes on prevention, and early detection, early diagnosis and early treatment are fundamental. Early detection, early diagnosis and early treatment are fundamental. There is no such thing as which three types of cancer are the best to treat. If cancer is diagnosed, it is recommended to consult a doctor in time and cooperate with the doctor for active treatment, so as to avoid delaying the condition.