Abstract：The incidence of thyroid cancer is increasing year by year in the world, and it shows the same trend in China, with papillary thyroid carcinoma as the main clinicopathological type. Thyroid cancer only accounts for 2% of systemic malignant tumors, and the prognosis is well. The patients are younger and its incidence has continuously increased in recent years; thus it has received wide attention by the society and medical staff. The causes of thyroid cancer are not clearly defined at present.Clinical researches and epidemiological investigations indicate that certain factors are closely related to thyroid cancer. For example, its growth rate shows significant differences in different regions, race, gender, occupation, etc. In addition, abnormal iodine intake, BRAF gene mutation, complication with other thyroid diseases and other factors may also promote the occurrence of thyroid cancer. The cause and mechanism of thyroid cancer remain to be further studied.
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2018, Vol. 25 
