ABSTRACT
Hashimoto thyroiditis (HT) is the most common autoimmune disease of the thyroid. The thyroid peroxidase antibody (TPOAb) and thyroglobulin antibody (TGAb) always increase greatly in the patients. Thyroid cancer is the most common malignant tumor in the endocrine system. And papillary thyroid carcinoma (PTC) is the most common pathological type of it. Recently, the coexistence of HT and PTC has shown an increased incidence. And these two diseases have many similarity in immunology, endocrine, genetics, implying the links between them. However the underlying mechinisms remain unclear. On the ground of the characteristics of epidemiology and histopathology, this article reviews and summarizes possible mechanism in many ways for the coexistence of these two disease, including precancerous lesion, cell proliferation and apoptosis disorder, immunology, endocrinology, genetics, etc.