Cytokine profiles in papillary thyroid carcinoma, with or without Hashimoto’s thyroiditis:

The phenomenon that papillary thyroid carcinoma (PTC) is often accompanied by Hashimoto's thyroiditis (HT) raised interest in further study of immune changes caused by thyroid autoimmunity. We aimed to characterize cytokine profiles in the peripheral blood of patients with PTC with or without HT, compared with nodular goiter (NG) and healthy control (HC) patients, in order to determine the autoimmunity-related differences among these groups. A total of 50 PTC patients were divided into two groups, according to whether or not concurrent HT existed. A total of 20 NG patients and 20 HC subjects were also included as controls. All PTC patients and NG patients who underwent surgical thyroidectomy and pathology examination were included. The serum levels of four cytokines, including interferon gamma (IFN-gamma), interleukin (IL)-17, IL-10, and IL-35 were measured using AimPlex bead-based immunoassays. Peripheral IFN-gamma and IL-35 increased significantly in PTC patients with concurrent HT. IL-10 and IL-35 increased significantly in three groups (PTC with or without HT and NG patients), while IFN-gamma increased only in the two PTC groups. IL-17 was highest in the HC group, but significantly lower in the other three groups. IL-17, IL-10, and IL-35 may be involved in tumor onset and progression. Moreover, IFN-gamma and IL-35 may play vital roles in the concurrence of PTC and HT, which could warrant further exploration.