Fig. 1

The activities of thyroid function indexes and PD-1. A. The plasma activities of the T3, T4, FT3, FT4, TSH among PTC, NG and HP groups. B. The plasma activities of the TGAb and TPO among PTC, NG and HP groups. C. The activities of the CD3⁺PD-1⁺, CD3⁺CD4⁺PD-1⁺ and CD3 + CD8 + PD-1+ among PTC, NG and HP groups (*P < 0.05), P < 0.05 represents a significant difference.