The expression of TGAb, TPO, CD3+PD-1+, CD3+CD4+PD-1+ and CD3+CD8+PD-1+ was significantly higher in the PTC&HT group than in the PTC&noHT group (p < 0.05) (Table 2, Fig. 2, Fig. 3). The gene discussed is TPO; the disease is hematocrit.