IL-34 protein expression in the thyroid tissue of the HT group was significantly lower than that of the non-HT group (Figure 3A), Similarly, IL-34 mRNA expression in the thyroid tissue of the HT group was significantly lower than that of the non-HT group (Figure 3B) and a negative correlation was observed between the mRNA expression of IL-34 and both TPOAb (r = −0.368, p = 0.015) and TgAb (r = −0.356, p = 0.019) (Figure 3C). This evidence concerns the gene IL34 and hematocrit.