As shown in Figure 2, mRNA expressions of ALDH1A1 and ALDH1B1 significantly decreased in thyroid cancer tissues compared to that in normal groups based on individual cancer stages (Figures 2D–F), gender (Figures 2G–I), tumor histology (Figures 2J–L), and nodal metastasis (Figures 2M–O). Here, ALDH1B1 is linked to thyroid cancer.