Differences in expression of Ki-67 were observed between PTC and FTC on the one hand (median Ki-67 index of 6.2 and 5.7, respectively) and MTC and ATC on the other (median Ki-67 index of 20.7 and 36.9, respectively) (Fig. 4A). Here, MKI67 is linked to thyroid cancer, nonmedullary, 2.