PPM1D promotes the cell migration and invasiveness of thyroid cancer cells in vitro. (A) Cell migration was quantified by wound healing assay. Cells were imaged immediately (0 h) and 48 h after scratches were created to assess the percentage of the wound-healed area. Representative images at different time-points are provided on the left (scale bar, 100 µm) and quantitative measurements are displayed on the right. (B and C) Cell invasion was assessed using a Transwell invasion assay. (B) Representative imagines (scale bar, 100 µm) and (C) Quantitative measurements. Values are expressed as the mean ± SEM of three independent experiments. P-values were determined using ANOVA test followed by Tukey's test. ***P<0.001. PPM1D, protein phosphatase, Mg2+/Mn2+ dependent, 1D.