In the original publication [ 1], there were overlaps in Figures 1D and 5A as published. In the first row of Figure 1D, images 3 and 4 were not correct; therefore, they have been replaced. In the first row of Figure 5A, image 3 as well as the third row in image 2 are not correct; therefore, they have also been replaced. In contrast to migration, invasion, and colony formation assays, spheroids in the spheroid formation assay tend to form with aggregation in center area of the low-attachment 24-well plate. In some cases, the number of spheroids is limited or too large. Therefore, in order to quantify this, image acquisition with some overlapping areas is inevitable. And this is the reason for the overlapping images. The corrected Figures 1D and 5A appear below.