In Fig. 2 and Figure S2 a to d, we found that the expression levels of XIST, RELA, CD44, Slug, and ESA were remarkably decreased in the miR-7 mimic transiently transfected cells, especially in the case of XIST, which may regulate the stemness characteristics and tumorigenicity of some types of cancer cells, resulting in cancer progression [28–33]. This evidence concerns the gene CD44 and cancer.