Furthermore, in the tumorigenic MDA-MB-231 basal-like breast cancer cell line, CD90 was used to identify a highly proliferative and migratory subpopulation of CD105+/CD90+ cells with “mesenchymal stem cell-like” characteristics, which were described as offering the possibility of a new theoretical basis for breast cancer recurrence and metastasis [12]. This evidence concerns the gene THY1 and breast cancer.