On the other hand, TGF-β1 reportedly reduces GLUT1 mRNA and protein expression in murine thymic-derived Treg cells (Chen et al., 2020; Priyadharshini et al., 2018), and mammary epithelial cells (Nilchian et al., 2020), as well as human breast cancer (Nilchian et al., 2020) and glioblastoma (Rodríguez-García et al., 2017) cell lines. This evidence concerns the gene SLC2A1 and glioblastoma.