SLC7A11 and breast cancer: Interestingly, in xenograft model, Polyphyllin III, a major saponin extracted from Paris polyphylla rhizomes, which induces Kruppel Like Factor 4-mediated protective upregulation of SLC7A11, in combination with the System Xc− inhibitor SAS, may have a co-induction in MDA-MB-231 breast cancer cells by enhancing intracellular lipid peroxidation and ferroptosis (Zhou Y. et al., 2021).