SLC7A11 and ovarian cancer: SLC7A11 and GPX4 were then selected for validation using western blotting and RT‐qPCR analyses in two cell lines (human ovarian cancer cells A2780, SKOV3 and their respective platinum‐resistant cells subline A2780/CisR, SKOV3/CisR) to confirm further the alterations in protein expression revealed by immunohistochemical analyses.