GPX4 and ovarian cancer: The results from qRT-PCR and Western blot assays showed that both the mRNA level and protein expression of SNAI2, SLC7A11 and GPX4 in SKOV3, A2780 and CAOV3 cells were higher than that in IOSE-80 (Figure 1a-d), suggesting that SNAI2, SLC7A11 and GPX4 were upregulated in ovarian cancer.