NANOG and breast cancer: In breast cancer, hypoxia induces demethylation of m6A, mainly HIF-1α and HIF-2α, which is highly expressed under hypoxia, can activate the gene transcription of ALKBH5, reduce NANOG m6A methylation and stabilize its stability, increase its protein expression, and promote the phenotype of breast cancer stem cells [63] (Supplementary Table 2).