NANOG and breast cancer: Notably, we assessed the expression correlation between Nanog and CYP4Z1 or CYP4Z2P across basal-like breast cancer subtypes using Breast Cancer Gene-Expression Miner (version 4.0; http://bcgenex.centregauducheau.fr/) and found that Nanog expression is positively correlated with CYP4Z1 or CYP4Z2P expression in basal-like breast cancer subtypes (Additional file 8: Figure S2G and S2H).