FOXF2 enhances the stemness of luminal breast cancer cells but inhibits that of BLBC cells.A–C, the mRNA and protein levels of FOXF2 in the indicated cells were detected by RT-qPCR and immunoblot. 1st: first-generation mammospheres; 2nd: second-generation mammospheres. D and E, the mRNA (D) and protein (E) expression levels of stem cell–related markers in the indicated cells were detected by RT-qPCR and immunoblot. ∗, p < 0.05 compared with control cells. BLBC, basal-like breast cancers; RT-qPCR, reverse transcription-quantitative PCR.