SFXN1 and breast cancer: The miRNAs regulating SFXN1 (has-miR-22-3p, has-miR-140-5p, has-miR-532-5p, and has-miR-582-3p regulating SFXN1) and SFXN2 (has-miR-9-5p, has-miR-34a-5p, has-miR-532-5p, and has-miR-885-5p regulating SFXN2) could be involved in carcinogenesis and influencing the prognosis of BC patients.