SFXN2 and breast cancer: Moreover, as shown in Figure 5b, four negative regulatory miRNA–SFXN2 pairs were significantly associated with poor prognosis for BC patients and miRNAs negatively regulated SFXN2, namely, has-miR-9-5p (HR = 1.67, P = 0.0019), has-miR-34a-5p (HR = 1.53, P = 0.0092), has-miR-532-5p (HR = 1.39, P = 0.044), and has-miR-885-5p (HR = 1.48, P = 0.029).