For example, in breast cancer, the LINC00908-encoded polypeptide ASRPS (a small regulatory peptide of STAT3) (62), the lncRNA MAGI2-AS3-encoded polypeptide (63), and the lncRNA HCP5-encoded peptide (64) have been proven to have functional roles in breast cancer pathogenesis (Figure 1G). Here, MAGI2 is linked to breast cancer.