LINC00355 acts as a competing endogenous RNA by sponging miR-34b-5p, whose target mRNA is ABCB1, to prevent it from binding to ABCB1 mRNA and upregulate ABCB1 expression; this causes BC cell proliferation as well as the inhibition of BC cell apoptosis (Fig. 1B) [32]. Here, ABCB1 is linked to breast cancer.