ABCB10 and breast cancer: The antisense strand of Circ-ABCB10 undergoes back-splicing of the 5′ and 3′ ends to form circular RNA (Figure 1) With specific expression in different developmental stages and tissues, Circ-ABCB10 was first reported to promote breast cancer proliferation and migration by sponging miR-1271 (Chen et al., 2019).