FOXO3 and breast cancer: For example, circ_0071196 facilitates BC cell proliferative and migrative abilities via tuning miR-19b-3p/CIT axis [3]; circRNA FOXO3 inhibits BC progression via regulating miR-9-5p/TGFBR2 axis [4]; circ_0061140 boosts BC metastasis via targeting miR-1236 [5].