CircABCC4 knockdown inhibited cell migration besides invasion of breast cancer cells by promoting miR-154-5p. (ab) The cell migration also cell invasion of breast cancer cell lines were detected by Transwell chamber assay. CTRL, control; si, small interfering; NC, Negative control; miR, microRNA (n = 25). ANOVA remained responsible for P-values, * P < 0.05 and ** P < 0.01 were considered as significant results