B2M and breast cancer: In our findings, miR-335-5p was able to bind the 3’-UTR of B2M, and we found that knockdown circ_0058063 down-regulated the expression of B2M by sponging miR-335-5p, suggesting that the circ_0058063/miR-335-5p axis might exert their regulating effects on CDDP-resistance in BC through targeting B2M.