Retraction: Wang C, Chen Z, Ge Q, Hu J, Li F, Hu J, Xu H, Ye Z, Li LC (2014) Up-regulation of p21WAF1/CIP1 by miRNAs and its implications in bladder cancer cells. FEBS Letters 588, 4654-4664. https://doi.org/10.1016/j.febslet.2014.10.037. (FEBS letters, 2024)