A study in mice demonstrated that the mir-521 was significantly changed in prostate cancer cells in response to ionizing radiation, where it sensitizes cells by regulating the DNA repair protein CSA [Lu et al. DOI:10.1002/cbin.10627]. A study in prostate cancer cells demonstrated that inhibition of the mir-521 confers radioresistance by targeting the DNA repair protein CSA [May et al. DOI:10.1016/j.trsl.2021.02.005].