“…Of note, HDACi can impair genetic stability by epigenetic mechanisms and by affecting the acetylation of proteins that are involved in the regulation of DNA repair and the DNA damage response (DDR), such as X-ray repair cross-complementing protein 6 (Ku-70), Ataxia telangiectasia mutated kinase (ATM), checkpoint kinases (Chk1,2), the nuclear protein kinase WEE1, the tumor suppressor p53, the DNA mismatch repair protein MSH2, and breast cancer-associated proteins (BRCA) [ 1 , 24 , 25 , 26 , 27 , 28 ]. By interfering with mechanisms of DDR and DNA repair, including the repair of broken replication forks [ 29 ], HDACi increase the anticancer efficacy of various conventional (i.e., genotoxic) anticancer drugs and radiation [ 25 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Hence, HDACi are suggested as particular powerful anticancer drugs, especially if used in combination treatment regimen [ 22 , 36 , 38 , 39 ].…”