Furthermore, overexpression of Sirtuin 1 deacetylase (SIRT1), part of the HDAC family, regulates the acetylation of numerous transcription factors, including P53, Ku70, and FOXO1, contributing to drug resistance and survival of CML LSCs by increasing the acquisition of genetic mutations [142]. Here, HDAC9 is linked to chronic myelogenous leukemia, BCR-ABL1 positive.