HDAC9 and breast cancer: To determine the correlation between HDAC, mTORC1, and ESR1 in TNBC patients, we analyzed normal mammary tissue, TNBC, and luminal breast cancers (ESR1 positive), using samples from 55 TNBC, 59 luminal A/B breast cancer, and 11 normal breast tissues (gene omnibus2R platform, Dataset: GSE65216, Accessed November 1, 201739–43).