HDAC1 and neoplasm: Chidamide, functioning as an epigenetic modulator, selectively inhibits the activity of HDAC1, 2, 3, and 10, and performs its antitumor action via multiple mechanisms including inhibiting tumor cell cycles, inducing tumor cell apoptosis, and enhancing natural killer cells and antigen‐specific cytotoxic T cells‐mediated tumor killing.28