HDAC6 and oral cavity squamous cell carcinoma: HDAC6 expression is upregulated in low-grade and high-grade ovarian cancers [8,28,29], oral squamous cell carcinoma [30], hepatocellular carcinoma [31], and acute myeloid leukaemia (AML) [32] and is associated with increased chemotherapy resistance in acute lymphoblastic leukaemia [33].