HDAC9 and neoplasm: The autophagy-dependent alteration in tumor cell immunogenicity biomarkers in vitro was directly associated to the ability of autophagy to also degrade and reduce the expression of HDAC proteins, which impacted on transcription, e.g. HDACs 1 and 3, as well as on protein stability/activity, e.g. HDAC6 [1, 2, 4–6].