Ten glioma samples (5 IDH1 wildtype and 5 IDH1 mutant) were stained for various HDAC genes using internally validated antibodies (HDAC1, HDAC2, HDAC3, HDAC4, HDAC5, HDAC6 and HDAC7) and scored by a blinded neuropathologist (AK). The gene discussed is HDAC4; the disease is glioma.