We next immunostained for HDAC9 and found that HDAC9 was qualitatively overexpressed in Rhabdoid tumors (Figure 5B) compared to the HDAC9-positive non-small cell lung tumor (positive control: Figure 5C) and the HDAC9-negative (negative control: Figure 5D) lung tumor. This evidence concerns the gene HDAC9 and rhabdoid tumor.