In the same context, Ahn et al. [29] examined the anti-proliferative effect of psammaplin A as a HDAC suppressor, measured levels of acetylated histone protein and HDAC protein, and finally assessed the pivotal role of psammaplin A on apoptosis, cell cycle arrest, and expression of tumor inhibitor genes in the human endometrial Ishikawa cancer cell line. This evidence concerns the gene HDAC9 and neoplasm.