SIRT1 and central nervous system cancer: Procyanidin exhibited neuroprotective activity by its capacity to regulate the secretion of S100 via the regulation of SIRT1 and the suppression of TNF-γ, NF-kB p65 (RelA subunit of NF-κB family of transcription factors) and B-cell lymphoma 2 (Bcl-2) on glioma cells (Jiao et al., 2013).