Transmissible spongiform encephalopathies (TSE) or prion diseases are a group of fatal neurodegenerative diseases that affects humans and animals. The characteristic feature of prion diseases is conversion of normal cellular prion (PrPc) to the abnormal pathogenic scrapie isoform (PrPsc) through a still undefined mechanism, which eventually results in the extracellular accumulation of PrPsc aggregates. Studies were shown that cellular prion protein is present in cancer cell lines and may protect cells from pro-apoptotic agent or sensitizes cells to apoptotic stimulus. Therefore, the main...