CYCS and nasopharyngeal carcinoma: Moreover, MAPK-driven cytoplasmic accumulation and phosphorylation of hnRNP K induces expression of thymidine phosphorylase (platelet-derived endothelial cell growth factor, PD-ECGF/TP), an inhibitor of caspase 3 and 9 activation and mitochondrial cytochrome c release, in nasopharyngeal carcinoma cells [9, 37].