NAMPT, as intracellular and extracellular factor, exerts a direct role on tumor cells increasing tumor aggressiveness, correlating with worse prognosis and regulating different processes including metabolic adaptation, DNA repair, gene expression, signaling pathways, cell growth, invasion, stemness, epithelial to mesenchymal transition program, metastatization, angiogenesis, secretion of both pro-inflammatory and immunosuppressive cytokines, resistance to genotoxic stress, as reviewed in Dalamaga et al. (178) and Audrito et al. (25). Here, NAMPT is linked to neoplasm.