S100P and neoplasm: These discordant effects may be caused by S100P crosstalk with diverse pathways in different tumor types, including activation of the MAPK/ERK, PI3K/AKT and NFkB signaling mediated by the binding of the extracellular S100P to RAGE receptor [10] and, based on the analogy with other S100 proteins, activation of apoptosis-related pathways driven by the JNK stress kinase and/or p53 tumor suppressor protein [1].