MBTPS1 and colonic neoplasm: SPL is responsible for irreversible degradation of S1P, as described in the Introduction section, therefore, SPL may regulate not only the intracellular levels of S1P, but also the amount of S1P available for extracellular export, by influencing autocrine or paracrine signaling through extracellular S1P receptors, especially in colon cancer, in which the S1P release system is up‐regulated.21