Lipidomic analysis of these tumor tissues showed a significant increase in the free AA ratio (Supplementary Fig. 2B) as well as in arachidonoyl-phosphatidylcholine (PC) and -phosphatidylethanolamine (PE) per tumor cell (Supplementary Fig. 2C, D) in SLC27A2 mice. The gene discussed is SLC27A2; the disease is neoplasm.