FAAH and cancer: Fatty acid amide hydrolase (FAAH), a member of the serine hydrolase family of enzymes, was first identified as the principal catabolic enzyme that catalyzes the hydrolysis of endogenous amidated lipids such as N arachidonoylethanolamine (AEA, anandamide), palmitoylethanolamide (PEA), and oleoyl-ethanolamide (OEA), which regulating various metabolic pathways and pathophysiological conditions in the body, such as emotion, cognition, energy balance, pain sensation, neuroinflammation, and cancer cell proliferation [29–31].