FAAH and neoplasm: In addition, it has been proposed that free fatty acids produced from the corresponding 2-acylglycerols (including 2-arachidonoylglycerol) by the action of monoacylglycerol lipase may be involved in the pathogenesis of several tumour types [54], and it can be argued that FAAH may also play this role in the generation of free fatty acids from the corresponding N-acylethanolamines (including anandamide).