Lipoprotein-associated phospholipase A, also known as platelet activating factor acetylhydrolase (PAF-AH) or phospholipase A group 7, hydrolyzes glycerophospholipids to produce lyso-PAF/lyso-phosphatidylcholine and short and/or oxidized fatty acids, many of which have pro-inflammatory or pro-oxidative activities. PAF-AH1b2 and 1b3 form a complex with 1b1 to regulate brain development, spermatogenesis, and cancer pathogenesis. P11 is an inhibitor of PAF-AH1b2- and 1b3-mediated hydrolysis of PAF to lyso-PAF (ICs = 37 and 880 nM, respectively) without significant effect on other brain serine hydrolases. At 10 µM, it has been shown to impair Neuro2a and PC3 tumor cell survival.