Single nucleotide polymorphisms (SNPs) in two 5-LO pathway genes; 5-lipoxygenase activating protein (ALOX5AP) and leukotriene A4 hydrolase (LTA4H) have shown an association with LTB4 overproduction from ionomycin-stimulated neutrophils and with myocardial infarction (MI) susceptibility [11,12]. This evidence concerns the gene LTA4H and myocardial infarction.