The aims of the study were: (i) the measurement of neutrophil mediators and inflammatory cytokines, NGAL, MPO, neutrophil elastase, TNF-a, and IL-6 in tissues taken from thick and thin segments of intraluminal thrombus and adjacent AAA walls; (ii) the determination of corresponding plasma/serum levels in the patients and in a control group; and (iii) the evaluation of possible associations between measured parameters. This evidence concerns the gene MPO and triple-A syndrome.