IL1B and aneurysm: Pattern 2 transcripts (325 transcripts) showed increased expression in aneurysms and included many genes associated with inflammation including matrix metalloproteinase encoding genes (e.g. Mmp2), genes encoding markers of inflammatory cells (Cd14, Cd68) and many cytokine and chemokine genes (e.g. Il1b, Il6, Ccl4, Ccl7, Ccl8, Ccl19, MMP2) (Table 4 shows a selected list and Additional File 7 a full list).