MMP9 and chronic obstructive pulmonary disease: Besides the reported correlation between some MMP-9 SNPs and cancer metastasis, aneurysm formation and atherosclerosis in coronary arteries and also their possible involvement in COPD and asthma have been postulated (Ganter et al. 2005; Holla et al. 2000; Pinto et al. 2010; Tesfaigzi et al. 2006).