MMP2 and lung carcinoma: The objective of this study was to re-examine polymorphisms in the genes encoding the gelatinases MMP-2 and MMP-9 at positions -735C/T (rs2285053) and -1562C/T (rs3918242), respectively, and their potential effects on lung cancer, with our rationale for conducting this research being that our understanding of lung cancer has improved over the last decade.