MMP9 and non-small cell lung carcinoma: To investigate the role of the functional gene polymorphisms MMP9 -1562C/T (rs3918242) and MMP13 -77A/G (rs2252070) in the pathogenesis of certain diseases, we aim to evaluate the serum levels and polymorphisms of MMP-9 and MMP-13 in non-small cell lung cancer patients compared to normal subjects and their correlation to NCLC histopathology findings in Southern Chinese people.