MMP9 and non-small cell lung carcinoma: According to our findings, the subject of carrying MMP9 CC and MMP13 GG genotypes showed a significantly increased risk of NSCLC, and the serum levels of MMP9 and MMP13 constitute statistical evidence in support of the notion that MMP13 and MMP9 might function as a key oncogene in NSCLC with Southern Chinese population.