It has been demonstrated that CTX - a peptide from L. quinquestriatus scorpion venom - has an anti-invasive effect on cultured human glioma (D54-MG and CCF-STTG-1) cells, mainly due to the specific and selective interaction of this peptide with MMP-2 isoforms, but not with the MMP-1, -3, and -9 isoforms that are also expressed in glioma cells [48]. The gene discussed is MMP2; the disease is central nervous system cancer.