MMP9 and nasopharyngeal carcinoma: In another study, MT at doses of 12.5, 25, 50, 100, and 200 μg/mL, inhibited the migration and invasion of nasopharyngeal carcinoma cells (NPC-039 and CNE-2Z) through suppression of the expression of NF-κB and down-regulation of downstream matrix metalloproteinase-2 and metalloproteinase-9 (MMP-2 and MMP-9) proteins (Sun and Min, 2015).