In addition, triptolide-induced metastasis is shown to be through MMP-2 and MMP-9 down-regulation in human neuroblastoma SH-SY5Y cells, via decreased MMP-3 and MMP-9 expressions in T-cell lymphoblastic lymphoma cells, and through MMP-2, MMP-7 and MMP-9 down-regulation in human prostate cancer PC-3 and DU-145 cells [417, 423, 433]. This evidence concerns the gene MMP9 and neuroblastoma.