MMP9 and neoplasm: Then, OSCC patient-derived stromal cell xenografts (PDSXs) by co-transplanting the stromal cells isolated from patients with different OSCC subtypes: SCC and VSCC with OSCC cell line (HSC-2) to the BMT nude mice, and we evaluated the infiltration of BMDCs and the expression of MMP9 and MMP2 in the invasion front line of the tumor.