MMP9 and glioma: Importantly, in human glioma microarray specimens (n = 85, N095Ct01, Bioaitech), we found a positive correlation between L1 and MMP2/9 staining intensities in the glioma specimens (Fig. 2K–M), thus supporting the notion that MMP2 and MMP9 are involved in L1‐mediated glioma invasion.