In contrast, MMP1 expression was significantly and negatively related to TMB in BLCA (r=-0.13, p=8.4e-3), GBM (r=-0.18, p=3.0e-2), HNSC (r=-0.14, p=1.3e-3) and KIRP (r=-0.14, p=2.8e-2) (Figure 6A). Here, MMP1 is linked to glioblastoma.