The results showed that MMP-9 was mainly enriched in immune-related pathways in KIRC, such as immune response regulating cell surface receptor signaling and regulation of immune effector process (Figure 9(c)), and in pathways related to gene silencing and RNA modification in ACC and DLBC (Figures 9(a) and 9(b)). Here, MMP9 is linked to adrenal cortex carcinoma.