COL1A2 and glioblastoma: Our findings demonstrated that COL1A2 and SAMD9 expression was positively associated with high APC infiltration, especially DCs, in GBM (COL1A2, r = 0.392; SAMD9, r = 0.302) and LGG (COL1A2, r = 0.297; SAMD9, r = 0.571) (Figure 3).