Six cancer types, including PRAD (n = 15), BRCA (n = 13), THCA (n = 12), BLCA (n = 11), KIRC (n = 11), GBM (n = 10), and KIRP (n = 10), showed the highest correlation between COL5A1 expression and levels of infiltrating TIIC, and the results are presented in Table 2. Here, COL5A1 is linked to glioblastoma.