Looking at Figure 4A, it is apparent that the immune scores of ACC, CESC, GBM, HNSC, KIRC, KIRP, LGG, LUAD, LUSC, TGCT and UCEC were negatively associated with KRAS expression; from Figure 4B above we can see that the stromal scores in THCA showed a causal negative relationship with KRAS expression levels, and GBM, LGG, LUSC, TGCT and UECE showed a causal negative relationship with KRAS expression levels. This evidence concerns the gene KRAS and glioblastoma.