In 1 of these studies, 43 (64.2%) of 67 samples were positive for HCMV IgG/IgM [70]; the other study reported only 2 pediatric GBM patients (among 21 patients with other brain tumors) and found HCMV IgG/IgM in both [88] (Table 9). Here, CD40LG is linked to glioblastoma.