A comparison of the group of patients with glioma and the control group also allowed for the confirmation of statistically significant differences for such exogenous amino acids such as THR (p = 0.005100), MET (p = 0.000003), LYS (p = 0.000019), AAA (p = 0.007040), PHE (p = 0.007552), C-C (p = 0.000000), and TYR (p = 0.000349). Here, TYR is linked to glioma.