Liu et al[49] found that the concentration of IL-4 in cerebrospinal fluid of tuberculous meningitis patients was higher than that of non-tuberculous meningitis patients (59.06 ± 39.82 pg/mL vs 5.07 ± 2.66 pg/mL, P < .05) by comparing 17 patients with tuberculous meningitis to patients with non-tuberculous meningitis. This evidence concerns the gene IL4 and meningeal tuberculosis.