Another phase III, randomized, double-blind clinical trial in TBM patients is conducted in Vietnam to determine whether the Leukotriene A4 hydrolase (LTA4H) genotype defined the efficacy of dexamethasone in HIV-uninfected TBM patients (ClinicalTrials.gov Identifier: NCT03100786). The gene discussed is LTA4H; the disease is meningeal tuberculosis.