The mean values of AST (19.5 ± 8.6 UI/L), ALT (7.6 ± 3.2 UI/L), and GGT (20.4 ± 16.8 UI/L) before anti-TB therapy were not different (ANOVA, P > 0.05) from those observed at the end of the continuation phase (AST = 19.4 ± 8.5 UI/L; ALT = 7.5 ± 3.5 UI/L; GGT = 20.3 ± 16.8 UI/L), at day 15 after the end of the continuation phase (AST = 19.2 ± 5.8 UI/L; ALT = 9.3 ± 4 UI/L; GGT = 19.7 ± 12.1 UI/L), and at day 45 after the end continuation phase (AST = 19.5 ± 7.3 UI/L; ALT = 11.6 ± 4.7 UI/L; GGT = 21.6 ± 17.7 UI/L). This evidence concerns the gene GPT and tuberculosis.