Nevertheless, the gender (X2 = 0.030, p = 0.863), age (X2 = 0.378, p = 0.984), GSTM1 (X2 = 0.196, p = 0.658), and plasma level of AST (X2 = 3.730, p = 0.155) have no relationship with the clinical response of TB patients receiving INH therapy. This evidence concerns the gene GSTM1 and tuberculosis.