GSTM1 and tuberculosis: On 2nd week of anti-TB therapy, his clinical condition, haematological and biochemical parameters improved (Hb 12.1 gm/dL, total white cell counts 5430/cmm, ALT 87 U/L, AST 80 U/L, alkaline phosphatase 540 U/L) and we could switch him to standard anti-TB drugs and prednisolone was discontinued.