GSTM1 and anemia: Patients with mutations of Cd 41/42 (-TTCT) (β0), IVS 1-5 (G>C) (β+), and Cd 17 (A>T) (β0) showed mild anaemia (Hb 98 g/dL) with significantly lower serum ferritin and serum iron levels compared to patients with other mutations in the present study (Table 6 and Table 7).