GSTM1 and anemia (phenotype): With regard to the anemia, 40.48% patients were not anemic (Hb > 12 g L−1), while 35.72% (15/42) had moderate anemia (10 < Hb < 12 g L−1) and 23.80% (10/42) had anemia (Hb < 10 g L−1).