GSTM1 and anemia (phenotype): A more recent study by Ricci et al. outlined an 81% increased risk of anemia and low Hb in type 0 myoma (submucosal fibroid class 0) regardless of the presence of menorrhagia or self-reported symptoms, and an increased risk of anemia with types 1 and 2 in the presence of menorrhagia or if myomas are >60 mm [5].