Severe anemia was found in 13 (11.6%) women and GSTP1 c.313A>G AG genotype were less likely to have severe anemia (P = 0.04); only 23% of women with severe anemia in GSTP1 c.313A>G (dominant model: AA vs. AG + GG) compared with 60% of subjects with no toxicity. Here, GSTP1 is linked to anemia.