GSTP1 and Thrombocytopenia: Severe thrombocytopenia was found in 35 (31.2%) women and was also less frequent in women with the GSTP1 c.313A>G AG or GG genotype (P = 0.02 and P < 0.01, respectively); only 34% of subjects with grade 1 to grade 4 thrombocytopenia carried GSTP1 c.313A>G (dominant model: AA vs. AG + GG) compared with 66% of carriers in the no toxicity group (P < 0.01).