A lower risk of thrombocytopenia was associated with the GSTP1 c.313A>G either dominant (AA vs. AG + GG; OR: 0.27, 95% CI: 0.12–0.64, P < 0.01) or recessive model (AA + AG vs. GG; OR: 0.18, 95% CI: 0.03–0.85, P = 0.03). This evidence concerns the gene GSTP1 and Thrombocytopenia.