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Subgroup analyses for the association between GST polymorphisms and breast cancer risk. Boxes represent the OR of individual studies, and diamonds represent the overall OR. Horizontal lines represent the 95% CI. A. GSTT1 polymorphism. B. GSTM1 polymorphism. C. GSTP1 polymorphism under dominant model (GG+AG vs AA). D. GSTP1 polymorphism under allelic model (G vs A).
