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Sensitive analysis between the combined effects of GSTM1 and GSTT1 polymorphisms and breast cancer risk in overall population ((− +) + (+ −) + (− −) vs + +). + − = GSTM1 present/GSTT1 null, − + = GSTM1 null/GSTT1 present, − − = GSTM1 null/GSTT1 null, + + = GSTM1 present/GSTT1 present, GSTM1 = glutathione S-transferase M1, GSTT1 = glutathione S-transferase T1.
