Odds ratios for breast cancer risk by tumor grade*.

*Analyses excluded data from three studies (MEC, NHS and TBCS) without information on tumor grade.**Per-allele OR adjusted for study.***P value for heterogeneity of ORs from case-only analyses adjusted by study.****Permutation adjusted P for heterogeneity* 本次分析剔除了三项研究（MEC、NHS及TBCS）中未提供肿瘤分级（tumor grade）信息的数据。 ** 等位基因比值比（Per-allele OR）经研究校正。 *** 经研究校正的仅病例分析所得比值比的异质性检验P值。 **** 异质性检验的置换校正P值。