Mammographic Density and Prognosis among Breast Cancer Intrinsic Subtypes

The primary goal of this study is to determine whether mammographic density at diagnosis of invasive breast cancer predicts risk of subsequent breast cancer events among patients participating in two large and well-characterized population-based cohorts (LACE and Pathways) within the Kaiser Permanente Northern California health plan membership. Breast cancers have already been classified into intrinsic subtypes using a 50-gene assay (PAM50 assay).

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