Table 3.

Proportion of deaths according to detection mode, breast density, and tumor phenotype

Luminal ALuminal BHER2Triple-negative
Breast densityN TotalN Death (%)N TotalN Death (%)N TotalN Death (%)N TotalN Death (%)
Screen-detected cancers<25%433 (7)300 (0)a40 (0)141 (7.1)
>25%304 (13.3)194 (21.1)a85 (62.5)60 (0)
Interval cancers<25%365 (13.9)164 (25)71 (14.3)153 (20)
>25%469 (19.6)277 (25.9)123 (25)92 (22.2)
True interval cancers<25%163 (18.8)81 (12.5)31 (33.3)83 (37.5)
>25%203 (15)133 (23.1)103 (30)72 (28.6)
  • aP < 0.05. P values were obtained using the two-sided χ2 or Fisher's exact two-sided test when appropriate, to assess the distribution of deaths among breast density categories and phenotypes within study groups.