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Table 3 Numbers reclassified (absolute risk of developing breast cancer within the next 10 years 3%, 3 to 5%, 5 to 8%, 8 +%) for the Tyrer-Cuzick (TC) risk score compared to Tyrer-Cuzick risk score modified using the density residual

From: Mammographic breast density refines Tyrer-Cuzick estimates of breast cancer risk in high-risk women: findings from the placebo arm of the International Breast Cancer Intervention Study I

TC/TC + density residual <3% 3-5% 5-8% 8%+ Total
Control      
<3% 10 (67%) 4 (27%) 1 (7%) 0 (0%) 15 (3%)
3-5% 52 (30%) 65 (38%) 44 (26%) 10 (6%) 171 (36%)
5-8% 8 (3%) 68(29%) 92 (39%) 66 (28%) 234 (49%)
8 +% 0 (0%) 3 (5%) 16 (27%) 41 (68%) 60 (12%)
Total 70 (15%) 140 (29%) 153 (32%) 117 (24%) 480 (100%)
Case      
<3% 2 (50%) 2 (50%) 0 (0%) 0 (0%) 4 (6%)
3-5% 5 (17%) 13 (43%) 7 (23%) 5 (17%) 30 (42%)
5-8% 0 (0%) 9 (39%) 5 (22%) 9 (39%) 23 (32%)
8 +% 0 (0%) 0 (0%) 1 (7%) 14 (93%) 15 (21%)
Total 7 (10%) 24 (33%) 13 (18%) 28 (39%) 72 (100%)