Table 2.
Tumor characteristics at diagnosis according to mammographic density at diagnosis
| BI-RADSa a | BI-RADS b | BI-RADS c | BI-RADS d | ||
|---|---|---|---|---|---|
| Estrogen receptor status | positive | 5 (31.3) | 69 (57.5) | 89 (63.6) | 20 (76.9) |
| negative | 11 (68.8) | 47 (39.2) | 46 (32.9) | 6 (23.1) | |
| missing | 4 (3.3) | 5 (3.6) | |||
| Progesterone receptor status | positive | 4 (25.0) | 44 (36.7) | 77 (55.0) | 15 (57.7) |
| negative | 12 (75.0) | 72 (60.0) | 58 (41.4) | 11 (42.3) | |
| missing | 4 (3.3) | 5 (3.6) | |||
| HER2 status | positive | 3 (18.8) | 45 (37.5) | 38 (27.1) | 9 (34.6) |
| negative | 11 (68.8) | 68 (56.7) | 95 (67.9) | 17 (65.4) | |
| missing | 2 (12.5) | 7 (5.8) | 7 (5.0) | ||
| Ki67 | > 20% (high) | 12 (75.0) | 89 (74.2) | 89 (63.6) | 15 (57.7) |
| <=20% (low) | 2 (12.5) | 9 (7.5) | 25 (17.9) | 3 (11.5) | |
| missing | 2 (12.5) | 22 (18.3) | 26 (18.6) | 8 (30.8) | |
| FNAb axilla | positive FNA | 11 (68.8) | 80 (66.7) | 91 (65.0) | 15 (57.7) |
| negative FNA | 8 (6.7) | 10 (7.1) | 4 (15.4) | ||
| inconclusive FNA | 1 (6.3) | 3 (2.1) | 1 (3.8) | ||
| no FNA | 4 (25.0) | 32 (26.7) | 35 (25.0) | 6 (23.1) | |
| missing | 1 (0.7) | ||||
| Tumor size at diagnosis (mm)c | median (IQR) | 34 (23–40) | 30 (21–40) | 35 (25–50) | 30 (20–40) |
aThroughout the table BI-RADS breast composition is intended
bfine needle aspiration
cMeasured in mammograms or in ultrasound images. When both methods were conclusive an average measure was used