Table 1.
patient demographics and breast lesion characteristics
| Characteristics | Main cohort | External cohort | Portable US |
|---|---|---|---|
| Total no. of cases | 2501 | 1730 | 349 |
| Age,years: median (25th, 75th, percentiles) | 49 (39, 60) | 44 (24, 52) | 48 (39, 61) |
| Lesion size (mm) | |||
| <10 (%) | 545 (21.8%) | 259 (15.0%) | 41 (11.7%) |
| 10~19.9 (%) | 1100 (44.0%) | 863 (49.9%) | 156 (44.7%) |
| 20~30 (%) | 546 (21.8%) | 450 (26.0%) | 108 (30.9%) |
| >30 (%) | 310 (12.4%) | 158 (9.1%) | 44 (12.6%) |
| Lesion depth (mm) | |||
| <10 (%) | 385 (15.4%) | 287 (16.6%) | 72 (20.6%) |
| 10~14.9 (%) | 1256 (50.2%) | 893 (51.6%) | 184 (52.7%) |
| 15~20 (%) | 710 (28.4%) | 461 (26.6%) | 80 (22.9%) |
| >20 (%) | 150 (6.0%) | 89 (5.1%) | 13 (3.7%) |
| BI-RADS categorya | |||
| 2 (%) | 5 (0.2%) | 1 (0.1%) | 2 (0.6%) |
| 3 (%) | 335 (13.4%) | 595 (34.4%) | 39 (11.2%) |
| 4a (%) | 728 (29.1%) | 443 (25.6%) | 110 (31.5%) |
| 4b (%) | 415 (16.6%) | 245 (14.2%) | 47 (13.5%) |
| 4c (%) | 643 (25.7%) | 296 (17.1%) | 92 (26.4%) |
| 5 (%) | 375 (15.0%) | 150 (8.7%) | 59 (16.9%) |
| Lesion location | |||
| Upper outer (%) | 1050 (42.0%) | 780 (45.1%) | 154 (44.2%) |
| Upper inner (%) | 710 (28.4%) | 438 (25.3%) | 92 (26.3%) |
| Lower inner (%) | 215 (8.6%) | 167 (9.7%) | 32 (9.2%) |
| Lower outer (%) | 526 (21.0%) | 345 (19.9%) | 71 (20.3%) |
| Lesion type | |||
| Invasive carcinomab (%) | 1100 (44.0%) | 587 (33.9%) | 174 (49.9%) |
| Carcinoma in situ (%) | 170 (6.8%) | 28 (1.6%) | 16 (4.6%) |
| Other malignantc (%) | 80 (3.2%) | 65 (3.8%) | 6 (1.7%) |
| Fibroadenoma (%) | 730 (29.2%) | 700 (40.5%) | 90 (25.8%) |
| Other benignd (%) | 421 (16.8%) | 350 (20.2%) | 63 (18.0%) |
aThe BI-RADS category summarized in this table is based on the interpretation of the US radiologists who originally performed the US examinations.
bThe invasive carcinoma includes invasive ductal carcinoma, invasive lobular carcinoma.
cThe other malignant includes mucinous carcinoma and non-specific malignant results.
dIncludes adenosis, hyperplasia, papillomas tumours and benign phyllodes.