Table 3.
MRI features of TNBC-MC and TNBC-NMC in the training and validation set.
| Training set (n=88) | Validation set (n=29) | |||||
|---|---|---|---|---|---|---|
| NMC (n=68) | MC (n=20) | P value | NMC (n=20) | MC (n=9) | P value | |
| Size (mm) | 0.269 | 0.143 | ||||
| ≤20 | 18 (26.5%) | 2 (10.0%) | 5 (25.0%) | 1(11.2%) | ||
| >20and≤50 | 36 (52.9%) | 14 (70.0%) | 13(65.0%) | 4 (44.4%) | ||
| >50 | 14 (20.6%) | 4 (20.0%) | 2 (10.0%) | 4 (44.4%) | ||
| T1WI | 0.075 | 0.287 | ||||
| Hyperintense | 4 (5.9%) | 4 (20%) | 2 (10%) | 3 (33.3%) | ||
| Hypo or isointense | 64 (94.1%) | 16 (80%) | 18 (90%) | 6 (66.7%) | ||
| T2WI | 0.318 | 1.000 | ||||
| Iso or hyper intense | 65 (95.6%) | 18 (80.0%) | 18 (90.0%) | 9(100%) | ||
| Hypointense | 3 (4.4%) | 2 (20.0%) | 2 (10.0%) | 0 | ||
| Lesion type | 0.001 | 0.066 | ||||
| Mass | 36 (52.9%) | 19 (95.0%) | 13 (65.0%) | 9 (100%) | ||
| Nonmass & both | 32 (47.1%) | 1 (5.0%) | 7 (35.0%) | 0 (0.0%) | ||
| Shape | 0.543 | 1.000 | ||||
| Round/oval | 19 (27.9%) | 7 (35.0%) | 8 (40.0%) | 4 (44.4%) | ||
| Irregular | 49 (72.1%) | 13 (65.0%) | 12 (60.0%) | 5 (55.6%) | ||
| Margin | 0.481 | 0.287 | ||||
| Circumscribed | 9 (13.2%) | 4 (20.0%) | 2 (10.0%) | 6 (66.7%) | ||
| Not clear | 59 (86.8%) | 16 (80.0%) | 18 (90.0%) | 3 (33.3%) | ||
| Internal enhancement pattern | 0.029 | 0.209 | ||||
| Heterogeneous | 50 (73.5%) | 9 (45.0%) | 16 (80.0%) | 5 (55.6%) | ||
| Rim enhancement | 18 (26.5%) | 11 (55.0%) | 4 (20.0%) | 4 (44.4%) | ||
TNBC,triple-negative breast cancer; MC, metaplastic carcinoma; NMC, non-metaplastic carcinoma.
Bold means P values ≤0.05 were considered statistically significant.