Table 1.
Demographic and clinical characteristics of participants in the training set and the test set.a
| Characteristics | Total (n=1592) | Training set (n=1114) | Test set (n=478) | |
| Deaths, n (%) | 147 (9.23) | 103 (9.25) | 44 (9.21) | |
| Patients alive, n (%) | 1445 (90.77) | 1011 (90.75) | 434 (90.79) | |
| Follow-up (years), mean (SD) | 6.38 (2.68) | 6.40 (2.68) | 6.32 (2.68) | |
| Age at diagnosis (years), mean (SD) | 49.92 (11.59) | 49.68 (11.48) | 50.50 (11.82) | |
| Clinical stage, n (%) |
|
|
|
|
|
|
0 | 26 (1.63) | 21 (1.89) | 5 (1.05) |
|
|
I | 524 (32.91) | 363 (32.59) | 161 (33.68) |
|
|
II | 733 (46.04) | 508 (45.60) | 225 (47.07) |
|
|
III | 286 (17.96) | 204 (18.31) | 82 (17.15) |
|
|
IV | 23 (1.44) | 18 (1.62) | 5 (1.05) |
| Molecular classification, n (%) |
|
|
|
|
|
|
Luminal A | 215 (13.51) | 160 (14.36) | 55 (11.51) |
|
|
Luminal B | 1059 (66.52) | 723 (64.90) | 336 (70.29) |
|
|
HER-2 (+) | 232 (14.57) | 168 (15.08) | 64 (13.39) |
|
|
Basal like | 86 (5.40) | 63 (5.66) | 23 (4.81) |
| Operative type, n (%) |
|
|
|
|
|
|
Breast-conserving surgery | 95 (5.97) | 68 (6.10) | 27 (5.65) |
|
|
Mastectomy | 1497 (94.03) | 1046 (93.90) | 451 (94.35) |
| Breast reconstruction, n (%) |
|
|
|
|
|
|
Yes | 453 (28.45) | 321 (28.82) | 132 (27.62) |
|
|
No | 1139 (71.55) | 793 (71.18) | 346 (72.38) |
| Axillary lymph node dissection, n (%) |
|
|
|
|
|
|
Yes | 1143 (71.80) | 810 (72.71) | 333 (69.67) |
|
|
No | 449 (28.20) | 304 (27.29) | 145 (30.33) |
| Chemotherapy, n (%) |
|
|
|
|
|
|
Yes | 1305 (81.97) | 919 (82.50) | 386 (80.75) |
|
|
No | 287 (18.03) | 195 (17.50) | 92 (19.25) |
| Endocrine therapy, n (%) |
|
|
|
|
|
|
Yes | 1007 (63.25) | 707 (63.46) | 300 (62.76) |
|
|
No | 585 (36.75) | 407 (36.54) | 178 (37.24) |
aPercentage=number/group total number.