Characteristic | All patients (N= 549) | Node negative patients (N= 341) | ||
---|---|---|---|---|
 | No. of Patients | % | No. of Patients | % |
Age, years | Â | Â | Â | Â |
Median (range) | 36.8 (23 to 40) | 36.8 (25 to 40) | ||
Age distribution | Â | Â | Â | Â |
   ≥ 30 years | 57 | 10 | 40 | 12 |
   31 to 35 years | 178 | 32 | 107 | 31 |
   35 to 40 years | 314 | 58 | 194 | 57 |
Pathological tumor size | Â | Â | Â | Â |
   T1a and T1b | 37 | 7 | 30 | 10 |
   T1c | 296 | 60 | 241 | 64 |
   T2 | 158 | 32 | 82 | 26 |
   T3 | 6 | 1 | 2 | 1 |
   Missing | 32 |  | 26 |  |
Pathological nodal status | Â | Â | Â | Â |
   Negative | 341 | 63 | 341 | 100 |
   Positive | 204 | 37 | 0 | 0 |
   Missing | 4 |  |  |  |
Surgery | Â | Â | Â | Â |
   Breast conserving | 446 | 81 | 299 | 88 |
   Mastectomy | 102 | 19 | 42 | 12 |
   Missing | 1 |  | 0 |  |
Adjuvant chemotherapy1 | Â | Â | Â | Â |
   No | 326 | 60 | 304 | 89 |
   Yes | 221 | 40 | 37 | 11 |
   Missing | 2 |  | 0 |  |
ER status | Â | Â | Â | Â |
   Positive | 310 | 66 | 115 | 41 |
   Negative | 158 | 34 | 165 | 59 |
   Missing | 81 |  | 61 |  |
PgR status | Â | Â | Â | Â |
   Positive | 223 | 48 | 141 | 51 |
   Negative | 241 | 52 | 136 | 49 |
   Missing | 85 |  | 64 |  |
Tumor type | Â | Â | Â | Â |
   Ductal | 497 | 96 | 306 | 96 |
   Lobular | 17 | 3 | 10 | 3 |
   Other | 5 | 1 | 4 | 1 |
   Missing | 30 |  | 21 |  |
Histological grade | Â | Â | Â | Â |
   I | 76 | 15 | 54 | 17 |
   II | 165 | 32 | 93 | 29 |
   III | 276 | 53 | 172 | 54 |
   Missing | 32 |  | 22 |  |
Lymphangio invasion | Â | Â | Â | Â |
   None | 357 | 69 | 243 | 76 |
   1-5 vessels | 86 | 17 | 49 | 15 |
   > 5 vessels | 76 | 14 | 27 | 9 |
   Missing | 30 |  | 22 |  |
HER2 status | Â | Â | Â | Â |
   Negative | 346 | 74 | 216 | 63 |
   Positive | 119 | 26 | 64 | 19 |
   Missing | 84 |  | 61 |  |
P53 status | Â | Â | Â | Â |
   Negative | 331 | 71 | 198 | 72 |
   Positive | 133 | 29 | 78 | 28 |
   Missing | 85 |  | 65 |  |
Molecular subtype | Â | Â | Â | Â |
   Luminal A | 154 | 34 | 79 | 29 |
   Luminal B | 157 | 34 | 86 | 32 |
   HER-2 | 35 | 8 | 90 | 34 |
   Basal (triple-negative) | 111 | 24 | 14 | 5 |
   Missing | 92 |  | 72 |  |