Table 1.
Demographic and tumor characteristics
| Characteristic | Number of patients | Percentage (%) |
|---|---|---|
| N | 1189 | 100 |
| Age (year) | ||
| < 40 | 54 | 4.54 |
| 40–49 | 176 | 14.80 |
| 50–59 | 348 | 29.27 |
| 60–69 | 343 | 28.85 |
| ≥ 70 | 268 | 22.54 |
| Mean of age (year) | 59.88 | |
| Median of age (year, range) | 60.00 (26–85) | |
| Race | ||
| White | 942 | 79.23 |
| Black | 139 | 11.69 |
| Asian or Pacific Islander | 95 | 7.99 |
| American Indian/Alaska Native | 9 | 0.76 |
| Unknown/other | 4 | 0.34 |
| Marital status | ||
| Not married | 449 | 37.76 |
| Married | 699 | 58.79 |
| Unknown | 41 | 3.45 |
| Grade | ||
| I/II | 65 | 5.47 |
| III | 223 | 18.76 |
| IV | 10 | 0.84 |
| Unknown | 891 | 74.94 |
| Laterality | ||
| Right | 565 | 47.52 |
| Left | 624 | 52.48 |
| Histology | ||
| Ductal carcinoma | 476 | 40.03 |
| Lobular carcinoma | 54 | 4.54 |
| Mixed type | 25 | 2.10 |
| Other | 634 | 53.32 |
| N | ||
| N1mi | 31 | 2.61 |
| N1 | 721 | 60.64 |
| N2 | 228 | 19.18 |
| N3 | 209 | 17.58 |
| No. of examined LN | ||
| 1–3 | 182 | 15.31 |
| 4–9 | 177 | 14.89 |
| ≥ 10 | 675 | 56.77 |
| Other/unknown | 155 | 13.04 |
| No. of positive LN | ||
| 1–3 | 615 | 51.72 |
| 4–9 | 212 | 17.83 |
| ≥ 10 | 148 | 12.45 |
| Other/unknown | 214 | 18.00 |
| Stage | ||
| IB | 31 | 2.61 |
| IIA | 722 | 60.72 |
| IIIA | 228 | 19.18 |
| IIIC | 208 | 17.49 |
| Surgery | ||
| BCS | 120 | 10.09 |
| Mastectomy | 422 | 35.49 |
| None/unknown | 647 | 54.42 |
| Radiation | ||
| Yes | 688 | 57.86 |
| None/unknown | 501 | 42.13 |
| Chemotherapy | ||
| Yes | 929 | 78.13 |
| No/unknown | 260 | 21.87 |
| Type of systemic therapy | ||
| Neoadjuvant | 118 | 9.92 |
| Adjuvant | 583 | 49.03 |
| Neoadjuvant + adjuvant | 104 | 8.75 |
| Only systemic therapy, no surgery | 28 | 2.35 |
| Other | 190 | 15.98 |
| No/unknown | 166 | 13.96 |
| Subtypes | ||
| Luminal A | 326 | 27.42 |
| Luminal B | 111 | 9.34 |
| HER2 positive | 74 | 6.22 |
| Triple negative | 148 | 12.45 |
| Unknown | 530 | 44.58 |
| ER | ||
| Negative | 414 | 34.82 |
| Borderline/unknown | 100 | 8.41 |
| Positive | 675 | 56.77 |
| PR | ||
| Negative | 598 | 50.29 |
| Borderline/unknown | 126 | 10.60 |
| Positive | 465 | 39.11 |
| HER2 | ||
| Negative | 474 | 39.87 |
| Positive | 187 | 15.73 |
| Unknown | 528 | 44.41 |
| Vital status | ||
| Alive | 917 | 77.12 |
| Dead | 272 | 22.88 |
BCS breast-conserving surgery, MRM modified radical mastectomy, RM radical mastectomy