Table 1.
Clinicopathological characteristics of younger (<35) and older age groups
| Characteristics | Age <35 (%) (n = 256) | Age ≥ 35 (%) (n = 1784) | P value |
| Age | |||
| 20–25 | 9 (3.5) | ||
| 26–30 | 56 (21.9) | ||
| 31–35 | 191 (74.6) | ||
| 36–40 | 318 (17.8) | ||
| 41–50 | 791 (44.3) | ||
| 51–60 | 474 (26.6) | ||
| 60–70 | 165 (9.2) | ||
| 71- | 36 (2.0) | ||
| Family historya | 22 (8.7) | 135 (7.6) | 0.511 |
| Histology | |||
| Ductal | 238 (93.0) | 1624 (91.0) | |
| Lobular | 2 (0.8) | 30 (1.7) | |
| Medullary | 10 (3.9) | 29 (1.6) | 0.018 |
| others | 6 (2.3) | 101 (5.7) | |
| T stage | |||
| T1 | 99 (38.7) | 770 (43.2) | |
| T2 | 129 (50.4) | 855 (47.9) | |
| T3–4 | 28 (10.9) | 159 (8.9) | 0.126 |
| Lymph node metastasis | |||
| Negative | 138 (53.9) | 1063 (59.6) | |
| Positive | 118 (46.1) | 721 (40.4) | 0.084 |
| Histological grade | |||
| 1–2 | 78 (58.6) | 525 (60.0) | |
| 3 | 55 (41.4) | 350 (40.0) | 0.767 |
| Nuclear grade | |||
| 1–2 | 113 (52.6) | 901 (61.3) | |
| 3 | 102 (47.4) | 570 (38.7) | 0.015 |
| ER | |||
| Positive | 97 (47.1) | 907 (51.8) | |
| Negative | 109 (52.9) | 843 (48.2) | 0.198 |
| PR | |||
| Positive | 73 (36.7) | 708 (43.5) | |
| Negative | 126 (63.3) | 921 (56.5) | 0.068 |
| c-erbB2 | |||
| Negative | 94 (52.8) | 647 (46.4) | |
| Positive | 84 (47.2) | 748 (53.6) | 0.106 |
aPatients who have 1st or 2nd degree relatives with breast cancer