Patient’s background characteristics
| Factor | N |
| Total | 59 |
| Age | |
| 55–59 | 9 |
| 60–69 | 33 |
| 70–79 | 17 |
| T | |
| 2 | 57 |
| 3 | 2 |
| N | |
| 0 | 43 |
| 1 | 16 |
| Clinical stage | |
| IIA | 43 |
| IIB | 14 |
| IIIA | 2 |
| ER | |
| + | 59 |
| − | 0 |
| PgR | |
| + | 55 |
| − | 4 |
| HER2 | |
| + | 0 |
| − | 59 |
| Adjuvant chemotherapy | |
| + | 18 |
| − | 41 |
ER, oestrogen receptor;HER2, human epidermal growth factor receptor 2; PgR, progesterone receptor.