Table 2.
Tumour characteristicsa
| Parameter | N | % | |
| Histology | IDC on both sides | 19 | 90.5 |
| IDC on one side and other histology on contralateral side | 2 | 9.5 | |
| Grade | III | 18 | 85.7 |
| II | 3 | 14.3 | |
| ER status | Positive | 17 | 81.0 |
| Negative | 4 | 19.0 | |
| PR status | Positive | 15 | 71.4 |
| Negative | 6 | 28.6 | |
| Her2neu status | Positive | 8 | 38.0 |
| Negative | 13 | 62.0 | |
| PNI | Present | 0 | 0 |
| Absent | 21 | 100.0 | |
| LVE | Present | 9 | 43.0 |
| Absent | 12 | 57.0 | |
| EIC | Present | 6 | 28.6 |
| Absent | 15 | 71.4 | |
| Skin involvement | Present | 1 | 5.0 |
| Absent | 20 | 95.0 | |
| Margins | Negative | 21 | 100.0 |
| PNE | Present | 11 | 52.4 |
| Absent | 10 | 47.6 |
DCIS, ductal carcinoma in situ; EIC, extensive intraductal component; ER,estrogen receptor; IDC, infiltrating ductal carcinoma;LVE, lymphovascular emboli; PNE, perinodal extension; PNI, perineural invasion; PR, progesterone receptor.
aTumour characteristic positive on either side was considered overall positive and reported here.