Table 2.
Treatment characteristics and clinical outcomes of patients who had breast conservation surgery
| Variables (n = 563) | |
|---|---|
| Treatment characteristics | |
| Re-excision (no. of operations) | |
| 0 | 502 (89.2%) |
| 1 | 60 (10.7%) |
| 2 | 1 (0.2%) |
| Margin achieved | |
| < 1 mm | 8(1.4%) |
| 1–2 mm | 22 (3.9%) |
| 3–4 mm | 67(11.9%) |
| ≥ 5 mm | 461 (81.9%) |
| Unknown | 5 (0.9%) |
| Radiation boost | |
| Yes | 340 (60.4%) |
| No | 223 (39.6%) |
| Chemotherapy | |
| Yes | 114(20.2%) |
| No | 442 (78.5%) |
| Unknown | 7(1.2%) |
| Hormonal therapy | |
| Yes | 442 (78.5%) |
| No | 85 (15.1%) |
| Unknown | 36 (6.4%) |
| Clinical outcomes | |
| Follow-up: median (range) | 4.8 (0.08–8.3) yrs |
| 5-year actuarial IBTR rate | 1.1% |
| 5-year crude IBTR rate | 0.9% (5 of 563) |
| 5-year actuarial DDR rate | 5.4% |
| 5-year crude DDR rate | 5.2% (29 of 563) |
| 5-year breast cancer specific survival | 95.0% |
| 5-year breast cancer specific survival by NPI groups | |
| Group 1 (excellent prognostic group) | 100% |
| Group 2 (good) | 99.2% |
| Group 3 (moderate I) | 96.1% |
| Group 4 (moderate II) | 86.6% |
| Group 5 (poor) | 88.6% |
| Group 6 (very poor) | 75.2% |
| Overall 5-year survival | 90.3% |
IBTR, ipsilateral breast tumour recurrence; DDR, distant disease recurrence; NPI, Nottingham Prognostic Index.