Table 2.
Surgical and pathological characteristics of women with non-metastatic triple-negative breast cancer at the Sultan Qaboos University Hospital, Muscat, Oman (N = 79)
| Characteristic | n (%) |
|---|---|
| Type of surgery | |
| Modified radical mastectomy | 31 (39.2) |
| BCS and ALND | 23 (29.1) |
| BCS and SLN | 14 (17.7) |
| Skin-sparing mastectomy and ALND | 3 (3.8) |
| Simple mastectomy and SLN | 1 (1.3) |
| None | 7 (8.9) |
| Pathological type | |
| Infiltrating ductal carcinoma | 77 (97.5) |
| Infiltrating lobular carcinoma | 1 (1.3) |
| Micropapillary carcinoma | 1 (1.3) |
| Pathological tumour size | |
| T0 | 8 (10.1) |
| T1 | 17 (21.5) |
| T2 | 31 (39.2) |
| T3 | 12 (15.2) |
| T4 | 5 (6.3) |
| Unknown | 6 (7.6) |
| Pathological node status | |
| N0 | 37 (46.8) |
| Nmic | 1 (1.3) |
| N1 | 17 (21.5) |
| N2 | 10 (12.7) |
| N3 | 7 (8.9) |
| Unknown | 7 (8.9) |
| Pathological stage | |
| pCR to chemotherapy | 6 (7.6) |
| I | 9 (11.4) |
| II | 37 (46.8) |
| III | 20 (25.3) |
| Unknown | 7 (8.9) |
| Pathological grade | |
| I | 2 (2.5) |
| II | 12 (15.2) |
| III | 61 (77.2) |
| Unknown | 4 (5.1) |
| Lymphovascular invasion | |
| No | 38 (48.1) |
| Yes | 24 (30.4) |
| Unknown | 17 (21.5) |
| Ki67 score | |
| <20% | 2 (2.5) |
| >20% | 59 (74.7) |
| Unknown | 18 (22.8) |
BCS = breast conservation surgery; ALND = axillary lymph node dissection; SLN = sentinel lymph node biopsy; T0 = main tumour could not be found; T1 = tumour of ≤2 cm; T2 = tumour of 2.1–5 cm; T3 = tumour of >5 cm; T4 = tumour of any size with invasion or adherence to pectoralis muscle, skin ulceration, skin oedema and inflammatory carcinoma; N0 = absence of nodal involvement; Nmic = node micrometastases; N1 = metastasis to 1–3 ipsilateral axillary lymph nodes; N2= metastasis to 4 –9 ipsilateral axillary lymph nodes; N3= metastasis to ≥10 axillary lymph nodes, infraclavicular lymph nodes; pCR = complete pathological response.