Table 1.
Clinicopathological Characteristics of Included Patients (n=1010)
| Variable | n | Percentage |
|---|---|---|
| Age (mean ± SD) | 48.28±11.30 | |
| Type of surgery | ||
| Mastectomy | 846 | 83.8% |
| Breast-conserving surgery | 164 | 16.2% |
| Reconstruction after mastectomy | ||
| Yes | 145 | 14.4% |
| No | 865 | 85.6% |
| pT classification | ||
| Tis-T1 | 588 | 58.2% |
| T2–4 | 341 | 33.8% |
| Unknown | 81 | 8.0% |
| Axillary involvement | ||
| Yes | 329 | 32.6% |
| No | 681 | 67.4% |
| Excision biopsy before surgery | ||
| Yes | 207 | 20.5% |
| No | 803 | 79.5% |
| Pathological diagnosis | ||
| DCIS and Paget’s disease | 112 | 11.1% |
| Invasive ductal carcinoma | 790 | 78.2% |
| Othersa | 108 | 10.7% |
| Tumor Location | ||
| Upper outer quadrant | 362 | 35.8% |
| Other quadrants | 574 | 56.8% |
| Unknown | 74 | 7.3% |
| Number of SLNs detected | ||
| 1–2 | 624 | 61.8% |
| 3–4 | 334 | 33.1% |
| ≥5 | 52 | 5.1% |
Notes: aIncluding papillary carcinoma, mucous carcinoma, invasive lobular carcinoma, malignant phyllode tumor, secretory carcinoma, metaplastic carcinoma, squamous cell carcinoma, adenoid cystic carcinoma and mixed carcinoma.
Abbreviations: SD, standard deviation; SLNs, sentinel lymph nodes; DCIS, ductal carcinoma in situ.