Table 1.
Patient demographics and baseline characteristics
| Characteristic | Device (n = 298) | Control (n = 298) |
|---|---|---|
| Age, years, mean (SD) | 60.3 (11.4) | 60.2 (11.1) |
| Ethnic origin, n (%) | ||
| Whitea | 250 (83.9) | 260 (87.2) |
| Black | 22 (7.4) | 17 (5.7) |
| Asian | 12 (4.0) | 10 (3.4) |
| Other | 14 (4.7) | 11 (3.7) |
| Body mass index, kg/m2, mean (SD) | 27.9 (6.6) | 28.6 (6.6) |
| Diagnosis, n (%) | ||
| Invasive ductal | 181 (60.7) | 202 (67.8) |
| Invasive lobular | 26 (8.7) | 13 (4.4) |
| Mixed invasive | 8 (2.7) | 5 (1.7) |
| Ductal carcinoma-in situ | 83 (27.9) | 78 (26.2) |
| Receptor status, n (%) | ||
| ER positive | 251 (84.2) | 258 (86.6) |
| PR positive | 223 (74.8) | 217 (72.8) |
| Preoperative imaging, n (%) | ||
| Mammogram | 296 (99.3) | 294 (98.7) |
| MRI | 184 (61.7) | 174 (58.4) |
| Ultrasound | 228 (76.5) | 289 (97.0) |
| Preoperative core biopsy, n (%) | 287 (96.3) | 289 (97.0) |
| Mean extent of disease, cm | 1.7 | 1.6 |
| Main lumpectomy specimen volume, ml | 61 | 60 |
SD standard deviation, ER estrogen receptor, PR progesterone receptor, MRI magnetic resonance imaging
aIncluding Hispanics