Table 1.
Comparison of patient characteristics
| Parameters | Primary (%) | Secondary (%) | p |
|---|---|---|---|
| Age (years) | |||
| Median | 50–54 | 70–74 | |
| < 60 | 141 (64.7) | 29 (16.8) | |
| ≥ 60 | 77 (35.3) | 144 (83.2) | <0.001 |
| Race | |||
| Non-white | 40 (18.3) | 13 (7.5) | |
| White | 178 (81.7) | 160 (92.5) | 0.002 |
| Site | |||
| Outer quandrant | 40 (18.3) | 21 (12.1) | |
| Inner Quandrant | 37 (16.9) | 15 (8.7) | |
| Central | 14 (6.4) | 12 (6.9) | |
| Overlapa | 62 (28.4) | 31 (17.9) | |
| NOSb | 65 (30) | 90 (52) | |
| Nipple | 0 (0) | 4 (2.4) | <0.001 |
| Tumor spreadc | |||
| Local | 179 (82.1) | 84 (48.6) | |
| Regional | 39 (17.9) | 89 (51.4) | <0.001 |
| Tumor grade | |||
| G1 | 34 (15.6) | 13 (7.5) | |
| G2 | 54 (24.8) | 22 (12.7) | |
| G3 | 70 (32.1) | 100 (57.8) | |
| Gx | 60 (27.5) | 38 (22) | <0.001 |
| Number of primariesd | |||
| 1 | 179 (82.1) | 0 (0) | <0.001 |
| 2 | 33 (15.1) | 111 (64.2) | |
| ≥ 3 | 6 (2.8) | 62 (35.8) |
aMore than one quandrant but less than half breast size
bEntire breast: ¾ or more of breast involved with tumor, or multiple tumors in different subsites
cLocal: tumor spread limited to the organ of origin; regional: beyond the limit of the organ of origin
dNumber of different primary tumors developed in an individual by the time of last data collection in SEER database