Table 2.
Clinicopathologic characteristics of subtypes
| Subtypes | Luminal A (n = 35) |
Luminal B (n = 7) |
Total (n = 42) |
P value* |
| Demographics | ||||
| Mean age (years) | 64 | 58 | 63 | 0.25 |
| Race | ||||
| Caucasian | 22 | 6 | 28 | |
| African American | 6 | 1 | 7 | |
| Hispanic | 7 | 0 | 7 | |
| Histologic type | ||||
| Invasive ductal carcinoma | 30 | 7 | 37 (88%) | |
| Invasive papillary carcinoma | 5 | 0 | 5 (12%) | |
| Other types | 0 | 0 | 0 | |
| Nuclear grade | 0.06 | |||
| 1 | 2 | 0 | 2 | |
| 2 | 21 | 2 | 23 | |
| 3 | 12 | 5 | 17 | |
| Cases with positive lymph node | 14 (41%) | 5 (71%) | 19 (45%) | 0.40 |
| Mean number of positive lymph nodes | 1.5 | 2.3 | 1.6 | 0.40 |
| Stage grouping | ||||
| I | 9 | 1 | 10 | |
| IIA | 10 | 3 | 13 | |
| IIB | 9 | 2 | 11 | |
| IIIA | 2 | 0 | 2 | |
| IIIB | 4 | 1 | 5 | |
| IV | 1 | 0 | 1 | |
* Fisher's exact test.