Table 3.
Immunohistochemical ‘intrinsic’ subtypes of groups 1, 2, and 3
| Parameter | No. of cases (%) | P | |||
|---|---|---|---|---|---|
| Total | Group 1 | Group 2 | Group 3 | ||
| Average age (±SD) | 54.5 (±11.3) | 51.9 (±6.0) | 55.0 (±13.4) | 56.1 (±10.9) | |
| Stage | |||||
| I | 9 | 3 (23) | 3 (13) | 3 (20) | NS |
| II | 35 | 8 (62) | 16 | (70) | 11 (73) |
| III | 7 | 2 (15) | 4 | (17) | 1 (7) |
| Histological type | |||||
| Invasive ductal | 47 | 12 (92) | 23 (100) | 12 (80) | NS |
| Invasive lobular3 | 3 | 0 (0) | 0 (0) | 3 (20) | |
| Squamous cell | 1 | 1 (8) | 0 (0) | 0 (0) | |
| Grade | |||||
| 1 and 2 | 19 | 2 (15) | 7 (30) | 10 (67) | NS |
| 3 | 32 | 11 (85) | 16 (70) | 5 (33) | |
| Immunohistochemical subtype | |||||
| Triple negative | 11 | 9 (69) | 0 (0) | 2 (13) | 0.000061 |
| Luminal A-like | 15 | 2 (15) | 4 (17) | 9 (60) | |
| Luminal B-like | 18 | 2 (15) | 13 (57) | 3 (20) | |
| HER2 overexpressing | 6 | 0 (0) | 6 (26) | 0 (0) | |
| Not identified | 1 | 0 (0) | 0 (0) | 1 (7) | |
| Total | 51 | 13 (100) | 23 (100) | 15 (100) | |
NS not significant