Table 4. Distribution of estrogen receptor and progesterone receptor scores in the luminal type breast cancers based on St. Gallen Consensus 2013.
| Luminal A (n = 58) No. (%) | Luminal B (n = 120) No. (%) | p-value* | B1 (n = 29) No. (%) | B2 (n = 73) No. (%) | B3 (n = 18) No. (%) | p-value† | |
|---|---|---|---|---|---|---|---|
| ER score | 0.153 | 0.003 | |||||
| ≤3 | 0 | 7 (5.8) | 3 (10.3) | 3 (4.1) | 1 (5.5) | ||
| 4-5 | 2 (3.4) | 9 (7.5) | 1 (3.4) | 5 (6.8) | 3 (16.7) | ||
| 6 | 8 (13.8) | 19 (15.8) | 11 (37.9) | 8 (11.0) | 0 | ||
| 7-8 | 48 (82.8) | 85 (70.8) | 14 (48.3) | 57 (78.1) | 14 (77.8) | ||
| PR score | < 0.001 | 0.003 | |||||
| ≤3 | 0 | 27 (22.5) | 8 (27.6) | 14 (19.2) | 5 (27.8) | ||
| 4-5 | 3 (5.2) | 37 (30.8) | 12 (41.4) | 15 (20.5) | 10 (55.6) | ||
| 6 | 11 (19.0) | 16 (13.3) | 3 (10.3) | 10 (13.7) | 3 (16.7) | ||
| 7-8 | 44 (75.9) | 40 (30.0) | 6 (20.7) | 34 (46.6) | 0 |
B1=HER2-positive luminal B type; B2=HER2-negative luminal B type showing Ki-67 (≥14%) and any PR; B3= HER2-negative luminal B type showing any Ki-67 and PR <20%; ER=estrogen receptor; PR=progesterone receptor.
*Between the luminal A and B type; †Among subgroups of the luminal B type.