Table 1.
Clinicopathological characteristics of Cohorts I and II
| Cohort I (n = 179) | Cohort II (n = 564) | |
| Age (years) | ||
| Median (range) | 65 (35 to 97) | 45 (25 to 57) |
| Tumour size | ||
| ≤ 20 mm | 105 (59) | 208 (37) |
| >20 mm | 74 (41) | 356 (63) |
| Grade | ||
| I | 38 (21) | 58 (10) |
| II | 79 (44) | 222 (40) |
| III | 62 (35) | 234 (42) |
| Missing | 50 (8.9) | |
| Histological type | ||
| Indeterminate | 3 (2) | 7 (2) |
| Invasive ductal carcinoma | 125 (70) | 411 (73) |
| Invasive lobular carcinoma | 31 (17.3) | 43 (7.6) |
| Tubular | 16 (8.9) | 5 (1) |
| Medullary | 4 (2.2) | 25 (4) |
| Mucinous | 3 (1) | |
| Missing | 70 (12) | |
| Nodal status | ||
| Negative | 87 (49) | 160 (28) |
| Positive | 65 (36) | 402 (71) |
| Missing | 27 (15) | 2 (0.3) |
| Oestrogen receptor status | ||
| Positive | 157 (88) | 324 (57) |
| Negative | 22 (12) | 151 (27) |
| Missing | 89 (16) | |
| Progesterone receptor status | ||
| Positive | 52(29) | 147 (26) |
| Negative | 127 (71) | 312 (55) |
| Missing | 105 (19) |
Data in parentheses represent percentages unless otherwise stated.