Table 1. Patient and tumour characteristics.
| n (%) | |
|---|---|
| All cancers | 1147 |
| Invasive cancer | 977 (85.2) |
| Invasive cancer+DCIS | 572 |
| DCIS only | 170 (14.8) |
| Episode type (n=1145a) | |
| Prevalent | 699 (61.0) |
| Incident | 446 (39.0) |
| Age at first screen | |
| Range (median) | 40.1–92.6 (58.7) |
| Age at diagnosis | |
| Range (median) | 40.1–92.6 (59.9) |
| Invasive cancers | 977 |
| Histological type | |
| Ductal NOS | 814 (83.3) |
| Invasive lobular, classical | 47 (4.8) |
| Tubular carcinoma | 35 (3.6) |
| Mucinous carcinoma | 29 (3.0) |
| Invasive lobular, variant | 20 (2.0) |
| Other/mixed | 32 (3.3) |
| Grade (n=944b) | |
| 1 | 377 (39.9) |
| 2 | 368 (39.0) |
| 3 | 199 (21.1) |
| Tumour size (mm) (n=949c) | |
| ⩽5 | 83 (8.8) |
| >5–⩽10 | 275 (29.0) |
| >10–⩽20 | 433 (45.6) |
| >20–⩽50 | 152 (16.0) |
| >50 | 6 (0.6) |
| LN positive (n=829d) | |
| 0 | 601 (72.5) |
| 1–4 | 166 (20.0) |
| >4 | 62 (7.5) |
| DCIS+invasive cancer | |
| Histological typee | 374f |
| Low grade (noncomedo) | 81 (21.7) |
| Intermediate grade | 135 (36.1) |
| High grade (comedo) | 129 (34.5) |
| Ductal – mixed nuclear grades | 29 (7.8) |
| Pure DCIS | |
| Histological typee | 105g |
| Low grade (noncomedo) | 9 (8.5) |
| Intermediate grade | 29 (27.6) |
| High grade (comedo) | 60 (57.1) |
| Ductal – mixed nuclear grades | 7 (6.7) |
DCIS=ductal carcinoma in situ; LN=lymph nodes; NOS=not otherwise specified.
a
Data not available for two cases.
b
Tumours too small to grade (n=13), grade not recorded (n=20).
c
Size was not recorded at review (n=28).
d
LNs were not removed or not reviewed (n=148).
e
Cases with more than one DCIS histological type recorded are included in the highest grade category: n=67 for DCIS with invasive cancer (n=56 included as intermediate grade and n=11 as high grade) and n=23 for the pure DCIS group (n=18 included as intermediate grade and n=5 as high grade).
f
Excludes 198 and 65 cases not graded according to this scheme.
g
Excludes 198 and 65 cases not graded according to this scheme.