Table 2.
Characteristics of the screen-detected cancers by timeliness and risk factor grouping.
| Characteristics | None of the RFs∗ |
At least one RF∗ |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| timely screens (<27mo) |
Delayed screens (≥27mo) |
timely screens (<27mo) |
Delayed screens (≥27mo) |
||||||
| N | % | N | % | N | % | N | % | ||
| Pathological tumour size category | |||||||||
| pTis (DCIS) | 364 | 23.2% | 159 | 20.6% | 551 | 22.5% | 183 | 19.6% | |
| pT1a (≤5 mm) | 117 | 7.5% | 44 | 5.7% | 202 | 8.3% | 54 | 5.8% | |
| pT1b (>5 mm, ≤10 mm) | 327 | 20.9% | 161 | 20.9% | 502 | 20.5% | 152 | 16.2% | |
| pT1c (>10 mm, ≤20 mm) | 526 | 33.5% | 275 | 35.7% | 787 | 32.2% | 306 | 32.7% | |
| pT2 (>20 mm, ≤50 mm) | 219 | 14.0% | 117 | 15.2% | 362 | 14.8% | 210 | 22.4% | |
| pT3 (>50 mm) | 15 | 1.0% | 14 | 1.8% | 40 | 1.6% | 31 | 3.3% | |
| Unknown | 8 | . | 1 | . | 8∗∗ | . | 7 | . | |
| Total | 1568 | 770 | 2444 | 936 | |||||
| Axillary nodal status (invasive cancer) | |||||||||
| Negative for metastasis | 856 | 77.3% | 408 | 73.9% | 1342 | 79.3% | 507 | 72.9% | |
| Positive for metastasis | 251 | 22.7% | 144 | 26.1% | 351 | 20.7% | 188 | 27.1% | |
| Unknown | 105 | . | 60 | . | 208 | . | 64 | . | |
| Total | 1107 | 552 | 1693 | 695 | |||||
RF, risk factor; DCIS, ductal carcinoma in situ. ∗first-degree family history of breast cancer, HRT use, history of benign breast conditions, and self-reporting symptoms. Breast density was not included. ∗∗1 was also unclear whether it was DCIS or invasive.