Table 3 Validation results, NBCSP screening outcomes compared to the model prediction of NBCSP screening outcomes.
From: The cost-effectiveness of risk-stratified breast cancer screening in the UK
Description of validation target outcomes | NBCSP screening outcomes (target outcomes) | Model prediction | Reference for target outcomes |
|---|---|---|---|
Percentage of tumours that are DCIS at screen detection | 21.1% | 21.58% | Data request to the National Audit of Breast Cancer in Older Patients [24] |
Invasive cancer TNM stage distribution for cancers detected by screening. Percentage in each stage | |||
Stage 1 | 66.00% | 66.97% | |
Stage 2 | 28.89% | 27.84% | |
Stage 3 | 4.19% | 4.34% | |
Stage 4 | 0.091% | 0.85% | |
Size of cancers detected at screening | |||
Less than 20 mm (DCIS) | 62.76% | 55.54% | |
Above 20 mm (DCIS) | 37.24% | 44.46% | |
Less than 20 mm (Invasive) | 66.00% | 56.02% | Table 2 in Breast Screening Frequency Trial Group, 2002 [27] |
Above 20 mm (Invasive) | 34.00% | 43.98% | |
