Table 2.
Breast Cancer Rate per 1000 person-years by Screening Mammogram Result and Breast Density, Breast Cancer Surveillance Consortium
| Prior Mammogram Result / Recommendation |
Number breast cancer cases |
Person years at risk |
Breast cancer rate (95%CI) per 1000 P-Y |
|---|---|---|---|
| ALL WOMEN: | |||
| True-negative | 43,105 | 11,034,496 | 3.91 (3.87, 3.94) |
| False-positive, additional imaging | 4,742 | 861,365 | 5.51 (5.35, 5.66) |
| False-positive, biopsy | 888 | 126,699 | 7.01 (6.56, 7.48) |
| BY BI-RADS BREAST DENSITY: | |||
| ALMOST ENTIRELY FAT | |||
| True-negative | 2,206 | 993,559 | 2.22 (2.13, 2.31) |
| False-positive, additional imaging | 123 | 33,291 | 3.69 (3.07, 4.41) |
| False-positive, biopsy | 23 | 5,774 | 3.98 (2.53, 5.97) |
| SCATTERED FIBROGLANDULAR DENSITY | |||
| True-negative | 17,884 | 5,070,911 | 3.53 (3.37, 3.47) |
| False-positive, additional imaging | 1,737 | 355,192 | 4.89 (4.51, 4.95) |
| False-positive, biopsy | 315 | 52,612 | 5.99 (5.09, 6.36) |
| HETEROGENEOUSLY DENSE | |||
| True-negative | 19,014 | 4,143,830 | 4.59 (4.52, 4.65) |
| False-positive, additional imaging | 2,372 | 398,280 | 5.96 (5.72, 6.20) |
| False-positive, biopsy | 448 | 56,984 | 7.86 (7.15, 8.62) |
| EXTREMELY DENSE | |||
| True-negative | 4,001 | 826,197 | 4.84 (4.69, 4.99) |
| False-positive, additional imaging | 510 | 74,602 | 6.84 (6.26, 7.45) |
| False-positive, biopsy | 102 | 11,329 | 9.00 (7.35, 10.92) |
BI-RADS = Breast Imaging-Reporting and Data System; CI = confidence interval; P-Y = person years