Table 1.
Stepwise inclusion and exclusion counts.
| Removal criterion | Removed | Remaining |
|---|---|---|
| 1975 to 2016 MBC patients | 0 (0.0%) | 4,672 |
| Exclude men | 9 (0.2%) | 4,663 |
| Exclude patients younger than >18 years and <90 years | 132 (2.8%) | 4,531 |
| Exclude patients who did not receive a mastectomy or lumpectomy | 515 (11.3%) | 4,016 |
| Exclude those with unknown tumor size or if size = 0 | 8 (0.2%) | 4,008 |
| Exclude patients with borderline ER | 11 (0.3%) | 3,997 |
| Exclude patients with borderline PR | 7 (0.2%) | 3,990 |
| Excluded patients without receipt of combination of beam with implants or isotopes; radiation, NOS method or source not specified; radioactive implants (includes brachytherapy) | 62 (1.6%) | 3,928 |
| Exclude patients who did not have a histologically confirmed diagnosis | 12 (0.3%) | 3,916 |
| Exclude patients who received neoadjuvant radiation or radiation status unknown | 24 (0.6%) | 3,892 |
| Year of diagnose after 2000 | 144 (3.7%) | 3,748 |
| Final data set | 0 (0.0%) | 3,748 |
MBC, metaplastic breast cancer; ER, estrogen receptor; PR, progesterone receptor; TNBC, triple negative breast cancer.