Table 1.
Baseline characteristics of patients with occult breast cancer (OBC).
| Characteristic | Cases | % | |
|---|---|---|---|
| Age at diagnosis | <50 | 142 | 15.67% |
| 50–59 | 247 | 27.26% | |
| 60–69 | 252 | 27.81% | |
| 70–79 | 173 | 19.09% | |
| 80+ | 92 | 10.15% | |
| Months from diagnosis to therapy | 0 month | 449 | 49.56% |
| ≥1 month | 377 | 41.61% | |
| unknown | 80 | 8.83% | |
| Subtype | HR+/HER2− | 376 | 41.50% |
| HR+/HER2+ | 107 | 11.81% | |
| HR−/HER2+ | 76 | 8.39% | |
| HR−/HER2− | 146 | 16.11% | |
| unknown | 201 | 22.19% | |
| Race | white | 731 | 80.68% |
| black | 95 | 10.49% | |
| other | 74 | 8.17% | |
| unknown | 6 | 0.66% | |
| Histological type | IDC | 277 | 30.57% |
| ILC | 78 | 8.61% | |
| other | 551 | 60.82% | |
| Marital status | married | 452 | 49.89% |
| singled | 134 | 14.79% | |
| divorced/other | 145 | 16.00% | |
| widowed | 145 | 16.00% | |
| unknown | 30 | 3.31% | |
| N stage | N0 | 172 | 18.98% |
| N1 | 482 | 53.20% | |
| N2 | 75 | 8.28% | |
| N3 | 104 | 11.48% | |
| unknown | 73 | 8.06% | |
| Grade | I; well differentiated | 6 | 0.66% |
| II; moderate differentiated | 28 | 3.09% | |
| III/IV; poorly differentiated | 129 | 14.24% | |
| unknown | 743 | 82.01% | |
| Median household income (inflation ajusted) | <44,999$ | 73 | 8.06% |
| 45,000–54,999$ | 121 | 13.36% | |
| 55,000–64,999$ | 215 | 23.73% | |
| 65,000–74,999$ | 208 | 22.96% | |
| 75,000$+ | 289 | 31.90% | |
| Chemotherapy | no/unknown | 325 | 35.87% |
| yes | 581 | 64.13% | |
| Radiotherapy | no/unknown | 510 | 56.29% |
| yes | 396 | 43.71% | |
| Surgery | no | 676 | 74.61% |
| yes | 222 | 24.50% | |
| unknown | 8 | 0.88% | |
| Bone metastases | no | 612 | 67.55% |
| yes | 270 | 29.80% | |
| unknown | 24 | 2.65% | |
| Liver metastases | no | 798 | 88.08% |
| yes | 81 | 8.94% | |
| unknown | 27 | 2.98% | |
| Lung metastases | no | 789 | 87.09% |
| yes | 90 | 9.93% | |
| unknown | 27 | 2.98% | |
| Brain metastases | no | 838 | 92.49% |
| yes | 39 | 4.30% | |
| unknown | 29 | 3.20% |