Table 1.
Patient, tumor and treatment-specific characteristics of the study population.
| Variable | N (%) | |
|---|---|---|
| Age (median = 62 years) | ||
| ≤ 62 years | 3,733 (51.8) | |
| ≥ 63 years | 3,474 (48.2) | |
| Sex | ||
| Male | 72 (1.0) | |
| Female | 7,135 (99) | |
| Race/Ethnicity | ||
| Asian | 462 (6.4) | |
| Black | 270 (3.6) | |
| Hispanic | 599 (8.3) | |
| Native American | 28 (0.4) | |
| White | 5,807 (80.6) | |
| Unknown | 41 (0.6) | |
| County Category | ||
| Rural | 248 (3.4) | |
| Near-Metro | 2,726 (37.8) | |
| Urban | 4,233 (58.7) | |
| T stage | ||
| T0 | 3 (0.1) | |
| T1 | 3,763 (52.2) | |
| T2 | 2,535 (35.1) | |
| T3 | 501 (7) | |
| T4 | 160 (2.2) | |
| TX | 245 (3.4) | |
| N Stage | ||
| N0 | 3,930 (54.5) | |
| N1 | 1,892 (26.3) | |
| N2 | 771 (10.7) | |
| N3 | 369 (5.1) | |
| NX | 245 (3.4) | |
| Tumor Grade | ||
| I | 1,352 (18.7) | |
| II | 2,890 (40.1) | |
| III | 2,217 (30.8) | |
| IV | 107 (1.5) | |
| Unknown | 641 (8.9) | |
| Histology | ||
| IDC | 5,632 (78.2) | |
| ILC | 798 (11.1) | |
| MDLC | 777 (10.8) | |
| Estrogen Receptor Status | ||
| Positive | 4,918 (68.2) | |
| Negative | 1,402 (19.5) | |
| Equivocal | 21 (0.3) | |
| Unknown | 866 (12.0) | |
| Progesterone Receptor Status | ||
| Positive | 4,078 (56.6) | |
| Negative | 2,160 (30.0) | |
| Equivocal | 86 (1.2) | |
| Unknown | 883 (12.3) | |
| Mastectomy | ||
| Unilateral | 7,055 (97.9) | |
| Bilateral | 152 (2.1) | |
| Breast Reconstruction | ||
| Yes | 718 (10.0) | |
| No | 2,834 (39.3) | |
| Unknown | 3,655 (50.7) | |
| Radiation | ||
| Yes | 1,296 (18.0) | |
| No | 5,693 (79.0) | |
| Unknown | 218 (3.0) |