Table 1.
Characteristics of the patient cohort.
| Total (%) | Patients underwent surgery | Patients refused surgery | ||
| Variable | 5860 (100.0) | 5810 (99.1) | 50 (0.9) | P value |
| Age | .003∗ | |||
| <50 | 725 (12.4) | 722 (12.4) | 3 (6.0) | |
| 50–64 | 2077 (35.4) | 2066 (35.6) | 11 (22.0) | |
| ≥65 | 3058 (52.2) | 3022 (52.0) | 36 (72.0) | |
| Race | .064 | |||
| White | 4747 (81.5) | 4714 (81.6) | 33 (66.0) | |
| Black | 764 (13.1) | 750 (13.0) | 14 (28.0) | |
| Other | 313 (5.4) | 310 (5.4) | 3 (6.0) | |
| Year of diagnosis | .259 | |||
| 1975–1989 | 701 (12.0) | 697 (12.0) | 4 (9.0) | |
| 1990–2004 | 1826 (31.2) | 1812 (31.2) | 14 (28.0) | |
| 2005–2016 | 3333 (56.9) | 3301 (56.8) | 42 (64.0) | |
| Histology | .006∗,# | |||
| Ductal | 4711 (80.4) | 4680 (80.6) | 31 (62.0) | |
| Papillary | 168 (2.9) | 168 (2.9) | 0 (0) | |
| Others | 981 (16.7) | 962 (16.6) | 19 (38.0) | |
| Marital status | .067 | |||
| Single | 779 (14.0) | 769 (13.9) | 10 (21.7) | |
| Married | 3904 (70.0) | 3889 (70.3) | 15 (32.6) | |
| Separated/Widowed/ Divorced | 893 (16.0) | 872 (15.8) | 21 (45.7) | |
| AJCC stage | <.0001∗,# | |||
| I | 1449 (31.3) | 1449 (31.5) | 0 (0) | |
| II | 2077 (44.9) | 2065 (44.9) | 12 (40.0) | |
| III | 877 (19.0) | 868 (18.9) | 9 (30.0) | |
| IV | 223 (4.8) | 214 (4.7) | 9 (30.0) | |
| Unknown | 1234 (−) | 1214 (−) | 20 (−) | |
| Grade | .627# | |||
| I | 596 (12.1) | 595 (12.1) | 1 (4.4) | |
| II | 2476 (50.2) | 2460 (50.1) | 16 (69.6) | |
| III | 1796 (36.4) | 1790 (36.4) | 6 (26.1) | |
| IV | 68 (1.4) | 68 (1.4) | 0 (0) | |
| Unknown | 924 (−) | 897 (−) | 27 (−) | |
| ER status | .920 | |||
| Positive | 4337 (95.4) | 4314 (95.4) | 23 (95.8) | |
| Negative | 209 (4.6) | 208 (4.6) | 1 (4.2) | |
| Unknown | 1314 (−) | 1288 (−) | 26 (−) | |
| PR status | .907 | |||
| Positive | 3839 (86.1) | 3819 (86.1) | 20 (87.0) | |
| Negative | 619 (13.9) | 616 (13.9) | 3 (13.0) | |
| Unknown | 1402 (−) | 1375 (−) | 27 (−) | |
| Her2 status | .384 | |||
| Positive | 243 (12.6) | 240 (12.5) | 3 (20.0) | |
| Negative | 1690 (87.4) | 1678 (87.5) | 12 (80.0) | |
| Unknown | 3927 (−) | 3892 (−) | 35 (−) | |
| Radiation | <.0001∗ | |||
| No | 4335 (74.0) | 4290 (73.8) | 45 (90.0) | |
| Yes | 1525 (26.0) | 1520 (26.2) | 5 (10.0) |
∗
represent the P value <.05.
#
represent that the P value is performed by Fishe exact test.