Table 1.
Characteristics of the cohort by receipt of AC.
| No Adjuvant Chemotherapy (n=46656) | Adjuvant Chemotherapy (n=9268) | Chi Square P | ||
|---|---|---|---|---|
| n (%) | ||||
| Age | <65 years | 15309 (32.8) | 6298 (68) | <0.001 |
| >65 years | 31347 (67.2) | 2970 (32) | ||
| Sex | Male | 22246 (47.7) | 4737 (51.1) | <0.001 |
| Female | 24410 (52.3) | 4531 (48.9) | ||
| Race | White | 38985 (83.6) | 7505 (81) | <0.001 |
| Black | 5349 (11.5) | 1274 (13.7) | ||
| Asian/Polynesian | 1463 (3.1) | 307 (3.3) | ||
| Other/Unknown | 859 (1.8) | 182 (2) | ||
| Hispanic | No | 42876 (94.6) | 8306 (92.3) | <0.001 |
| Yes | 2437 (5.4) | 695 (7.7) | ||
| Insurance Status | Insured | 44648 (96.8) | 8552 (93.5) | <0.001 |
| Uninsured | 1454 (3.2) | 593 (6.5) | ||
| CDC Score | 0 | 30268 (64.9) | 6993 (75.5) | <0.001 |
| 1 | 10990 (23.6) | 1772 (19.1) | ||
| 2 | 3531 (7.6) | 369 (4) | ||
| 3 | 1867 (4) | 134 (1.4) | ||
| Tumor Size | < 5cm | 20315 (43.5) | 3310 (35.7) | <0.001 |
| >= 5cm | 19684 (42.2) | 4696 (50.7) | ||
| Unknown | 6657 (14.3) | 1262 (13.6) | ||
| T Stage | T3 | 42003 (90.3) | 5840 (63.5) | <0.001 |
| T4A | 2811 (6) | 1783 (19.4) | ||
| T4B | 1722 (3.7) | 1571 (17.1) | ||
| Grade | Grade 1–2 | 39573 (84.8) | 7403 (79.9) | <0.001 |
| Grade 3–4 | 7083 (15.2) | 1865 (20.1) | ||
| Lymphovascular Invasion | No | 40647 (87.1) | 7228 (78) | <0.001 |
| Yes | 6009 (12.9) | 2040 (22) | ||
| Perineural Invasion | No | 43668 (93.6) | 8134 (87.8) | <0.001 |
| Yes | 2988 (6.4) | 1134 (12.2) | ||
| Lymph Node Harvest | >12 nodes | 43568 (93.4) | 8440 (91.1) | <0.001 |
| <12 nodes | 3088 (6.6) | 828 (8.9) | ||
| Margin | Negative | 45546 (97.6) | 8480 (91.5) | <0.001 |
| Positive | 1110 (2.4) | 788 (8.5) | ||
| Location | Right Colon | 24597 (54.2) | 3634 (40.4) | <0.001 |
| Transverse Colon | 5409 (11.9) | 966 (10.7) | ||
| Left Colon | 4690 (10.3) | 1216 (13.5) | ||
| Sigmoid Colon | 10693 (23.6) | 3177 (35.3) | ||