Table 1.
Comparison of right-sided and left-sided colon cancer in the study cohort.
| Variable | Left-sided colon cancer (n = 41,691) | Right-sided colon cancer (n = 45,664) | P-value |
|---|---|---|---|
| Female | 18,708 (44.9) | 23,620 (51.7) | <0.001 |
| Age, years, median (IQR) | 61 (52–70) | 67 (58–75) | <0.001 |
| Racea, n (%) | <0.001 | ||
| Black | 4,612 (11.1) | 6,295 (13.8) | |
| White | 31,325 (75.6) | 35,407 (77.9) | |
| Other | 5,500 (13.3) | 3,767 (8.3) | |
| Histology, n (%) | <0.001 | ||
| Adenocarcinoma | 39,266 (94.2) | 40,292 (88.2) | |
| Mucinous adenocarcinoma | 2,148 (5.2) | 4,744 (10.4) | |
| Signet-ring cell adenocarcinoma | 277 (0.7) | 628 (1.4) | |
| Chemotherapy, n (%) | <0.001 | ||
| No/unknown | 21,825 (52.3) | 28,012 (61.3) | |
| Yes | 19,866 (47.7) | 17,652 (38.7) | |
| Size, cm, median (IQR) | 4.10 (2.90–5.80) | 4.50 (3.00–6.40) | <0.001 |
| Gradeb, n (%) | <0.001 | ||
| High/moderate | 34,628 (85.7) | 34,202 (76.8) | |
| Poor/anaplastic | 5,764 (14.3) | 10,356 (23.2) | |
| AJCC stage, n (%) | <0.001 | ||
| I | 8,816 (21.1) | 9,668 (21.2) | |
| II | 11,130 (26.7) | 14,545 (31.9) | |
| III | 14,549 (34.9) | 14,305 (31.3) | |
| IV | 7,196 (17.3) | 7,146 (15.6) |
AJCC = American Joint Committee on Cancer, IQR = interquartile range.
a
Due to the missing data, the total is 86,906.
b
Due to the missing data, the total is 84,950.