Table 1. Demographic information and histopathological characteristics of Han Chinese patients with and without colorectal cancer.
| Caseb | Control | |
| Characteristics | No. (%) | No. (%) |
| Gender | ||
| Male | 155 (50.8) | 182 (53.2) |
| Female | 150 (49.2) | 160 (46.8) |
| Age | ||
| ≤50 years old | 50 (16.4) | 227 (66.4) |
| >50 years old | 255 (83.6) | 115 (33.6) |
| Tumor location | ||
| colon | 136 (45.3) | – |
| Rectum | 162 (54.0) | – |
| Colon and Rectum | 2 (0.7) | – |
| Differentiation | ||
| Good | 27 (9.0) | – |
| Moderate | 234 (78.0) | – |
| Poor | 35 (11.7) | – |
| ND | 4 (1.3) | – |
| T stagea | ||
| T0 | 2 (0.7) | – |
| T1 | 3 (1.0) | – |
| T2 | 49 (16.3) | – |
| T3 | 83 (27.7) | – |
| T4 | 163 (54.3) | – |
| N stagea | ||
| N0 | 190 (63.3) | – |
| N1 | 69 (23.0) | – |
| N2 | 41 (13.7) | – |
| M stagea | ||
| M0 | 258 (86.0) | – |
| M1 | 42 (14.0) | – |
a
The stage of cancer was classified following the 7th edition of AJCC Cancer Staging Handbook [21].
b
Among all 305 cases, five cases lacked histopathological data.