Table 1 Comparison of clinical and pathological features between colorectal cancer patients with and without multiple primary malignancies
| Â | Colorectal cancer without multiple primary malignancies | Colorectal cancer with multiple primary malignancies | P a |
|---|---|---|---|
( n  = 994: 89.5%) | ( n  = 117: 10.5%) |  | |
Age (years):b | 68 (29 to 96) | 71 (50 to 92) | <0.001c |
<50 | 79 (100) | 0 (0) | 0.002 |
≥50 | 915 (88.7) | 117 (11.3) |  |
Sex: | Â | Â | 0.26 |
Male | 627 (88.7) | 80 (11.3) | Â |
Female | 367 (90.8) | 37 (9.2) | Â |
Tumor location: | Â | Â | 0.345 |
Colon | 778 (89.0) | 96 (11.0) | Â |
Rectum | 216 (91.1) | 21 (8.9) | Â |
Differentiation: | Â | Â | 0.678 |
Well or moderate | 981 (89.4) | 116 (10.6) | Â |
Poor | 13 (92.9) | 1 (7.1) | Â |
TNM stage: | Â | Â | 0.036 |
I | 247 (87.0) | 37 (13.0) | Â |
II | 333 (87.6) | 47 (12.4) | Â |
III | 295 (91.9) | 26 (8.1) | Â |
IV | 119 (94.4) | 7 (5.6) | Â |