Table 2 IMA-LN and pathological parameters
|  | Case (n) | IMA-LN | χ2 value | P value | |
|---|---|---|---|---|---|
Metastasis (n) | Metastasis rate (%) | ||||
Tumor size(cm) | |||||
 ≤4 | 262 | 11 | 4.2 | 3.215 | 0.073 |
 >4 | 223 | 18 | 8.1 | ||
Pathological type | |||||
 ADC | 408 | 20 | 4.9 | 5.306 | 0.021* |
 MC/SRCC | 77 | 9 | 11.7 | ||
Differentiation | |||||
 Well/moderate | 384 | 12 | 3.1 | 26.724 | <0.0001* |
 Poor | 101 | 17 | 15.9 | ||
Nerve invasion | |||||
 No | 381 | 11 | 2.9 | 30.22 | <0.0001* |
 Yes | 104 | 18 | 17.3 | ||
LN harvest number | |||||
 <12 | 138 | 7 | 5.1 | 0.282 | 0.595 |
 ≥12 | 347 | 22 | 6.3 | ||
Microsatellite status | |||||
 Stable | 440 | 25 | 5.7 | 0.747 | 0.387 |
 Unstable | 45 | 4 | 8.9 | ||
Ras phenotype | |||||
 Wild | 289 | 17 | 5.8 | 0.012 | 0.918 |
 Mutant | 196 | 12 | 6.1 | ||
T stage | |||||
 Tis or 1 | 16 | 0 | 0 | 35.72 | <0.0001* |
 2 | 40 | 1 | 2.5 | ||
 3 | 286 | 12 | 4.2 | ||
 4a | 143 | 16 | 11.2 | ||
N stage | |||||
 0 | 206 | 0 | 0 | 10.43 | 0.015* |
 1 | 162 | 13 | 8.0 | ||
 2 | 117 | 16 | 13.7 | ||