Table 1. MSI status varies based on characteristics of enrolled patients.
| Characteristics | Overall (n=1,156) | MSS (n=1,071; 92.65%) | MSI-H (n=85; 7.35%) | P-value | |
|---|---|---|---|---|---|
| Age (years) | 57.8±11.6 | 56.7±11.5 | 63.4±10.7 | <0.001 | |
| Sex | <0.001 | ||||
| Male | 759 (65.7) | 720 (67.2) | 39 (45.9) | ||
| Female | 397 (34.3) | 351 (32.8) | 46 (54.1) | ||
| Location | <0.001 | ||||
| Upper-third | 95 (8.2) | 92 (8.6) | 3 (3.5) | ||
| Middle-third | 352 (30.5) | 339 (31.7) | 13 (15.3) | ||
| Lower-third | 708 (61.3) | 639 (59.7) | 69 (81.2) | ||
| Size (mm) | 26.8±15.6 | 26.7±15.6 | 28.3±15.7 | 0.381 | |
| Histology | <0.001 | ||||
| Differentiated | 588 (51.6) | 527 (50.0) | 61 (71.8) | ||
| Undifferentiated | 552 (48.4) | 528 (50.0) | 24 (28.2) | ||
| Lauren classification | 0.002 | ||||
| Intestinal | 570 (49.3) | 516 (48.2) | 54 (63.5) | ||
| Diffuse | 370 (32.0) | 357 (33.3) | 13 (15.3) | ||
| Others | 147 (12.7) | 186 (17.4) | 18 (21.2) | ||
| pT stage (%) | 0.007 | ||||
| Mucosa | 585 (50.6) | 554 (51.7) | 31 (36.5) | ||
| Submucosa | 571 (49.4) | 517 (48.3) | 54 (63.5) | ||
| No. of resected LN | 37.44±14.49 | 37.58±14.34 | 35.73±16.24 | 0.258 | |
| LN metastasis (%) | 0.056 | ||||
| Yes | 131 (11.3) | 116 (10.8) | 15 (17.6) | ||
| No | 1,025 (88.7) | 955 (89.2) | 70 (82.4) | ||
| No. of metastatic LN | 0.3±1.5 | 0.3±1.5 | 0.4±1.4 | 0.473 | |
| LVI | 0.001 | ||||
| Yes | 992 (85.8) | 142 (13.3) | 22 (25.9) | ||
| No | 164 (14.2) | 929 (86.7) | 63 (74.1) | ||
Values are expressed as mean±standard deviation or number (%).
MSI = microsatellite instability; MSS = microsatellite stable; MSI-H = microsatellite instability-high; LN = lymph node; LVI = lymphovascular invasion.