Microsatellite instability (MSI) in non-neoplastic epithelium
| Group | Matts's score | No. of samples | MSI ≥1 locus | MSI ≥2 loci |
|---|---|---|---|---|
| UC-LD, ulcerative colitis of long duration; UC-SD, ulcerative colitis of short duration. | ||||
| UC-LD with neoplasm | 1 or 2 | 19 | 11 (58%) | 1 (5%) |
| 3 or 4 | 4 | 2 (50%) | 1 (25%) | |
| Total | 23 | 13 (57%) | 2 (9%) | |
| UC-LD without neoplasm | 1 or 2 | 5 | 1 (20%) | 0 |
| 3 or 4 | 9 | 9 (100%) | 6 (67%) | |
| Total | 14 | 10 (71%) | 6 (49%) | |
| UC-SD | 1 or 2 | 3 | 1 (33%) | 0 |
| 3 or 4 | 9 | 7 (78%) | 1 (11%) | |
| Total | 12 | 8 (67%) | 1 (8%) | |