Primary tumor site in patients according to their MMR status detected by IHC
| Tumor site | MMR-proficient families | MMR-deficient families | |||
| Frequency | Percent | Frequency | Percent | ||
| Cecum | 3 | 12.5 | 1 | 14.3 | |
| Ascending colon | 2 | 8.3 | 2 | 28.6 | |
| Transverse colon | 0 | 0.0 | 1 | 14.3 | |
| Descending colon | 0 | 0.0 | 2 | 28.6 | |
| Sigmoid colon | 8 | 33.3 | 1 | 14.3 | |
| Rectum | 10 | 41.7 | 0 | 0.0 | |
| Unknown | 1 | 4.2 | 0 | 0.0 | |
| Total | 24 | 100.0 | 7 | 100.0 | |