Table 3.
Clinicopathological data of GIST patients according to the presence of codon 557/558 deletion/insertion mutations
| Variable | Wt (%) | 557/558 mutations (%) | Non 557/558 mutations (%) | P |
| Age (yr) | 61.7 | 67.2 | 62.5 | NS |
| Size (cm) | 8.2 | 11.3 | 4.4 | 0.025 |
| Mitoses | ||||
| Low (≤ 5/50 HPF) | 71.4 | 50 | 87.5 | NS |
| Intermediate | 21.4 | 37.5 | 12.5 | |
| 5-10/50 HPF | ||||
| High (> 10/50 HPF) | 7.1 | 12.5 | ||
| Differentiation | ||||
| Epithelioid | 7.1 | 25 | NS | |
| Spindle cell | 57.1 | 50 | 100 | |
| Mixed type 1 | 14.3 | 25 | ||
| Mixed type 2 | 21.4 | |||
| Risk assessment | ||||
| Benign | 25 | 0.003 | ||
| Very low malignant potential | 57.1 | 12.5 | ||
| Low malignant potential | 7.1 | 12.5 | 37.5 | |
| Low moderate malignant potential | 14.3 | |||
| Malignant potential | 21.4 | 87.5 | 25 |