Assessment of GIST Response to Imatinib Based on WHO and RECIST Criteria
| Response | Criteria | ||
|---|---|---|---|
| WHO | RECIST | ||
| Complete response | No lesions detectable on follow-up | No lesions detectable on follow-up | |
| Partial response | Target sum reduction of ≥50% | Target sum reduction of ≥30% | |
| No change | |||
| Minor response | Target sum reduction of >25% but <50% | Target sum reduction of <30%, unchanged, or increase of <20% | |
| Stable disease | Target sum reduction of <25%, unchanged, or increase of ≤25% | Target sum reduction of <30%, unchanged, or increase of <20% | |
| Progressive disease | Target sum increase of >25% | Target sum increase of ≥20% | |