Tumor Response Classifications of PERCIST (2009)
| Classification | Criteria |
| Complete response | Decline of metabolic activity of measureable lesions to below mean liver activity and on a par with background blood-pool activity |
| Partial response | Reduction of peak SUL of ≥30% and 0.8 SUL unit in measurable lesions |
| Stable disease | <30% reduction and 30% increase in peak SUL in measurable lesions |
| Progressive disease | Increase in peak SUL by ≥30% and 0.8 SUL unit in measurable lesions |