Accuracy of Follow-up PET/CT Between 4 and 24 Months After Treatment
| Biopsy or 3-mo follow-up | |||
| PET/CT finding | Positive | Negative | Total |
| Positive | 22 | 19 | 41 |
| Negative | 4 | 182 | 186 |
| Total | 26 | 201 | 227 |
Histopathology or 3-mo clinical follow-up was used as reference standard. Sensitivity, specificity, positive predictive value, and negative predictive value of follow-up PET/CT 4–24 months after treatment for HNSCC were 84.6%, 90.5%, 53.6%, and 97.8%, respectively.