Table 1.
Calculation of current TCP for each of the five target subvolumes, see text for details. GTV-PET: the 18F-fluorodeoxyglucose positive gross tumor volume. GTV: gross tumor volume. CTV-t: clinical target volume. CTVE-h: high risk elective clinical target volume. CTVE-l: low risk elective clinical target volume. TCP: tumor control probability.
| Target volume | Mean volume (range) of PTV | Proportion of local failures specific to volume (%) | Crude TCP (%) | Estimated TCP with current prescription (%) |
|---|---|---|---|---|
| GTV-PET | 83 cm3 (14–255 cm3) | 54 | 83.9 | 83.3 |
| GTV | 150 cm3 (45–362 cm3) | 28 | 91.5 | 90.9 |
| CTV-t | 439 cm3 (195–894 cm3) | 14 | 95.8 | 95.1 |
| CTVE-h | 861 cm3 (434–1805 cm3) | 2 | 99.4 | 98.7 |
| CTVE-l | 1080 cm3 (646–1972 cm3) | 0 | 100 | 99.3 |
| Out of field | N/A | 2 | N/A | N/A |