Table 1.
Clinical characteristics of NPC patients (n = 60)
| Characteristics | Inside-field recurrence (n = 20) | Without recurrence (n = 40) |
|---|---|---|
| No. of cases (%) | No. of cases (%) | |
| Gender | ||
| Male | 15(75%) | 30(75%) |
| Female | 5(25%) | 10(25%) |
| WHO Histologic type | ||
| IIa | 4(20%) | 8(20%) |
| IIb | 16(80%) | 32(80%) |
| T classification | ||
| T1 | 2(10%) | 5(13%) |
| T2 | 8(40%) | 16(40%) |
| T3 | 7(35%) | 15(38%) |
| T4 | 3(15%) | 4(9%) |
| N classification | ||
| N1 | 1(5%) | 6(15%) |
| N2 | 16(80%) | 28(70%) |
| N3 | 3(15%) | 6(15%) |
| Clinical stage | ||
| I | 0(0%) | 0(0%) |
| II | 1(5%) | 2(5%) |
| III | 14(70%) | 28(70%) |
| IVa+IVb | 5(25%) | 10(25%) |
| Neoadjuvant chemotherapy | ||
| Yes | 17(85%) | 32(80%) |
| No | 3(15%) | 8(20%) |
| Concurrent chemotherapy | ||
| Yes | 13(65%) | 25(62%) |
| No | 7(35%) | 15(38%) |
| PTV-GTVt dose | ||
| ≥70Gy | 18(90%) | 36(90%) |
| <70Gy | 2(10%) | 4(10%) |
| Radiotherapy modality | ||
| IMRT | 20(100%) | 40(100%) |
| 3D-CRT or 2D | 0 | 0 |