Table 3.
Subgroup analysis of tumor response.
| Factors | Group | n | Local control rate (%) | p | |||
|---|---|---|---|---|---|---|---|
| 1-y | 2-y | 3-y | 5-y | ||||
| Age (years old) | <60 | 66 | 53.7 | 38.5 | 24.9 | 11.3 | 0.311 |
| ≥60 | 47 | 62.4 | 46.3 | 35.6 | 20.8 | ||
| KPS | <80 | 23 | 41.6 | 20.8 | – | – | 0.003 |
| ≥80 | 90 | 61.4 | 47.9 | 33.5 | 17.4 | ||
| Implantation site | Primary tumor | 69 | 55.3 | 40.9 | 30.1 | 12.5 | 0.738 |
| Lymph nodes | 44 | 60.8 | 43.6 | 27.7 | 15.8 | ||
| D90 (Gy) | ≤90 | 16 | 17.2 | – | – | – | 0.000 |
| >90, ≤130 | 44 | 61.5 | 35.3 | 13.3 | – | ||
| >130 | 53 | 64.8 | 54.6 | 46.8 | 26.0 | ||
| Previous surgery | Yes | 65 | 65.1 | 48.2 | 30.7 | 13.1 | 0.582 |
| No | 48 | 46.9 | 32.8 | 24.6 | 15.4 | ||
| Previous radiotherapy | Yes | 103 | 56.6 | 43.7 | 30.6 | 15.9 | 0.511 |
| No | 10 | 58.0 | – | – | – | ||
| Previous chemotherapy/target therapy | Yes | 62 | 55.7 | 43.1 | 30.4 | 15.2 | 0.697 |
| No | 51 | 58.9 | 40.6 | 28.1 | 15.6 | ||