Table 2.
Unvariate analysis of factors influencing OS, CSS and DFS
| Factors | No. | 3-year OS (%) | p | 3-year CSS (%) | p | 3-year DFS (%) | p |
|---|---|---|---|---|---|---|---|
| Age (years old) | |||||||
| 70–74 | 44 | 64.0 | 0.7516 | 65.8 | 0.8542 | 66.1 | 0.9648 |
| ≥75 | 29 | 65.8 | 70.0 | 67.5 | |||
| Histology | |||||||
| Squamous cell carcinoma | 68 | 65.9 | 0.3010 | 68.9 | 0.2478 | 67.3 | 0.3806 |
| Other histology | 5 | 50.0 | 50.0 | 60.0 | |||
| Stage | |||||||
| I | 9 | 88.9 | 0.0004 | 88.9 | 0.0074 | 88.9 | <0.0001 |
| II | 44 | 72.6 | 72.6 | 74.8 | |||
| III | 15 | 55.1 | 60.1 | 53.3 | |||
| IV A | 5 | 20.0 | 0 | 0 | |||
| Lymph nodes metastasis | |||||||
| Yes | 11 | 27.3 | <0.0001 | 0 | <0.0001 | 18.2 | <0.0001 |
| No | 62 | 75.1 | 78.7 | 75.5 | |||
| External beam irradiation technique | |||||||
| 3D–CRT | 21 | 57.1 | 0.4969 | 61.2 | 0.5433 | 57.1 | 0.2360 |
| IMRT | 52 | 70.5 | 72.2 | 71.6 | |||
| Concurrent chemotherapy | |||||||
| Yes | 24 | 83.1 | 0.0038 | 87.1 | 0.0061 | 83.3 | 0.0091 |
| No | 49 | 54.3 | 56.8 | 57.6 | |||
Abbreviations: OS Overall survival, CSS Cause-specific survival, DFS Disease-free survival, LNM Lymph nodes metastasis, 3D–CRT 3-Dimensional conformal radiation therapy, IMRT Intensity modulated radiation therapy