Table 5 Multivariate analyses of factors on regional recurrence-free survival and overall survival (node-positive patients of low-risk group)
Factor | Regional control | Overall survival | ||||||
|---|---|---|---|---|---|---|---|---|
P value | HR | 95% CI | P value | HR | 95% CI | |||
Low-risk group | ||||||||
 Age (≤ 50y; > 50y) | 0.486 | 0.461 | 0.052 | 4.077 | 0.707 | 1.225 | 0.426 | 3.521 |
 Gender (M/F) | 0.735 | 0.630 | 0.044 | 9.121 | 0.920 | 1.057 | 0.361 | 3.092 |
 T (T1/T2/T3/T4) | 0.298 | 2.064 | 0.527 | 8.089 | 0.046* | 1.776 | 1.010 | 3.125 |
 N (N1/N2/N3) | 0.015* | 10.370 | 1.577 | 68.215 | 0.302 | 1.578 | 0.663 | 3.755 |
 Nodal necrosis (no/yes) | 0.718 | 0.535 | 0.018 | 15.953 | 0.143 | 2.267 | 0.758 | 6.782 |
 Chemotherapy (no/yes) | 0.177 | 0.105 | 0.004 | 2.760 | 0.295 | 0.449 | 0.100 | 2.009 |
 Elective IB irradiation (no/yes) | 0.971 | 1.056 | 0.055 | 20.353 | 0.452 | 1.547 | 0.496 | 4.832 |
 Boost irradiation of Lymph nodes (no/yes) | 0.993 | 0.000 | 0.000 | not reach | 0.773 | 1.374 | 0.158 | 11.972 |