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Table 2 Univariate analysis of prognostic factors for OS of 153 patients

From: Salvage surgery for neck residue or recurrence of nasopharyngeal carcinoma after primary radiotherapy: options of surgical methods and regions

Parameter Cases observed OS χ 2 value P
3-year (%) 5-year (%)
Age (year)      
 ≤50 90 71.5 55.5   
 >50 63 39.4 22.8 13.360 0.000
Gender      
 Male 128 57.1 42.9   
 Female 25 59.2 23.7 1.401 0.237
Status of LN      
 Recurrence 105 59.5 43.1   
 Residue 48 50.9 33.9 1.642 0.200
rN stage      
 N1 109 67.7 47.0   
 N2 17 44.9 36.0   
 N3 27 20.7 15.6 40.152 0.000
Size of LN      
 ≤3 cm 80 67.5 52.4   
 3~6 cm 47 58.9 34.7   
 >6 cm 26 21.5 16.2 40.012 0.000
Bilateral of LN      
 Yes 17 44.9 36.0   
 NO 136 58.5 40.9 0.005 0.943
ECS      
 Yes 111 51.8 35.7   
 No 42 71.3 54.8 6.189 0.013
Level 1 or parotid metastasis      
 Yes 27 54.8 38.4   
 No 126 57.6 41.0 0.085 0.771
Surgical procedure      
 MRND 89 66.3 47.9   
 RND/ERND 64 44.3 30.5 11.823 0.001