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Table 3 Log-rank tests of clinicopathologic factors, conventional PET parameters, and significant texture features for PFS

From: Texture analysis of pretreatment [18F]FDG PET/CT for the prognostic prediction of locally advanced salivary gland carcinoma treated with interstitial brachytherapy

Factors or parameters Number (%) Value of parameters (mean ± standard deviation) 3-year PFS rates P value
Tumor site     0.057
 Major salivary gland    72.3%  
 Minor salivary gland    31.5%  
N classification     0.122
 N0    56.1%  
 N+    44.4%  
M classification     0.217
 M0    61.9%  
 M1    32.6%  
Histologic grade     0.855
 High grade    33.2%  
 Low grade    80.0%  
Primary or recurrent tumor     0.352
 Primary tumor    63.6%  
 Recurrent tumor    41.5%  
SUVmax (g/cm3)     0.455
 ≤ 2.92 15 (35%) 2.36 ± 0.10 37.1%  
 > 2.92 28 (65%) 6.27 ± 0.54 67.6%  
MTV (cm3)     0.496
 ≤ 57.27 33 (77%) 22.46 ± 2.45 59.6%  
 > 57.27 10 (23%) 101.52 ± 9.09 34.3%  
TLG (g)     0.246
 ≤ 37.95 14 (33%) 21.39 ± 2.54 50.2%  
 > 37.95 29 (67%) 133.61 ± 18.09 56.7%  
Minimum intensity     0.019*
 ≤ 4403 30 (70%) 2813.37 ± 178.48 57.5%  
 > 4403 13 (30%) 6017.31 ± 414.55 0  
Mean intensity     0.027*
 ≤ 6328 25 (58%) 4015.43 ± 258.37 61.1%  
 > 6328 18 (42%) 9426.24 ± 639.15 23.7%  
Median intensity     0.027*
 ≤ 6119 26 (60%) 3815.35 ± 254.19 61.1%  
 > 6119 17 (40%) 8942.24 ± 598.51 23.7%  
Root mean square     0.027*
 ≤ 6431 26 (60%) 4119.35 ± 262.72 61.1%  
 > 6431 17 (40%) 9752.68 ± 681.31 23.7%  
Long run emphasis     0.012*
 ≤ 3.79 34 (79%) 2.17 ± 0.13 0  
 > 3.79 9 (21%) 5.96 ± 0.93 66.3%  
  1. PET positron emission tomography, PFS progression-free survival, SUVmax maximum standardized uptake value, MTV metabolic tumor volume, TLG total lesion glycolysis, "*" represents P<0.05