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Table 1 Characteristics of the non-oligometastatic patient cohort before and after PSM

From: Might radiation therapy in addition to chemotherapy improve overall survival of patients with non-oligometastatic Stage IV non-small cell lung cancer?: Secondary analysis of two prospective studies

Variable Pre-PSM Cohort Post-PSM Cohort
<63 Gy ≥63Gy P value <63 Gy ≥63Gy P value
Total 93 90   59 59  
Gender       
 Male 66 59 0.431 47 38 0.065
 Female 27 31 12 21  
Age (years)       
 <60 years 52 48 0.726 31 27 0.461
 ≥60 years 41 42 28 32  
KPS Score       
 ≤80 58 52   32 32  
 >80 35 38 0.526 27 27 1.000
Pathological type       
 Squamous carcinoma 35 24 0.048 24 20 0.651
 adenocarcinoma 47 61 30 35  
 Other 11 5   5 4  
T status       
 T1-2 33 36 0.529 19 22 0.562
 T3-4 60 54 40 37  
N status       
 N0-1 11 14 0.463 5 12 0.066
 N2-3 82 76 54 47  
Response to chemotherapy       
 Yes 64 68   43 43 1.000
 No 29 22 0.309 16 16  
No. of chemotherapy cycles       
 <4 63 32 <0.001 30 30 1.000
 ≥4 30 58   29 29  
GTV volume (cm3)       
 <146 44 40 0.697 23 23 1.000
 ≥146 49 50 36 36  
Metastasis status       
 Single organ 37 41 0.430 23 27 0.456
 2 to 3 organs 56 49 36 32