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Table 4 Univariate and multivariate analysis results of local control rates

From: Clinical outcomes of stage I and IIA non-small cell lung cancer patients treated with stereotactic body radiotherapy using a real-time tumor-tracking radiotherapy system

Variables Local Control Rates (%) Univariate Analysis Multivariate Analysis
n 2-year 3-year p-value HR (95%CI) p-value
T stage T1a + T1b 195 84 79 0.1263 - 0.5903
T2a + T2b 91 74 64   1.173 (0.647–2.076)  
Histology Adenocarcinoma 185 87 80 0.0002 - 0.0044
SCC 80 65 62   2.366 (1.311–4.301)  
Gender Female 69 88 85 0.0595 - 0.2307
Male 217 79 71   1.595 (0.751–3.700)  
Location Upper and Middle 167 82 76 0.8487 - 0.8845
Lower 119 79 73   1.042 (0.591–1.808)  
BED (10) IC (Gy) ≥ 90 267 84 78 0.0001 - 0.0017
< 90 19 49 42   3.465 (1.655–6.706)  
Margins from GTV to PTV (mm) ≥ 10 158 81 71 0.8043 - 0.8723
< 10 124 80 78   1.047 (0.589–1.833)  
  1. BED biologically effective dose, CI confidence interval, GTV gross tumor volume, HR hazard ratio, IC isocenter, LC local control, PTV planning target volume, SCC squamous cell carcinoma