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Table 3 Univariate and multivariate analysis for local control and overall survival according to patient and tumor characteristics

From: The SBRT database initiative of the German Society for Radiation Oncology (DEGRO): patterns of care and outcome analysis of stereotactic body radiotherapy (SBRT) for liver oligometastases in 474 patients with 623 metastases

 

Univariate

 

Multivariate

 
 

HR (CI)

p-value

HR (CI)

p-value

Local control

Prior CTxa

2.19 (1.23–3.91)

0.008

2.19 (1.18–4.06)

0.13

Histology (CRC)

1.99 (1.31–3.04)

0.001

1.71 (1.04–2.80)

0.03

Histology (BCa)

0.53 (0.25–1.13)

0.10

0.45 (0.19–1.02)

0.06

Histology (NSCLC)

0.86 (0.26–2.85)

0.81

0.67 (0.19–2.35)

0.54

GTV Volumec

1.004 (1.002–1.005)

< 0.001

–

 

PTV Volumec

1.002 (1.001–1.003)

< 0.001

1.001 (1.00–1.002)

0.003

BED Isocenterc

0.993 (0.989–0.997)

< 0.001

0.99 (0.98–1.00)

0.002

BED prescriptionc

0.72 (0.51–1.01)

0.003

1.00 (0.99–1.01)

0.970

Advanced Motion managementa

0.46 (0.29–0.72)

< 0.001

0.57 (0.33–0.96)

0.04

Before 2003a

1.50 (1.04–2.16)

0.031

1.02 (0.61–1.70)

0.932

Overall survival

KIc

0.69 (0.51–0.94)

0.02

0.74 (0.53–0.98)

0.06

Gender

0.80 (0.63–1.01)

0.06

0.76 (0.54–1.06)

0.10

Histology (CRC)

0.61 (0.46–0.79)

< 0.001

0.64 (0.45–0.92)

0.01

Histology (BCa)

0.52 (0.36–0.76)

< 0.001

0.60 (0.36–0.99)

0.05

Histology (NSCLC)

1.42 (0.87–2.33)

0.16

1.14 (0.64–2.07)

0.65

Prior CTxa

0.91 (0.65–1.27)

0.58

1.17 (0.76–1.80)

0.47

Extrahepatic statusb

0.81 (0.60–1.1)

0.18

0.83 (0.49–1.43)

0.52

Solitarya

0.73 (0.57–0.92)

0.007

1.12 (0.61–2.03)

0.72

# of liver metastases (1 vs. 2–4)

0.94 (0.72–1.23)

0.65

0.80 (0.52–1.23)

0.32

GTV Volumec

1.003 (1.002–1.004)

< 0.001

–

 

PTV Volumec

1.002 (1.001–1.002)

< 0.001

1.002 (1.001–1.003)

< 0.001

Local recurrence after SBRTa

0.88 (0.68–1.51)

0.36

0.82 (0.56–1.19)

0.29

BED isocenterc

0.997 (0.994–1.00)

0.06

1.00 (0.99–1.004)

0.97

  1. CTx chemotherapy, BCa breast cancer, BED biologically effective dose, GTV gross tumor volume, PTV planning target volume, PS performance status, HR hazard ratio, CI 95% confidence interval), CRC corolrectal caner, NSCLC non-small cell lung cancer
  2. abinary coded variables with yes vs. no; bcomplete remission/stable disease vs progressive disease; cvolume and minimum biologically effective dose as continuous variables