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Table 2 Risk factors for overall survival and disease free survival after operation (p-values of the Tarone-ware test are presented)

From: Retroperitoneal liposarcomas: the experience of a tertiary Asian center

Risk factors 3-year survival rate 5-year survival rate p-value
Gender    0.544
   Male 90% 67.5%  
   Female 83.3% 27.8%  
Age (>50 years)    0.843
   < = 50 83.3% 55.6%  
   >50 90% 45%  
Tumor size (> 20 cm)    0.379
   < = 20 100% 66.7%  
   > 20 80.8% 40.4%  
Margins    0.757
   Negative 87.5% 58.3%  
   Positive 88.9% 44.4%  
Degree of Differentiation    0.997
   Well differentiated 90.9% 83.3%  
   Not well differentiated 54.5% 41.7%  
Grade    0.718
   1 88.9% 44.4%  
   2 & 3 85.7% 57.1%  
Organ resection    0.248
   Yes 100% 40%  
   No 60% 60%  
  1. Tarone-ware test (which can be applied in case of non proportional hazard) was used to compare the overall survival rates for each covariates of interest. Although 3-year and 5-year survival rates were both higher for male patients, patients with tumor size >20 cm and well differentiated, no significant difference could be detected using Tarone-ware test, this might be due to the small sample size.