Retroperitoneal liposarcomas: the experience of a tertiary Asian center

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

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%

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.

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