Table 3 Univariate and multivariate analysis of risk factors for disease recurrence (Cox regression analysis)

Age (> 60 years)

1.84

1.04–3.25

0.035

1.37

0.77–2.45

0.283

Sex (Male vs. Female)

1.93

0.97–3.83

0.061

1.32

0.66–2.66

0.437

Histology (clear cell vs non-clear cell)

1.54

0.66–3.62

0.318

SSIGN score

  0–4

Reference

Reference

  5–7

14.0

7.36–26.5

 < 0.001

10.59

5.29–21.2

 < 0.001

  8–13

77.9

38.2–159

 < 0.001

59.2

27.8–126

 < 0.001

  DTPA SRF of affected kidney (< 45%)

3.94

2.29–6.77

 < 0.001

1.75

0.97–3.18

0.065