Table 4 Survival (univariate analysis)

Treatment regimen

  Radiosurgery alone (n = 30)

80

63

  Radiosurgery + WBI (n = 28)

93

71

0.48

Radiosurgery dose

  <20 Gy (n = 23)

83

65

  ≥20 Gy (n = 35)

89

69

0.56

Age

  ≤59 years (n = 34)

91

76

  ≥60 years (n = 24)

79

54

0.054

ECOG performance score

  0-1 (n = 40)

98

85

  2 (n = 18)

61

28

<0.001

Number of cerebral metastases

  1 (n = 46)

83

63

  2-3 (n = 12)

100

83

0.67

Maximum diameter of all brain metastases

  ≤10 mm (n = 28)

89

79

  ≥11 mm (n = 30)

83

57

0.16

Site of brain metastases

  Supratentorial (n = 39)

85

64

  Infratentorial ± supratentorial (n = 19)

89

74

0.22

Extra-cranial metastases

  No (n = 24)

88

75

  Yes (n = 34)

85

62

0.38