Table 2 Univariate and multivariate analysis for local failure

  Location of metastasis

1.07 (0.46, 2.50)

0.88

1.01 (0.47, 2.19)

0.98

  Tumor size ≤2 cm

0.40 (0.19, 0.88)

0.02

0.44 (0.22, 0.88)

0.02

  Histology^a

1.26 (0.30, 5.30)

0.75

1.21 (0.31, 4.76)

0.78

  Surgical resection

1.44 (0.44, 4.75)

0.54

1.42 (0.49, 4.12)

0.52

  SF vs HF-SRS

2.10 (1.03, 4.33)

0.04

1.73 (0.90, 3.33)

0.10

  Concurrent systemic therapy

0.79 (0.35, 1.78)

0.57

0.67 (0.31, 1.44)

0.30

  Prior WBRT

1.97 (0.96, 4.04)

0.07

1.58 (0.82, 3.03)

0.17

  SF- vs HF-SRS

1.99 (0.84, 4.76)

0.12

1.65 (0.70, 3.87)

0.25

  Tumor size ≤2 cm

0.49 (0.20, 1.17)

0.11

0.53 (0.23, 1.24)

0.14

  Prior WBRT

2.10 (0.92, 4.81)

0.08

1.83 (0.77, 4.38)

0.17