Table 6 Cox regression analysis for overall survival

PET-CT Planning

0.640

1.1 (0.72, 1.71)

0.708

Not entered

0.657

0.91 (0.58, 1.41)

0.960

Not entered

Tumor volume (5 cc increase)

0.036

1.03 (1.001, 1.06)

0.030

1.04 (1.006, 1.07)

0.025

1.03 (1.001, 1.06)

0.024

1.04 (1.006, 1.07)

Cetuximab with SBRT

0.192

1.36 (0.86, 2.14)

0.431

Not entered

0.700

1.10 (0.69, 1.74)

0.827

Not entered

Interval from previous radiation to recurrence (3 month increase)

0.731

0.997 (0.97, 1.02)

0.475

Not entered

0.845

0.997 (0.98, 1.01)

0.433

Not entered

Any In-field/Overlap/Marginal failure

0.141

1.39 (0.90, 2.15)

0.025

1.71 (1.07, 2.74)

0.547

1.15 (0.74, 1.78)

0.095

1.50 (0.93, 2.43)

Age (10 year increase)

0.273

1.11 (0.93, 1.32)

0.021

1.25 (1.04, 1.49)

0.128

1.15 (0.96, 1.37)

0.012

1.27 (1.05, 1.54)

Any Prior Surgery

0.007

0.50 (0.30, 0.83)

0.004

0.46 (0.27, 0.78)

0.023

0.55 (0.33, 0.92)

0.010

0.49 (0.29, 0.85)

KPS (10 KPS increase)

0.010

0.80 (0.69, 0.94)

0.007

0.79 (0.66, 0.94)

0.041

0.84 (0.71, 0.99)

0.028

0.82 (0.69, 0.98)

Any distant metastases or untreated locoregional disease

0.004

1.95 (1.24, 3.07)

0.016

1.80 (1.12, 2.90)

0.024

1.69 (1.07, 2.67)

0.037

1.66 (1.03, 2.69)