Table 2.

Results of univariate analysis of risk factors associated with local control

Characteristic		Univariate P value
Age	≥70	0.001
Sex	male	0.030
Performance status	≥2	0.102
Brinkman index	≥1000	0.003
Histology	AC	0.053
Tumor volume	≥18 cm3	0.020
Prescription dose (BED10)	≤60 Gy	0.023
Fractionation	SRT	0.596
Prior WBRT	Yes	0.015
Controlled primary disease	No	0.252

AC = adenocarcinoma, BED₁₀ = biological equivalent dose for α/β = 10, WBRT = whole brain radiotherapy.