Table 5.

Survival-related factors on intracranial PFS in multivariate analysis.

Variable	HR (95% CI)	P value
WBRT + SIB	2.31(1.34–3.98)	0.003*
Female	0.56(0.33–0.95)	0.031*
Histological status		0.442
Adenocarcinoma	1.68(0.69–4.09)
Squamous cell carcinoma	1.11(0.48–2.53)
Target therapy after RT	2.89(1.45–5.75)	0.003*

WBRT, whole brain radiation therapy; SIB, simultaneous integrated boost; RT, radiotherapy.

*p < 0.05 was considered significant.