Table 6.

Treatment recommendations by risk level

Risk factor score summation	Crude DBF rate	Treatment recommendations
0~1	14.8%,	SRT as initial treatment and WBRT ± SRT as salvage treatment for DBF
2~3	50.0%,	SRT + close clinical monitoring as initial treatment; if close clinical monitoring is impossible, then WBRT+SRT as initial treatment
4	76.9%	WBRT+SRT as initial treatmentt

Risk factors include number of BMs > 1, total target volume > 6 cc, uncontrolled extracranial disease and interval time between the diagnosis of the primary tumor and BM < 60 months, and each risk factor was assigned a score of 1