Table 1. Patients' characteristics (n = 64).

ECOG, Eastern Cooperative Oncology Group; RPA, recursive partitioning analysis; WBRT, whole brain radiation therapy; SRS, stereotactic radiosurgery.

^a)Patients with ECOG status 3 and 4 and RPA class 3 were excluded in treatment. ^b)Disease control status of primary lung lesion.