Table 4. Univariate and multivariate analyses of progression‐free survival times related to tyrosine kinase inhibitors.
a
Extracranial lesions: number of extracranial organs with cancers on diagnosis of brain metastases.
Abbreviations: CI, confidence interval; DRT, delayed radiation upon progression of cranial lesions; EGFR, epidermal growth factor receptor; HR, hazard ratio; NRT, never cranial irradiation; SRS, immediate cranial stereotactic radiosurgery; WBRT, immediate whole brain radiation.