Figure 2.

Progression‐free survival (PFS). (A): Kaplan‐Meier curves of PFS related to epidermal growth factor receptor tyrosine kinase inhibitor of patients in the SRS group (black solid line), WBRT group (black dashed line), DRT group (red solid line), and the NRT group (red dashed line). (B): Time to intracranial progression of patients who received immediate cranial irradiation (SRS group and WBRT group, black dashed line) and patients who did not (DRT and NRT group, black solid line). Vertical lines indicate censored data.

Abbreviations: DRT, delayed radiation upon progression of cranial lesions; NRT, never cranial irradiation; SRS, immediate cranial stereotactic radiosurgery; WBRT, immediate whole brain radiation.