Fig. 2

a Intracranial progression-free survival (iPFS) of patients according to different the brain radiotherapy strategies. b Comparison of iPFS between the whole brain radiotherapy (WBRT) and local radiotherapy groups. c Comparison of iPFS between the WBRT and WBRT + Boost groups. d Comparison of iPFS between the local radiotherapy and WBRT + Boost groups. e iPFS of patients in group A stratified according to different brain radiotherapy strategies and f–h the differences between them. i iPFS of patients in group B stratified according to different brain radiotherapy strategies and j–l the differences between them. The results showed that in the low Lung-molGPA groups, only WBRT group and WBRT + Boost group trended towards statistically significant, while in the high Lung-molGPA groups, the difference between WBRT group and the other two groups was statistically significant