Fig. 3

a Overall survival (OS) of patients according to different brain radiotherapy strategies. b Comparison of OS between the whole brain radiotherapy (WBRT) and local radiotherapy groups. c Comparison of OS between the WBRT and WBRT + Boost groups. d Comparison of OS between the local radiotherapy and WBRT + Boost groups. e OS of patients in group A stratified according to different brain radiotherapy strategies and f–h the differences between them. i OS 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, there was no significant difference among the three radiotherapy methods, while in the high Lung-molGPA groups, the difference between WBRT group and the other two groups was also statistically significant