showed a trendp = 0.0640
In the model 2 of multivariable analysis, considering the detailed metastatic sites instead of number of metastatic sites, we found exon 21 (HR [95% CI]: 1.56 [1.04–2.36], p = 0.0336), pleural metastasis/effusion (HR [95% CI]: 1.77 [1.17–2.69], p = 0.0075), and bone metastasis (HR [95% CI]: 1.69 [1.13–2.55], p = 0.0116) were independent risk factors for poorer PFS, while dose reduction showed a trend toward better PFS (HR [95% CI]: 0.59 [0.34–1.03], p = 0.0640).