Reasonable Timing of Radiotherapy for Stage IV Non-Small-Cell Lung Cancer During Targeted Therapy Based on Tumour Volume Change.

The GTV of all patients had different degrees of change from C 0 to the last SCTS and showed a trend of gradual shrinkage, in which the largest volume shrinkage rate was 78.1% (gefitinib, thick red solid line) and the smallest was 18.8% (icotinib, thick black solid line) ( Figure 1 ).

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