Figure 2.

Overall survival (OS) based on EGFR-amplification in the REAL3 trial. EGFR CN was determined using ddPCR on pretreatment cfDNA. Kaplan-Meier curves show the OS of patients based on the presence/absence of EGFR CN. cfDNA=cell free DNA; CN, copy number; ddPCR, digital-droplet PCR; EGFR, epidermal growth factor receptor;