Electric field–induced release and measurement liquid biopsy assay results of serially diluted genomic DNA (gDNA) for the top four EGFR exon 19 variants. A–D: Plot of measurement results for variants c.2235_2249 del18, c2236_2250 del18, c2240_2257 del18, and c.2239_2248 del 11, respectively. E–H: Linear range of c.2235_2249 del18, c2236_2250 del18, c2240_2257 del18, and c.2239_2248 del 11, respectively. The blue dashed lines represent the best linear least squares fit for the data. NTC, no template control; RKO, reference cell line genomic DNA.