Fig. 2From: Application of CRISPR/Cas9-based mutant enrichment technique to improve the clinical sensitivity of plasma EGFR testing in patients with non-small cell lung cancerT790M-positive copy number differences between CRISPR-CPPC assay and ddPCR in all 60 samples: CRISPR-CPPC increased the T790M-positive copy numbers, except in sample number 47 (Additional file 1: Table S2). Seven samples with a copy difference of < 1 were not expressed on the log10-scaled y-axisBack to article page