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EGFR Copy number variation (CNV) values for clinical samples and one normal genomic DNA sample. Genomic DNA copy number alterations were assessed via ddPCR. The CNV is shown as the number of copies and the Poisson distribution at 95 % confidence interval. The copy number value of normal diploid sequence has a score of two. Copy number above two means amplification in that region and copy number below two means deletion in that region
