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EGFR mutation status of patient No.17 using different sample types. (A) Wild type in cell blocks. (B) Exon 19 Del in exosomes. ΔCt was defined as the difference between the Ct value of specific mutation type and QC. And it was considered positive for exon 19 Del when ΔCt was <7. QC, quality control (a house-keeping gene).
