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Sensitivity of the ddPCR for EGFR T790M and C797S mutations. Up to 0.04% dilution of mutation-type to wild-type of EGFR, at least two positive droplets were stably detected by ddPCR assays. The numbers presented in the positive area were the amounts of EGFR mutation positive droplets by detection. ddPCR, droplet digital polymerase chain reaction; EGFR, epidermal growth factor receptor.
