EGFR and non-small cell lung carcinoma: Here, we report a ddPCR-based ultrasensitive multiplex assay for the 3 common mutations of EGFR (L858R, exon 19 deletion, and T790M) in FFPE samples from NSCLC patients; this assay allows the detection of mutations in different exons with multiple primer sets via digital PCR on genomic DNA samples from tumor tissues.