Panel-based next generation sequencing was conducted in cases with DNA that passed quality controls. Tumor DNA was sequenced using a home-made panel of genes as previously described [23 (link)]. For each tumor sample, a library of all coding exons and intron–exon boundaries of a panel of 794 target genes (Additional file 1: Table S1) was constructed using the SureSelect enrichment system (Agilent Technologies, Santa Clara, CA, USA). Sequencing was carried out using the Illumina NextSeq500 device (San Diego, CA, USA), according to the manufacturer’s instruction at a median depth of 162×.
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