We used an in-house panel based on hybrid capture for sequence enrichment including the 34 genes frequently mutated in breast cancer (AKT1, ARID1A, ARID1B, BRCA1, BRCA2, CASP8, CCND1, CDH1, ERBB2, ESR1, FGFR1, GATA3, GRB7, GSDMB, MAP2K4, KRAS, MAP3K1, MLL3, MYC, NCOR1, NF1, PGAP, PIK3CA3, PNMT, PTEN, RB1, SF3B1, STARD3, TBX3, TCAP, TP53, VGLL1, ZNF217, ZNF703) and regions in chromosome 8 (targeting amplification of FGFR1 and MYC), chromosome 11 (targeting amplification of CCND1), chromosome 17 (targeting amplification of ERBB2) and chromosome 20 (targeting amplification of ZNF217). The gene discussed is ERBB2; the disease is breast cancer.