ERBB2 and cancer: Eight studies performed sequencing through different cancer‐related gene panels, and nine studies sequenced only predesignated genes including EGFR, KRAS proto‐oncogene (KRAS), B‐Raf proto‐oncogene (BRAF), erb‐b2 receptor tyrosine kinase 2 (ERBB2), and MET proto‐oncogene (MET).