title: Letter to the editor regarding 'Seol H, Lee HJ, Choi Y, et al. Intratumoural heterogeneity of HER2 gene amplification in breast cancer: its clinicopathological significance'.
authors.forename: Martin C
authors.initials: MC
authors.lastname: Chang
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics* / Q000401:mortality* / Q000473:pathology*; D005260:Female; D005784:Gene Amplification; D018734:Genes, erbB-2 / Q000235:genetics*; D006801:Humans