Fig. 1: Frequency of most common genomic alterations by HER2 status.
From: Comprehensive genomic characterization of HER2-low and HER2-0 breast cancer

a The frequency of copy number variations (CNV); b the frequency of gene mutations. Shading represents the percentage of oncogenic events. An annotation of “(A)” beside a gene represents high amplification and “(D)” represents a deep or 2-copy deletion as the oncogenic event. Unshaded bars represent any other copy number event. HER2 human epidermal growth factor receptor 2, ER estrogen receptor.