Many studies have been devoted to the role of miRNA in various diseases, including triple-negative BC (Bar et al., 2017; Buschmann et al., 2018; Yao et al., 2018), luminal A and B subtypes of BC (Aure et al., 2017; Hannafon et al., 2016; Wang & Luo, 2015) and the HER2 subtype of BC (Halvorsen et al., 2017; Patel et al., 2016; Wang & Lin, 2013). Here, ERBB2 is linked to breast cancer.