BL1 and BL2 of Lehmann classification belong to Basal A of Neve classification, whereas M and MSL belong to Basal B. In line with our data, results from a whole-genome small hairpin RNA screen demonstrated that TCOF1 is a preferentially essential gene in Basal A but not other subtypes of breast cancer in the Neve classification [59]. Here, TCOF1 is linked to breast carcinoma.