ERBB2 and breast cancer: Consistently, analysis of the Broad-Novartis Cancer Cell Line Encyclopedia expression data of breast cancer cell lines showed expression of MFGE8 above the confidence level (Log2 Affymetrix U133plus2.0 signal of MAS5 “absence” flag = 6,1 for MFGE8) in the majority of triple-negative breast cells (24/29 = 82%), whereas only 2/23 = 9% of the HR and/or HER2+ cells expressed the gene (Figure 6c).