Differential expression of CBP and GCN5 proteins in normal and malignant BC cells was investigated in an in-vitro model using a panel of nine BC cell lines with different ERα, PR and HER2 receptor status and two types of normal breast epithelial cells (Fig. 1a, b, Additional file 1: Fig. S1, Additional file 1: Table S1). This evidence concerns the gene KAT2A and breast cancer.