A2M and breast cancer: From the 873 statistically evaluated proteins (Additional file 4: Table S4), 14 proteins (Table 4) were classified as differentially abundant; 10 of them (alpha-1B-glycoprotein, ceruloplasmin, alpha-2-macroglobulin, serotransferrin, immunoglobulin heavy constant mu, alpha-1-acid glycoprotein 1, ferritin heavy chain, proteinS100-A8, and serum albumin) were also found as differentially abundant in the total set of breast cancer patients.