CD44 and breast cancer: Several specific antibodies were isolated after panning a scFv phage library against a breast cancer cell line overexpressing cell surface adhesion receptor (CD44) and ephrin type-A receptor 2 (EphA2) antigens for two rounds before panning the retrieved polyclonal phage pool on yeast expressing domain 1 of CD44 and the extracellular domain of EphA2 for another two rounds.