Phage clones obtained by screening of the CX7C phage library against MCF-7/TGFβ cancer cells were tested for their selective binding toward the target MCF-7/TGFβ, MDA-MB-231, T47D-shNMI cells and not to breast fibroblasts or epithelial subtype breast cancer cells MCF-7 and T47D in phage capture assay (Figures 3A,B) and phage based ELISA (Figure 3C). Here, TGFB1 is linked to breast cancer.