ALB and malignant colon neoplasm: As a promising theranostic system for colon cancer MRI and targeting CT-26 colon cancer cells via folate receptors overexpressed on cancer cells a nanocomposite of GO integrated with polydopamine, bovine serum albumin, diethylenetriaminopentaacetic acid-manganese (II) contrast agent and 5-fluorouracil (5-FU, Figure 4), which was biocompatible and selectively distributed into the CT-26 tumors compared with liver and spleen, was designed by Foroushani et al. [200].