Although up to now only a few targeted proteins have been available, affibody conjugates with fluorescent dye are used for experimental imaging of glioma [26], HER-2 expressing tumors [34], EGFR-positive thyroid cancer [35], Epidermoid carcinoma [36], etc. Reports of preclinical radionuclide imaging (PET, SPECT) using affibody are well summarized by Krasniqi et al. [27]. The gene discussed is EGFR; the disease is thyroid cancer.