Recently, the synthesis and in vitro and in vivo characterization of new 99mTc-labeled-MUC1-derived peptide was reported suggesting the potential of this radiotracer for the targeted imaging of MUC1-positive breast cancer (Okarvi & Jammaz, 2009; Okarvi & Jammaz, 2016; Okarvi & Jammaz, 2019). The gene discussed is MUC1; the disease is breast cancer.