These include GRPR-expressing gastrinoma, breast and prostate carcinoma, or small cell lung cancer patients (Mattei et al. 2014; Morgat et al. 2017; Nock et al. 2005; Reubi et al. 2002a, b, 2004; Reubi 2007). The gene discussed is GRPR; the disease is gastrin-producing neuroendocrine tumor.