After selecting the most stable of these three compounds, i.e., compound [11C]3 (Fig. 3), autoradiography experiments on MDA-MB-231 tumour sections, known for its high expression of TG2 (Mehta et al. 2004), demonstrated selective and specific binding to TG2 (Van der Wildt et al. 2016). This evidence concerns the gene TGM2 and neoplasm.