64Cu PET/CT has been used in the context of cancer detection and characterization (Capasso et al. 2015; Piccardo et al. 2018; Panichelli et al. 2016; Wachsmann and Peng 2016), utilizing the overexpression of the human copper transporter 1 (CTR1) in malignant cells (Peng et al. 2006). Here, SLC31A1 is linked to cancer.