SLC7A5 and neoplasm: 18F-Phe-BF3 (an exotic replacement of the carboxylate with -BF3) is a new class of AA mimetics-boramino acid tracer for PET imaging of transporter LAT1 in tumor, with specific accumulation in U87MG xenografts and low uptake in normal brain and an inflammatory region (Liu et al., 2015).