Recently, Nozaki et al. (2019) designed and synthetized a phenylalanine based tracer, [18F]-FIMP (Fig. 5E), which demonstrated greater tumor targeted delivery in the subcutaneous LAT1-positive human glioblastoma xenograft model as compared to [18F]-FET, [11C]-MET and [18F]-FDG (111). The gene discussed is SLC7A5; the disease is glioblastoma.