Luo et al. reported a prostate-specific membrane antigen (PSMA) targeted AuNPs that are selective to PSMA-expressing prostate cancer cells (PC3pip) and using micro-CT found that the accumulation of PSMA-targeted AuNPs in prostate tumors in mice revealed a size-dependent pattern (Figure 2a) [65]. The gene discussed is FOLH1; the disease is prostate cancer.