The 89Zr-EGFR-CXCR5-CAR-T cells showed trafficking to the A549-CXCL13 tumor 72 h post-infusion, whereas the 89Zr-EGFR-CAR-T cells and 89Zr-mock control T cells were barely detectable (Figure 4D). This evidence concerns the gene CXCL13 and neoplasm.