EGFR and neoplasm: After 14 days of tumor establishment, 89Zr-EGFR-CXCR5-CAR-T cells, 89Zr-EGFR-CAR-T cells, and 89Zr-mock control T cells (n = 3 per group) were injected, respectively, via tail vein, and T cell distribution was monitored at 2, 24, 72, and 168 h post-injection.