CXCR4 and neoplasm: Different imaging labels on the Ac-TZ14011 peptide have been shown to aid the specific visualization of CXCR4 expressing tumor cells with: i) fluorescence IHC (FITC labeled version), ii) flow cytometric analysis (FITC labeled version), iii) SPECT/CT (111In-DTPA labeled version) and iv) in vivo fluorescence imaging (near-infrared labeled version) [18]–[20].