CXCR4 and marginal zone lymphoma: For instance, in specimen of patients afflicted with marginal zone lymphoma (MZL), more than 90% revealed relevant CXCR4 expression and those ex-vivo findings then laid the proper groundwork for in-vivo imaging using CXCR4-directed [68Ga]Ga-PentixaFor PET/CT [2, 3].