CXCR4 is a G protein-coupled chemokine receptor that functions as a critical mediator of cell migration, hematopoiesis, and tissue homeostasis through binding its primary ligand CXCL12 1. The receptor orchestrates multiple signaling pathways controlling cell migration, homing to the bone marrow, and cell proliferation of both hematopoietic and non-hematopoietic cells 1. CXCR4 plays significant roles in tissue regeneration and stem cell activation, though these regenerative mechanisms overlap with pathways exploited in cancer development 1. In pathological contexts, CXCR4 is implicated in fibrosis across multiple organs (heart, liver, lung, kidney) through mechanisms involving inflammation, epithelial-mesenchymal transition, and angiogenesis 2. CXCR4 serves as an HIV-1 coreceptor alongside CD4, enabling viral entry and infection 3. Clinically, CXCR4 mutations are associated with Waldenström macroglobulinemia and glioblastoma, where CXCR4 maintains cancer stem cell phenotypes and promotes therapeutic resistance 4, 5. CXCR4 antagonists represent emerging therapeutic strategies: mavorixafor was approved in 2024 for WHIM syndrome to increase circulating neutrophils and lymphocytes 6, while [68Ga]Ga-PentixaFor shows promise as a diagnostic PET imaging agent for hematologic malignancies and inflammatory diseases 7.