AMD3100 octahydrochloride is a selective bicyclam derivative which functions as a stem cell mobiliser via blocking the CXCR4 chemokine receptor. Studies suggest that AMD3100 octahydrochloride causes the rapid movement of stem cells out of bone marrow via blocking the CXCR4 receptor. Since the CXCR4 receptor is responsible for regulating metastasis in chemoresistant melanoma cells, blocking this receptor can possibly reduce the metastasis of melanoma cells. In addition, studies indicate that AMD3100 octahydrochloride can inhibit the replication of human immunodeficiency virus in vitro by blocking the entry of the virus into cells. Furthermore, AMD3100 octahydrochloride can also reduce the number of human CD4+ T cells.