CXCR4 and non-Hodgkin lymphoma: The chemokine for CXCR4, stromal cell derived factor 1 (SDF1), has also been associated with HIV associated Non-Hodgkin's lymphoma (NHL) when individuals have a polymorphism in the SDF1 gene from G to A transition at position 801 (SDF1-3'A) that increased with homozygosity [14].