CXCR4 and marginal zone lymphoma: In our second study on the chemokine receptor in MALT lymphomas, the CXCR4 expression was missing in gastric MALT lymphomas or gastric extranodal DLBCL compared to nodal lymphomas, nodal MZL, and nodal DLBCL, which exhibited a strong expression [112] indicating that CXCR4 expression is associated with nodal manifestation.