Both AITL and PTCL-NOS harboring the CXCL12 rs2839695 A/A genotype (PTCL-CXCL12+) express high levels of CXCL12, a chemokine essential for T-cell chemotaxis to lymphoid organs [150]. The gene discussed is CXCL12; the disease is mature T-cell and NK-cell non-Hodgkin lymphoma.