Reference 26 to “Kaifi, J.T.; Yekebas, E.F.; Schurr, P.; Obonyo, D.; Wachowiak, R.; Busch, P.; Heinecke, A.; Pantel, K.; Izbicki, J.R., Tumor-cell homing to lymph nodes and bone marrow and CXCR4 expression in esophageal cancer. The gene discussed is CXCR4; the disease is esophageal cancer.