Immunohistochemical Analysis of IL-6, IL-8/CXCR2 Axis,  Tyrp-STAT-3, and SOCS-3 in Lymph Nodes from Patients with Chronic Lymphocytic Leukemia: Correlation between Microvascular Characteristics and Prognostic Significance. This evidence concerns the gene STAT3 and B-cell chronic lymphocytic leukemia.