This data set includes a median MYF6 expression level of 3.75 for 16 patients with HCL, compared to -0.6 to -1.9 for Burkitt’s Lymphoma (n = 127), centroblastic lymphoma (n = 28], CLL (n = 34], diffuse large B-cell lymphoma (n = 41], follicular lymphoma (n = 6), Hodgkin’s lymphoma (n = 4), MCL (n = 8), plasma cell leukemia (n = 3) and primary effusion lymphoma (n = 9). This evidence concerns the gene MYF6 and hairy cell leukemia.