B-lymphocyte malignancy.
D001402:B-Lymphocytes / Q000032:analysis / Q000276:immunology*; D002999:Clone Cells; D006801:Humans; D007075:Immunoglobulin M / Q000032:analysis; D007945:Leukemia, Lymphoid / Q000276:immunology; D009369:Neoplasms / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
D007075:Immunoglobulin M