label: B-Cell Prolymphocytic Leukemia
label_lc: b-cell prolymphocytic leukemia
description: A malignant B-cell lymphoproliferative process affecting the blood, bone marrow, and spleen.  The B-prolymphocytes are medium-sized, round lymphoid cells with prominent nucleoli.  The B-prolymphocytes must exceed 55% of lymphoid cells in the blood.  Cases of transformed chronic lymphocytic leukemia (CLL) and CLL with increased prolymphocytes are excluded.  The prognosis is poor.  (WHO, 2001)