Clinical and immunological findings in large B-cell chronic lymphocytic leukemia

Abstract

In order to define the characteristics of B-CLL cases in which the predominant cell population is composed of large lymphocytes, we studied 97 patients with B-CLL, comparing the cell morphological features with the clinical and biological findings and the immunological phenotype of the proliferating cells. Multivariant analysis showed that there were three significantly different morphological groups: Typical CLL, large lymphocyte CLL (LLL), and CLL with prolymphocytes ( CLL PL ). The LLL group showed a greater incidence of lymphadenopathies ( P < 0.05) and higher percentages of both μ+δ+ cells ( P < 0.01) and Fmc 7+ cells ( P < 0.001) than in typical CLL. The main differences between LLL and CLL PL were the peripheral blood lymphocyte count and the percentage of Fmc 7+ cells ( P < 0.002)—both higher in the CLL PL group—and the percentage of mouse rosette-forming cells ( P < 0.01)—lower in CLL PL . Further studies including functional assays and survival analyses could contribute to elucidating whether these groups are different entities or a single disease with marked heterogeneity.