title: Pleural effusion of a second neoplasm in a patient with B-CLL: two immunological compartments.
abstract: We report the case of a patient with a chronic lymphocytic leukemia (CLL) who later developed a metastasized large-cell neuroendocrine carcinoma of the lung that was complicated by a malignant pleural effusion. In contrast to the peripheral blood where the malignant B-CLL cells represented >99% of all lymphocytes, lymphocytes infiltrating the malignant effusion were mainly T cells. Nearly all of these T cells were CD4(+). This stood in sharp contrast to the peripheral blood where the CD4(+)/CD8(+) ratio remained balanced. A detailed analysis of the CD4(+) T cells within the malignant effusion revealed that these cells uniformly expressed a CCR7(+) CD62L(+) "non-effector" phenotype. When the monoclonal B cells within the malignant effusion were analyzed, we found that these cells, in contrast to the B-CLL cells in the peripheral blood, were negative for CD23 and expressed much higher levels of the adhesion molecules L-selectin (CD62L) and CD11a. A deficient expression of these adhesion molecules might have led to a "trapping" of the majority of B-CLL cells in the peripheral blood. This phenomenon might have contributed to the development of two highly different immunological compartments in this patient with CLL and pleural effusion of a solid tumor.
authors.affiliation: Department of Oncology and Hematology, University Clinic Eppendorf, Hamburg, Germany. atanackd@mskcc.org
authors.forename: D
authors.initials: D
authors.lastname: Atanackovic
authors.forename: S
authors.initials: S
authors.lastname: Brettner
authors.forename: S
authors.initials: S
authors.lastname: Hegewisch-Becker
mesh_terms: D015703:Antigens, CD; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000473:pathology*; D008175:Lung Neoplasms / Q000276:immunology / Q000473:pathology / Q000556:secondary*; D008198:Lymph Nodes / Q000276:immunology / Q000473:pathology; D008214:Lymphocytes / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016609:Neoplasms, Second Primary / Q000276:immunology* / Q000473:pathology; D010996:Pleural Effusion / Q000209:etiology*
chemical_list: D015703:Antigens, CD