title: Cyclin D1 expression in peripheral T-cell lymphomas.
abstract: Cyclin D1 is an important regulator of the cell cycle and overexpression of this protein by immunohistochemistry is characteristically seen in mantle cell lymphoma and other B-cell neoplasms. However, little is known about the expression of this protein in T-cell lymphomas. Cyclin-dependent kinase pathway inhibitors are in development, therefore identifying cyclin D1-positive T-cell lymphomas may provide a therapeutic target in a disease where novel treatments are urgently needed. We collected 200 peripheral T-cell lymphomas from three institutions including the following types of cases: 34 anaplastic large cell lymphoma, ALK+, 44 anaplastic large cell lymphoma, ALK negative, 68 peripheral T-cell lymphomas, not otherwise specified, 24 angioimmunoblastic T-cell lymphomas, 7 extranodal NK/T-cell lymphomas, 4 enteropathy associated T-cell lymphomas, 3 hepatosplenic T-cell lymphomas, 12 cutaneous T-cell lymphomas, and 4 large granular lymphocytic leukemias. Immunohistochemical stains for cyclin D1 protein (SP4 clone) were performed on paraffin-embedded tissue. In a subset of cases, IGH/CCND1 fluorescence in situ hybridization analysis was also performed. Cyclin D1 staining was predominantly seen in anaplastic large cell lymphoma, including 8 of 34 cases with ALK+ anaplastic large cell lymphoma (24%), and 3 of 44 cases of ALK-negative (7%) anaplastic large cell lymphoma. Three cases of peripheral T-cell lymphoma, not otherwise specified, were also positive (3/68, 4%). All other T-cell lymphomas were negative for cyclin D1. In four of the cyclin D1-positive T-cell lymphomas by immunohistochemistry, fluorescence in situ hybridization analysis was negative for IGH/CCND1 translocation or extra copies of the CCND1 gene. Cyclin D1 overexpression by immunohistochemistry is not limited to B-cell lymphomas and is also observed in some peripheral T-cell lymphomas, particularly in anaplastic large cell lymphoma, ALK+. Cyclin D1 expression was not associated with extra copies or translocation of the CCND1 gene. Cyclin D1 overexpression may be the result of a post-translational phenomenon and may represent a potential therapeutic target using agents that target the cyclin-dependent kinase pathway.
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Joo Y
authors.identifier: 0000-0003-3497-2513
authors.initials: JY
authors.lastname: Song
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Liping
authors.initials: L
authors.lastname: Song
authors.affiliation: Department of Hematology and Hematopoietic Cell Transplantation, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Alex F
authors.initials: AF
authors.lastname: Herrera
authors.affiliation: Department of Pathology, University of Chicago, Chicago, IL, USA.
authors.forename: Girish
authors.initials: G
authors.lastname: Venkataraman
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Joyce L
authors.initials: JL
authors.lastname: Murata-Collins
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Victoria H
authors.initials: VH
authors.lastname: Bedell
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Yuan Yuan
authors.initials: YY
authors.lastname: Chen
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Young S
authors.initials: YS
authors.lastname: Kim
authors.affiliation: Department of Pathology, Chino Valley Medical Center, Chino, CA, USA.
authors.forename: Reda
authors.initials: R
authors.lastname: Tadros
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Bharat N
authors.initials: BN
authors.lastname: Nathwani
authors.affiliation: Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
authors.forename: Dennis D
authors.initials: DD
authors.lastname: Weisenburger
authors.affiliation: Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA.
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Feldman
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis*; D019938:Cyclin D1 / Q000032:analysis / Q000096:biosynthesis*; D006801:Humans; D016411:Lymphoma, T-Cell, Peripheral / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; C530104:CCND1 protein, human; D019938:Cyclin D1