title: Cyclin D1 overexpression in malignant lymphomas.
abstract: Cyclin D1, the regulatory subunit of certain protein kinases thought to advance the G1 phase of the cell cycle, is now established as a proto-oncogene, with evidence indicating that its derangement may contribute to the uncontrolled cell growth characteristic of tumors. The chromosomal translocation t(11;14)(q13:q32), involving rearrangement of the BCL-1 locus, is closely associated with human lymphoid neoplasia affecting mantle cell lymphomas (MCL). Recently, the putative BCL-1 proto-oncogene turned out to be none other than the cyclin D1 gene. Although the observed break points in the BCL-1 locus are not tightly clustered, its rearrangement has been documented in 40-70% of cases of mantle cell lymphoma, whereas it only rarely occurs in other B cell lymphomas. Of note, all of the known break points leave the cyclin D1 coding region structurally intact and result in increased protein expression, implying that this may provide a highly sensitive and specific marker for MCL. Recent studies demonstrated that immunohistochemical detection in paraffin-embedded material, using a monoclonal antibody, is very useful for routine diagnosis. Current knowledge of cyclin D1 overexpression in malignant lymphomas, with emphasis on its clinicopathologic significance, is reviewed.
authors.affiliation: Department of Pathology and Clinical Laboratories, Aichi Cancer Center Hospital, Nagoya, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Yatabe
authors.forename: M
authors.initials: M
authors.lastname: Seto
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002880:Chromosomes, Human, Pair 11; D002883:Chromosomes, Human, Pair 14; D019938:Cyclin D1; D016213:Cyclins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D008875:Middle Aged; D015513:Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D000090063:Proto-Oncogene Mas; D015996:Survival Rate; D014178:Translocation, Genetic
chemical_list: D016213:Cyclins; C000715470:MAS1 protein, human; D015513:Oncogene Proteins; D000090063:Proto-Oncogene Mas; D019938:Cyclin D1