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Complex analysis of cyclin D1 expression in mantle cell lymphoma: two cyclin D1-negative cases detected. 2009

L Stefancikova, and M Moulis, and P Fabian, and I Falkova, and I Vasova, and L Kren, and J Macak, and J Smardova
Department of Pathology, University Hospital Brno Jihlavska 20, 625 00 Brno, Czech Republic.

OBJECTIVE The cytogenetic and diagnostic hallmark of mantle cell lymphoma (MCL) is translocation t(11;14)(q13;q32), resulting in overexpression of cyclin D1. Cyclin D1 expression was analysed in 32 cases of MCL. METHODS The t(11;14) translocation was detected by fluorescence in situ hybridisation, level of cyclin D1 mRNA by competitive RT-PCR, and level of cyclin D1 and D2 proteins by immunohistochemistry and/or immunoblotting. RESULTS In 30 cases, the presence of translocation t(11;14), a high level of cyclin D1 mRNA, and a high level of the cyclin D1 protein were confirmed. Two cyclin D1-negative cases overexpressing cyclin D2 were detected by immunoblotting. CONCLUSIONS There are rare cyclin D1-negative cases of MCL overexpressing cyclin D2. Anti-cyclin D1 antibodies with low specificity can bind both cyclin D1 and cyclin D2, thus providing false cyclin D1-positive signals in immunohistochemical analysis.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009363 Neoplasm Proteins Proteins whose abnormal expression (gain or loss) are associated with the development, growth, or progression of NEOPLASMS. Some neoplasm proteins are tumor antigens (ANTIGENS, NEOPLASM), i.e. they induce an immune reaction to their tumor. Many neoplasm proteins have been characterized and are used as tumor markers (BIOMARKERS, TUMOR) when they are detectable in cells and body fluids as monitors for the presence or growth of tumors. Abnormal expression of ONCOGENE PROTEINS is involved in neoplastic transformation, whereas the loss of expression of TUMOR SUPPRESSOR PROTEINS is involved with the loss of growth control and progression of the neoplasm. Proteins, Neoplasm
D002880 Chromosomes, Human, Pair 11 A specific pair of GROUP C CHROMOSOMES of the human chromosome classification. Chromosome 11
D002883 Chromosomes, Human, Pair 14 A specific pair of GROUP D CHROMOSOMES of the human chromosome classification. Chromosome 14
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly
D014178 Translocation, Genetic A type of chromosome aberration characterized by CHROMOSOME BREAKAGE and transfer of the broken-off portion to another location, often to a different chromosome. Chromosomal Translocation,Translocation, Chromosomal,Chromosomal Translocations,Genetic Translocation,Genetic Translocations,Translocations, Chromosomal,Translocations, Genetic

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