Multiple cell cycle regulator alterations in Richter's transformation of chronic lymphocytic leukemia

To investigate the role of the cell cycle regulators p21(Waf1), p27(Kip1), retinoblastoma (Rb), and cyclin D1 in Richter's transformation of chronic lymphocytic leukemia (CLL), we analyzed 19 CLL and eight Richter's syndrome (RS) tumors, previously characterized for p53 and ARF/INK4a abnor...

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Veröffentlicht in:Leukemia 2002-06, Vol.16 (6), p.1028-1034
Hauptverfasser: COBO, F, MARTINEZ, A, MONTSERRAT, E, CAMPO, E, PINYOL, M, HERNANDEZ, L, GOMEZ, M, BEA, S, ESTEVE, J, ROZMAN, M, BOSCH, F, LOPEZ-GUILLERMO, A
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container_end_page 1034
container_issue 6
container_start_page 1028
container_title Leukemia
container_volume 16
creator COBO, F
MARTINEZ, A
MONTSERRAT, E
CAMPO, E
PINYOL, M
HERNANDEZ, L
GOMEZ, M
BEA, S
ESTEVE, J
ROZMAN, M
BOSCH, F
LOPEZ-GUILLERMO, A
description To investigate the role of the cell cycle regulators p21(Waf1), p27(Kip1), retinoblastoma (Rb), and cyclin D1 in Richter's transformation of chronic lymphocytic leukemia (CLL), we analyzed 19 CLL and eight Richter's syndrome (RS) tumors, previously characterized for p53 and ARF/INK4a abnormalities. p21(Waf1)immunohistochemical expression was negative in 12 of 15 CLL (80%), whereas it was moderate or strong in three of seven RS (43%). p21(Waf1) gene was in germline configuration in all the tumors analyzed. Four immunohistochemical patterns of p53 and p21(Waf1) expression were observed: (1) p53-/p21- in 10 of 15 CLL (67%), but only in two of six RS (33%); (2) p53+/p21+ in three CLL (20%) and two RS (33%); (3) p53-/p21+ in one RS; and (4) p53++/p21- in two CLL and one RS. Two p53+/p21+ CLL evolved into RS. p53 mutations clustered around the p53++/p21- (two CLL and one RS) and p53-/p21- (one CLL and one RS) tumors. While the majority of CLL displayed strong p27 immunoreactivity, RS tumors were constantly p27-negative. p27(Kip1) gene was in germline configuration in all the tumors analyzed. Most CLL cases were negative for Rb expression. In contrast, all RS exhibited strong Rb expression. Cyclin D1 overexpression was only detected in one CLL evolving into RS and one RS. In conclusion, a p53+/p21- immunohistochemical pattern is shown exclusively by p53-mutated CLL/RS. Additionally, our results suggest a possible implication of moderate/strong p21(Waf1) expression, loss of p27 expression, and cyclin D1 overexpression in the Richter's transformation of CLL.
doi_str_mv 10.1038/sj.leu.2402529
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Four immunohistochemical patterns of p53 and p21(Waf1) expression were observed: (1) p53-/p21- in 10 of 15 CLL (67%), but only in two of six RS (33%); (2) p53+/p21+ in three CLL (20%) and two RS (33%); (3) p53-/p21+ in one RS; and (4) p53++/p21- in two CLL and one RS. Two p53+/p21+ CLL evolved into RS. p53 mutations clustered around the p53++/p21- (two CLL and one RS) and p53-/p21- (one CLL and one RS) tumors. While the majority of CLL displayed strong p27 immunoreactivity, RS tumors were constantly p27-negative. p27(Kip1) gene was in germline configuration in all the tumors analyzed. Most CLL cases were negative for Rb expression. In contrast, all RS exhibited strong Rb expression. Cyclin D1 overexpression was only detected in one CLL evolving into RS and one RS. In conclusion, a p53+/p21- immunohistochemical pattern is shown exclusively by p53-mutated CLL/RS. 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Additionally, our results suggest a possible implication of moderate/strong p21(Waf1) expression, loss of p27 expression, and cyclin D1 overexpression in the Richter's transformation of CLL.</description><subject>Abnormalities</subject><subject>Adult</subject><subject>Aged</subject><subject>Biological and medical sciences</subject><subject>Cancer</subject><subject>Cell Cycle</subject><subject>Cell Cycle Proteins - metabolism</subject><subject>Chronic lymphocytic leukemia</subject><subject>Configurations</subject><subject>Cyclin D1</subject><subject>Cyclin D1 - metabolism</subject><subject>Cyclin-Dependent Kinase Inhibitor p21</subject><subject>Cyclin-Dependent Kinase Inhibitor p27</subject><subject>Cyclins - metabolism</subject><subject>Female</subject><subject>Genes, p53</subject><subject>Genetic aspects</subject><subject>Genetic transformation</subject><subject>Hematologic and hematopoietic diseases</subject><subject>Humans</subject><subject>Immunoreactivity</subject><subject>INK4 protein</subject><subject>Leukemia</subject><subject>Leukemia, Lymphocytic, Chronic, B-Cell - diagnosis</subject><subject>Leukemia, Lymphocytic, Chronic, B-Cell - genetics</subject><subject>Leukemia, Lymphocytic, Chronic, B-Cell - metabolism</subject><subject>Leukemias. Malignant lymphomas. Malignant reticulosis. 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Malignant lymphomas. Malignant reticulosis. 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Four immunohistochemical patterns of p53 and p21(Waf1) expression were observed: (1) p53-/p21- in 10 of 15 CLL (67%), but only in two of six RS (33%); (2) p53+/p21+ in three CLL (20%) and two RS (33%); (3) p53-/p21+ in one RS; and (4) p53++/p21- in two CLL and one RS. Two p53+/p21+ CLL evolved into RS. p53 mutations clustered around the p53++/p21- (two CLL and one RS) and p53-/p21- (one CLL and one RS) tumors. While the majority of CLL displayed strong p27 immunoreactivity, RS tumors were constantly p27-negative. p27(Kip1) gene was in germline configuration in all the tumors analyzed. Most CLL cases were negative for Rb expression. In contrast, all RS exhibited strong Rb expression. Cyclin D1 overexpression was only detected in one CLL evolving into RS and one RS. In conclusion, a p53+/p21- immunohistochemical pattern is shown exclusively by p53-mutated CLL/RS. Additionally, our results suggest a possible implication of moderate/strong p21(Waf1) expression, loss of p27 expression, and cyclin D1 overexpression in the Richter's transformation of CLL.</abstract><cop>London</cop><pub>Nature Publishing</pub><pmid>12040434</pmid><doi>10.1038/sj.leu.2402529</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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subjects Abnormalities
Adult
Aged
Biological and medical sciences
Cancer
Cell Cycle
Cell Cycle Proteins - metabolism
Chronic lymphocytic leukemia
Configurations
Cyclin D1
Cyclin D1 - metabolism
Cyclin-Dependent Kinase Inhibitor p21
Cyclin-Dependent Kinase Inhibitor p27
Cyclins - metabolism
Female
Genes, p53
Genetic aspects
Genetic transformation
Hematologic and hematopoietic diseases
Humans
Immunoreactivity
INK4 protein
Leukemia
Leukemia, Lymphocytic, Chronic, B-Cell - diagnosis
Leukemia, Lymphocytic, Chronic, B-Cell - genetics
Leukemia, Lymphocytic, Chronic, B-Cell - metabolism
Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis
Lymphatic leukemia
Lymphoma, Large B-Cell, Diffuse - diagnosis
Lymphoma, Large B-Cell, Diffuse - genetics
Lymphoma, Large B-Cell, Diffuse - metabolism
Male
Medical sciences
Middle Aged
Mutation
p53 Protein
Retina
Retinoblastoma
Retinoblastoma Protein - metabolism
Transformations
Tumor Suppressor Proteins - metabolism
Tumors
title Multiple cell cycle regulator alterations in Richter's transformation of chronic lymphocytic leukemia
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