Methylation of p16(INK4A) and p57(KIP2) are involved in the development and progression of gastric MALT lymphomas

p16(INK4A) and p57(KIP2) are inhibitors of cyclin-dependent kinases and their inactivation by methylation has been reported as a major tumorigenic mechanism in tumors. To examine whether methylation of p16(INK4A) and p57(KIP2) is involved in the development and progression of gastric MALT lymphomas,...

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Veröffentlicht in:Modern pathology 2006-01, Vol.19 (1), p.141-148
Hauptverfasser: Min, Ki Ouk, Seo, Eun Joo, Kwon, Hi Jeong, Lee, Eui Jin, Kim, Won Il, Kang, Chang Suk, Kim, Kyoung-Mee
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container_end_page 148
container_issue 1
container_start_page 141
container_title Modern pathology
container_volume 19
creator Min, Ki Ouk
Seo, Eun Joo
Kwon, Hi Jeong
Lee, Eui Jin
Kim, Won Il
Kang, Chang Suk
Kim, Kyoung-Mee
description p16(INK4A) and p57(KIP2) are inhibitors of cyclin-dependent kinases and their inactivation by methylation has been reported as a major tumorigenic mechanism in tumors. To examine whether methylation of p16(INK4A) and p57(KIP2) is involved in the development and progression of gastric MALT lymphomas, 24 gastric low-grade lymphomas of MALT, 11 diffuse large B-cell lymphomas, and 10 each case of gastric lymphoid follicles with and without Helicobacter pylori infection were studied. H. pylori infection was positive in 85.7% of the gastric lymphomas. In the gastric lymphoid follicles positive for H. pylori, methylation of p16(INK4A) was detected in 10% of cases, while methylation of p57(KIP2) was not detected. In low-grade MALT lymphomas, p16(INK4A) and p57(KIP2) were methylated in 41.7 and 29.2% of the cases, respectively. In diffuse large B-cell lymphomas, methylation of p16(INK4A) and p57(KIP2) was found in 72.7 and 36.4% of the cases, respectively. All but one case with p16(INK4A) and p57(KIP2) methylation was H. pylori positive and most of them were stage I. Our results indicate that methylation of p16(INK4A) followed by p57(KIP2) methylation involves during the tumorigenesis of gastric MALT lymphomas associated with H. pylori infection. As methylation of these two genes was more frequent in the higher grade (P
doi_str_mv 10.1038/modpathol.3800505
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To examine whether methylation of p16(INK4A) and p57(KIP2) is involved in the development and progression of gastric MALT lymphomas, 24 gastric low-grade lymphomas of MALT, 11 diffuse large B-cell lymphomas, and 10 each case of gastric lymphoid follicles with and without Helicobacter pylori infection were studied. H. pylori infection was positive in 85.7% of the gastric lymphomas. In the gastric lymphoid follicles positive for H. pylori, methylation of p16(INK4A) was detected in 10% of cases, while methylation of p57(KIP2) was not detected. In low-grade MALT lymphomas, p16(INK4A) and p57(KIP2) were methylated in 41.7 and 29.2% of the cases, respectively. In diffuse large B-cell lymphomas, methylation of p16(INK4A) and p57(KIP2) was found in 72.7 and 36.4% of the cases, respectively. All but one case with p16(INK4A) and p57(KIP2) methylation was H. pylori positive and most of them were stage I. Our results indicate that methylation of p16(INK4A) followed by p57(KIP2) methylation involves during the tumorigenesis of gastric MALT lymphomas associated with H. pylori infection. 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Our results indicate that methylation of p16(INK4A) followed by p57(KIP2) methylation involves during the tumorigenesis of gastric MALT lymphomas associated with H. pylori infection. 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To examine whether methylation of p16(INK4A) and p57(KIP2) is involved in the development and progression of gastric MALT lymphomas, 24 gastric low-grade lymphomas of MALT, 11 diffuse large B-cell lymphomas, and 10 each case of gastric lymphoid follicles with and without Helicobacter pylori infection were studied. H. pylori infection was positive in 85.7% of the gastric lymphomas. In the gastric lymphoid follicles positive for H. pylori, methylation of p16(INK4A) was detected in 10% of cases, while methylation of p57(KIP2) was not detected. In low-grade MALT lymphomas, p16(INK4A) and p57(KIP2) were methylated in 41.7 and 29.2% of the cases, respectively. In diffuse large B-cell lymphomas, methylation of p16(INK4A) and p57(KIP2) was found in 72.7 and 36.4% of the cases, respectively. All but one case with p16(INK4A) and p57(KIP2) methylation was H. pylori positive and most of them were stage I. Our results indicate that methylation of p16(INK4A) followed by p57(KIP2) methylation involves during the tumorigenesis of gastric MALT lymphomas associated with H. pylori infection. As methylation of these two genes was more frequent in the higher grade (P&lt;0.05), it may contribute to the malignant progression of gastric MALT lymphomas.</abstract><cop>United States</cop><pmid>16357845</pmid><doi>10.1038/modpathol.3800505</doi><tpages>8</tpages></addata></record>
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subjects Adult
Aged
Cyclin-Dependent Kinase Inhibitor p16 - genetics
Cyclin-Dependent Kinase Inhibitor p57 - genetics
Disease Progression
DNA Methylation
Female
Helicobacter Infections - complications
Humans
Lymphoma, B-Cell, Marginal Zone - complications
Lymphoma, B-Cell, Marginal Zone - genetics
Lymphoma, B-Cell, Marginal Zone - pathology
Male
Middle Aged
Polymerase Chain Reaction - methods
Stomach Neoplasms - complications
Stomach Neoplasms - genetics
Stomach Neoplasms - pathology
title Methylation of p16(INK4A) and p57(KIP2) are involved in the development and progression of gastric MALT lymphomas
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