Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Arquivos de gastroenterologia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-28032012000100007 |
Resumo: | CONTEXT: The appearance of adenomas and their progression to adenocarcinomas is the result of an accumulation of genetic changes in cells of the intestinal mucosa inherited or acquired during life. Several proteins have been studied in relation to the development and progression of colorectal cancer, including tumor protein p53 (p53) and antigen identified by monoclonal antibody Ki-67 (Ki-67). OBJECTIVE: To evaluate the expression of p53 and Ki-67 in colorectal adenomas and correlate the observed levels with clinical and pathologic findings. METHOD: The sample consisted of 50 adenomatous polyps from patients undergoing colonoscopy. After performing polypectomy, polyps were preserved in a formalin solution with 10% (vol./vol.) phosphate buffer, submitted for routine preparation of sections and slides and stained with hematoxylin and eosin. For each adenoma we then performed immunohistochemistry to detect specific p53 and Ki-67 proteins using a streptavidin-biotin-peroxidase enzyme immunoassay. RESULTS: p53 was detected in 18% of the adenomas. The average Ki-67 protein index (i.Ki-67) was 0.49. A statistically significant difference was observed in p53 (P = 0.0003) and Ki-67 (P = 0.02) expression between adenomas with low- and high-grade dysplasia, particularly for p53. The expression of Ki-67 was greater in rectal adenomas than in colic adenomas (P = 0.02). No relationship was found between the expression of the two proteins in the sample. CONCLUSION: The p53 protein is expressed in a proportion of adenomas, while the Ki-67 protein was expressed in all adenomas. The expression of p53 was higher in adenomas with high-grade dysplasia. The expression of Ki-67 was higher in rectal adenomas and in adenomas with high-grade dysplasia. |
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Arquivos de gastroenterologia (Online) |
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Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomasColorectal neoplasmTumor suppressor protein p53Ki67-antigenImmunohistochemistryCONTEXT: The appearance of adenomas and their progression to adenocarcinomas is the result of an accumulation of genetic changes in cells of the intestinal mucosa inherited or acquired during life. Several proteins have been studied in relation to the development and progression of colorectal cancer, including tumor protein p53 (p53) and antigen identified by monoclonal antibody Ki-67 (Ki-67). OBJECTIVE: To evaluate the expression of p53 and Ki-67 in colorectal adenomas and correlate the observed levels with clinical and pathologic findings. METHOD: The sample consisted of 50 adenomatous polyps from patients undergoing colonoscopy. After performing polypectomy, polyps were preserved in a formalin solution with 10% (vol./vol.) phosphate buffer, submitted for routine preparation of sections and slides and stained with hematoxylin and eosin. For each adenoma we then performed immunohistochemistry to detect specific p53 and Ki-67 proteins using a streptavidin-biotin-peroxidase enzyme immunoassay. RESULTS: p53 was detected in 18% of the adenomas. The average Ki-67 protein index (i.Ki-67) was 0.49. A statistically significant difference was observed in p53 (P = 0.0003) and Ki-67 (P = 0.02) expression between adenomas with low- and high-grade dysplasia, particularly for p53. The expression of Ki-67 was greater in rectal adenomas than in colic adenomas (P = 0.02). No relationship was found between the expression of the two proteins in the sample. CONCLUSION: The p53 protein is expressed in a proportion of adenomas, while the Ki-67 protein was expressed in all adenomas. The expression of p53 was higher in adenomas with high-grade dysplasia. The expression of Ki-67 was higher in rectal adenomas and in adenomas with high-grade dysplasia.Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia e Outras Especialidades - IBEPEGE. 2012-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-28032012000100007Arquivos de Gastroenterologia v.49 n.1 2012reponame:Arquivos de gastroenterologia (Online)instname:Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologiainstacron:IBEPEGE10.1590/S0004-28032012000100007info:eu-repo/semantics/openAccessSousa,Walysson Alves Tocantins deRodrigues,Lusmar VerasSilva Jr.,Raimundo Gerônimo daVieira,Fernando Lopeseng2012-04-02T00:00:00Zoai:scielo:S0004-28032012000100007Revistahttp://www.scielo.br/aghttps://old.scielo.br/oai/scielo-oai.php||secretariaarqgastr@hospitaligesp.com.br1678-42190004-2803opendoar:2012-04-02T00:00Arquivos de gastroenterologia (Online) - Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologiafalse |
dc.title.none.fl_str_mv |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
title |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
spellingShingle |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas Sousa,Walysson Alves Tocantins de Colorectal neoplasm Tumor suppressor protein p53 Ki67-antigen Immunohistochemistry |
title_short |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
title_full |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
title_fullStr |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
title_full_unstemmed |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
title_sort |
Immunohistochemical evaluation of p53 and Ki-67 proteins in colorectal adenomas |
author |
Sousa,Walysson Alves Tocantins de |
author_facet |
Sousa,Walysson Alves Tocantins de Rodrigues,Lusmar Veras Silva Jr.,Raimundo Gerônimo da Vieira,Fernando Lopes |
author_role |
author |
author2 |
Rodrigues,Lusmar Veras Silva Jr.,Raimundo Gerônimo da Vieira,Fernando Lopes |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Sousa,Walysson Alves Tocantins de Rodrigues,Lusmar Veras Silva Jr.,Raimundo Gerônimo da Vieira,Fernando Lopes |
dc.subject.por.fl_str_mv |
Colorectal neoplasm Tumor suppressor protein p53 Ki67-antigen Immunohistochemistry |
topic |
Colorectal neoplasm Tumor suppressor protein p53 Ki67-antigen Immunohistochemistry |
description |
CONTEXT: The appearance of adenomas and their progression to adenocarcinomas is the result of an accumulation of genetic changes in cells of the intestinal mucosa inherited or acquired during life. Several proteins have been studied in relation to the development and progression of colorectal cancer, including tumor protein p53 (p53) and antigen identified by monoclonal antibody Ki-67 (Ki-67). OBJECTIVE: To evaluate the expression of p53 and Ki-67 in colorectal adenomas and correlate the observed levels with clinical and pathologic findings. METHOD: The sample consisted of 50 adenomatous polyps from patients undergoing colonoscopy. After performing polypectomy, polyps were preserved in a formalin solution with 10% (vol./vol.) phosphate buffer, submitted for routine preparation of sections and slides and stained with hematoxylin and eosin. For each adenoma we then performed immunohistochemistry to detect specific p53 and Ki-67 proteins using a streptavidin-biotin-peroxidase enzyme immunoassay. RESULTS: p53 was detected in 18% of the adenomas. The average Ki-67 protein index (i.Ki-67) was 0.49. A statistically significant difference was observed in p53 (P = 0.0003) and Ki-67 (P = 0.02) expression between adenomas with low- and high-grade dysplasia, particularly for p53. The expression of Ki-67 was greater in rectal adenomas than in colic adenomas (P = 0.02). No relationship was found between the expression of the two proteins in the sample. CONCLUSION: The p53 protein is expressed in a proportion of adenomas, while the Ki-67 protein was expressed in all adenomas. The expression of p53 was higher in adenomas with high-grade dysplasia. The expression of Ki-67 was higher in rectal adenomas and in adenomas with high-grade dysplasia. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-28032012000100007 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-28032012000100007 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0004-28032012000100007 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia e Outras Especialidades - IBEPEGE. |
publisher.none.fl_str_mv |
Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia e Outras Especialidades - IBEPEGE. |
dc.source.none.fl_str_mv |
Arquivos de Gastroenterologia v.49 n.1 2012 reponame:Arquivos de gastroenterologia (Online) instname:Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia instacron:IBEPEGE |
instname_str |
Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia |
instacron_str |
IBEPEGE |
institution |
IBEPEGE |
reponame_str |
Arquivos de gastroenterologia (Online) |
collection |
Arquivos de gastroenterologia (Online) |
repository.name.fl_str_mv |
Arquivos de gastroenterologia (Online) - Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia |
repository.mail.fl_str_mv |
||secretariaarqgastr@hospitaligesp.com.br |
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1754193346218164224 |