Predictive factors of breast cancer evaluated by immunohistochemistry

Detalhes bibliográficos
Autor(a) principal: Gobbi,Helenice
Data de Publicação: 2008
Outros Autores: Rocha,Rafael Malagoli, Nunes,Cristiana Buzelin
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Jornal Brasileiro de Patologia e Medicina Laboratorial (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1676-24442008000200010
Resumo: Hormone receptor and Her2 protein overexpression evaluated by immunohistochemistry (IHC) is widely validated as a predictive factor in breast cancer. The quality of the IHC reaction is influenced by tissue fixation and processing. Over- and underfixation deeply affect IHC results. Antigen retrieval may improve IHC but it does not recover tissue from autolysis or overfixation. The choice of primary antibody for IHC as to its sensitivity and specificity in relation to therapeutic response represents an important stage. Apart from mouse monoclonal antibodies, new rabbit monoclonal antibodies are commercially available, such as clones anti-ER SP1 and B644, anti-PR SP2 and B645 and anti-Her2 SP3 and 4B5. They represent an alternative to hormone receptor and Her2 evaluation by IHC. New polymeric non-biotinylated detection systems are also available and allow accurate and strong marking with no stromal and no non-specific cytoplasmic staining due to endogenous biotin. The most recommended cut off for estrogen and progesterone receptors (ER and PR) is more than 1% of positive cells with moderate or strong staining intensity (Allred's scoring system). New guidelines for Her2 evaluation by IHC show a cut off of more than 30% of positive cells with strong intensity (3+) that correlates better with gene amplification. The 2+ cases are now considered indeterminate and should be confirmed by fluorescence in situ hybridisation (FISH) or chromogenic in situ hybridisation CISH. A quality control of pre-analytical, analytical and post-analytical phases of IHC is recommended in order to optimize results.
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spelling Predictive factors of breast cancer evaluated by immunohistochemistryEstrogen receptorProgesterone receptorHer2/neuHormone receptor and Her2 protein overexpression evaluated by immunohistochemistry (IHC) is widely validated as a predictive factor in breast cancer. The quality of the IHC reaction is influenced by tissue fixation and processing. Over- and underfixation deeply affect IHC results. Antigen retrieval may improve IHC but it does not recover tissue from autolysis or overfixation. The choice of primary antibody for IHC as to its sensitivity and specificity in relation to therapeutic response represents an important stage. Apart from mouse monoclonal antibodies, new rabbit monoclonal antibodies are commercially available, such as clones anti-ER SP1 and B644, anti-PR SP2 and B645 and anti-Her2 SP3 and 4B5. They represent an alternative to hormone receptor and Her2 evaluation by IHC. New polymeric non-biotinylated detection systems are also available and allow accurate and strong marking with no stromal and no non-specific cytoplasmic staining due to endogenous biotin. The most recommended cut off for estrogen and progesterone receptors (ER and PR) is more than 1% of positive cells with moderate or strong staining intensity (Allred's scoring system). New guidelines for Her2 evaluation by IHC show a cut off of more than 30% of positive cells with strong intensity (3+) that correlates better with gene amplification. The 2+ cases are now considered indeterminate and should be confirmed by fluorescence in situ hybridisation (FISH) or chromogenic in situ hybridisation CISH. A quality control of pre-analytical, analytical and post-analytical phases of IHC is recommended in order to optimize results.Sociedade Brasileira de Patologia Clínica2008-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1676-24442008000200010Jornal Brasileiro de Patologia e Medicina Laboratorial v.44 n.2 2008reponame:Jornal Brasileiro de Patologia e Medicina Laboratorial (Online)instname:Sociedade Brasileira de Patologia (SBP)instacron:SBP10.1590/S1676-24442008000200010info:eu-repo/semantics/openAccessGobbi,HeleniceRocha,Rafael MalagoliNunes,Cristiana Buzelineng2008-07-04T00:00:00Zoai:scielo:S1676-24442008000200010Revistahttp://www.scielo.br/jbpmlhttps://old.scielo.br/oai/scielo-oai.php||jbpml@sbpc.org.br1678-47741676-2444opendoar:2008-07-04T00:00Jornal Brasileiro de Patologia e Medicina Laboratorial (Online) - Sociedade Brasileira de Patologia (SBP)false
dc.title.none.fl_str_mv Predictive factors of breast cancer evaluated by immunohistochemistry
title Predictive factors of breast cancer evaluated by immunohistochemistry
spellingShingle Predictive factors of breast cancer evaluated by immunohistochemistry
Gobbi,Helenice
Estrogen receptor
Progesterone receptor
Her2/neu
title_short Predictive factors of breast cancer evaluated by immunohistochemistry
title_full Predictive factors of breast cancer evaluated by immunohistochemistry
title_fullStr Predictive factors of breast cancer evaluated by immunohistochemistry
title_full_unstemmed Predictive factors of breast cancer evaluated by immunohistochemistry
title_sort Predictive factors of breast cancer evaluated by immunohistochemistry
author Gobbi,Helenice
author_facet Gobbi,Helenice
Rocha,Rafael Malagoli
Nunes,Cristiana Buzelin
author_role author
author2 Rocha,Rafael Malagoli
Nunes,Cristiana Buzelin
author2_role author
author
dc.contributor.author.fl_str_mv Gobbi,Helenice
Rocha,Rafael Malagoli
Nunes,Cristiana Buzelin
dc.subject.por.fl_str_mv Estrogen receptor
Progesterone receptor
Her2/neu
topic Estrogen receptor
Progesterone receptor
Her2/neu
description Hormone receptor and Her2 protein overexpression evaluated by immunohistochemistry (IHC) is widely validated as a predictive factor in breast cancer. The quality of the IHC reaction is influenced by tissue fixation and processing. Over- and underfixation deeply affect IHC results. Antigen retrieval may improve IHC but it does not recover tissue from autolysis or overfixation. The choice of primary antibody for IHC as to its sensitivity and specificity in relation to therapeutic response represents an important stage. Apart from mouse monoclonal antibodies, new rabbit monoclonal antibodies are commercially available, such as clones anti-ER SP1 and B644, anti-PR SP2 and B645 and anti-Her2 SP3 and 4B5. They represent an alternative to hormone receptor and Her2 evaluation by IHC. New polymeric non-biotinylated detection systems are also available and allow accurate and strong marking with no stromal and no non-specific cytoplasmic staining due to endogenous biotin. The most recommended cut off for estrogen and progesterone receptors (ER and PR) is more than 1% of positive cells with moderate or strong staining intensity (Allred's scoring system). New guidelines for Her2 evaluation by IHC show a cut off of more than 30% of positive cells with strong intensity (3+) that correlates better with gene amplification. The 2+ cases are now considered indeterminate and should be confirmed by fluorescence in situ hybridisation (FISH) or chromogenic in situ hybridisation CISH. A quality control of pre-analytical, analytical and post-analytical phases of IHC is recommended in order to optimize results.
publishDate 2008
dc.date.none.fl_str_mv 2008-04-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1676-24442008000200010
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1676-24442008000200010
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dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv
Sociedade Brasileira de Patologia Clínica
publisher.none.fl_str_mv
Sociedade Brasileira de Patologia Clínica
dc.source.none.fl_str_mv Jornal Brasileiro de Patologia e Medicina Laboratorial v.44 n.2 2008
reponame:Jornal Brasileiro de Patologia e Medicina Laboratorial (Online)
instname:Sociedade Brasileira de Patologia (SBP)
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reponame_str Jornal Brasileiro de Patologia e Medicina Laboratorial (Online)
collection Jornal Brasileiro de Patologia e Medicina Laboratorial (Online)
repository.name.fl_str_mv Jornal Brasileiro de Patologia e Medicina Laboratorial (Online) - Sociedade Brasileira de Patologia (SBP)
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