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dc.contributor.authorRhodes, Anthony
dc.contributor.authorJasani, Bharat
dc.contributor.authorBalaton, Andre J
dc.contributor.authorBarnes, Diana M
dc.contributor.authorAnderson, Elizabeth
dc.contributor.authorBobrow, Lynda G
dc.contributor.authorMiller, Keith D
dc.date.accessioned2009-11-10T10:40:45Z
dc.date.available2009-11-10T10:40:45Z
dc.date.issued2001-01
dc.identifier.citationStudy of interlaboratory reliability and reproducibility of estrogen and progesterone receptor assays in Europe. Documentation of poor reliability and identification of insufficient microwave antigen retrieval time as a major contributory element of unreliable assays. 2001, 115 (1):44-58 Am. J. Clin. Pathol.en
dc.identifier.issn0002-9173
dc.identifier.pmid11190807
dc.identifier.doi10.1309/H905-HYC1-6UQQ-981P
dc.identifier.urihttp://hdl.handle.net/10541/85765
dc.description.abstractImmunohistochemical assays for estrogen receptors (ERs) and progesterone receptors (PRs) have not been surveyed for technical validity. In the present study, the reliability of the immunohistochemical assay for ER and PR was evaluated using data from 105 laboratories participating in external quality assessment (EQA) during a 2-year period. Technical variables associated with reliable immunostaining were analyzed. The efficiency of the antigen retrieval step was identified as the single most important contributory factor influencing the overall reproducibility of the assays. Reliable assays were found in 24 (36%) of 66 laboratories participating in continual EQA, including the majority of centers known to have clinically validated results. Inadequate assay sensitivity, with subsequent weak staining, was the main cause of poor and variable results by laboratories using microwave antigen retrieval; too short a heating time was identified as the principal contributory factor. Extension of the heating time resulted in significant improvement regardless of all other variables in the immunohistochemical protocol. Continual participation in EQA is an effective means for identifying and ameliorating variables that influence the reliability of immunohistochemical assays for predictive markers, thereby assisting in technical validation and standardization.
dc.language.isoenen
dc.subjectOestrogen Receptorsen
dc.subject.meshAntigens
dc.subject.meshEurope
dc.subject.meshHot Temperature
dc.subject.meshHumans
dc.subject.meshImmunohistochemistry
dc.subject.meshLaboratories
dc.subject.meshMicrowaves
dc.subject.meshReceptors, Estrogen
dc.subject.meshReceptors, Progesterone
dc.subject.meshReproducibility of Results
dc.subject.meshTime Factors
dc.titleStudy of interlaboratory reliability and reproducibility of estrogen and progesterone receptor assays in Europe. Documentation of poor reliability and identification of insufficient microwave antigen retrieval time as a major contributory element of unreliable assays.en
dc.typeArticleen
dc.contributor.departmentUnited Kingdom National External Quality Assessment Scheme for Immunocytochemistry and the Department of Histopathology, University College London Medical School, London, England.en
dc.identifier.journalAmerican Journal of Clinical Pathologyen
html.description.abstractImmunohistochemical assays for estrogen receptors (ERs) and progesterone receptors (PRs) have not been surveyed for technical validity. In the present study, the reliability of the immunohistochemical assay for ER and PR was evaluated using data from 105 laboratories participating in external quality assessment (EQA) during a 2-year period. Technical variables associated with reliable immunostaining were analyzed. The efficiency of the antigen retrieval step was identified as the single most important contributory factor influencing the overall reproducibility of the assays. Reliable assays were found in 24 (36%) of 66 laboratories participating in continual EQA, including the majority of centers known to have clinically validated results. Inadequate assay sensitivity, with subsequent weak staining, was the main cause of poor and variable results by laboratories using microwave antigen retrieval; too short a heating time was identified as the principal contributory factor. Extension of the heating time resulted in significant improvement regardless of all other variables in the immunohistochemical protocol. Continual participation in EQA is an effective means for identifying and ameliorating variables that influence the reliability of immunohistochemical assays for predictive markers, thereby assisting in technical validation and standardization.


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