A two-phase study model for the standardization of HER2 immunohistochemical assay on invasive ductal carcinoma of the breast.
Artigo
em Inglês
| IMSEAR
| ID: sea-38122
ABSTRACT
OBJECTIVES:
To develop and verify a standardized protocol for HER2 immunohistochemical assays on invasive ductal carcinoma of the breast in Thailand. MATERIAL ANDMETHOD:
A two-phase study approach was employed. In the Phase One, after verifying the proposed protocol that adopted the HercepTest procedure using readily available primary antibodies, CB11 and A0485, Lab 1 performed the HER2 immunohistochemical staining for 137 cases of invasive ductal carcinoma twice with two types of the antibody. Nine pathologists from 8 centers independently examined and scored all the 2 x 137 stained slides that were blinded for antibody type. Interobserver reliability was calculated using pair-wise kappa. Following discussion of the results, the Phase Two study was planned. Lab 2 and Lab 3 independently performed the HER2 staining according to the protocol for 60 invasive breast carcinoma cases. The same group of pathologists scored 2 x 60 stained slides that were masked for laboratories. Interobserver reliability and interlaboratory agreement from each pathologist were calculated using kappa statistics. Three interpreted categories--namely negative, equivocal and positive tests were used in the analyses.RESULTS:
Phase One study showed interobserver agreement between pairs varied from kappa 0.75 (95%CI, 0.68-0.82) to 0.06 (95%CI, 0-0.14) while Phase Two study obtained pair-wise kappa scores ranged from 0.84 (95%CI, 0. 80-0.89) to 0. 65 (95%CI, 0.59-0.71). Interlaboratory kappa for each pathologist was 0.67 (95%CI, 0.61-0.73).CONCLUSION:
The standardization of HER2 immunohistochemical assay was achieved through this two-phase study model. It had added benefits of improving pathologists' expertise and verifying the HER2 testing protocol to be used in Thailand.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Patologia Clínica
/
Tailândia
/
Neoplasias da Mama
/
Feminino
/
Humanos
/
Imuno-Histoquímica
/
Protocolos Clínicos
/
Carcinoma Ductal de Mama
/
Receptor ErbB-2
/
Genes erbB-2
Tipo de estudo:
Guia de Prática Clínica
/
Estudo prognóstico
País/Região como assunto:
Ásia
Idioma:
Inglês
Ano de publicação:
2005
Tipo de documento:
Artigo
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