Evaluación de tres métodos moleculares para el rastreo e identificación de HER2/neu en pacientes con cáncer de mama
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Objetivo: comparar las técnicas de IHQ, FISH y PCR cuantitativa en tiempo real, en la determinación de la amplificación y sobre-expresión de HER2/neu en 70 tumores de mama.
Metodología: se evaluaron las características operativas de la IHQ HercepTest y la PCR cuantitativa en tiempo real. Para ello se tomó como estándar de oro la hibridización fluorescente in situ. Se determinó el porcentaje de positividad de tumores de mama que tienen amplificación génica de HER2/neu.
Resultados: el 38% de tumores de mama muestra amplificación para HER2/neu, de acuerdo con la PCR en tiempo real. Se encontró una concordancia del 80% entre la PCR en tiempo real y la FISH en los casos catalogados como equívocos grado 2+ por IHQ.
Conclusión: los resultados obtenidos sugieren que los análisis por PCR en tiempo real son una alternativa válida en casos en los que se pueda usar la técnica de FISH para la reevaluación de los tumores de mama catalogados equívocos o grado 2+ para HER2/neu por IHQ. Mediante la combinación de la IHQ y la PCR cuantitativa en tiempo real se puede llegar a una buena
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