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Análisis completo de la hipermutación en el cáncer humano
Brittany B Campbell1, Nicholas Light2, David Fabrizio3
1Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON, Canada; The Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, ON, Canada; Institute of Medical Science, Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
Cell
|October 24, 2017
Resumen
Este estudio analizó más de 81.000 tumores, revelando nuevas causas de hipermutación e identificando distintos subgrupos de pacientes. Los resultados mejoran la comprensión de la evolución del cáncer e informan las aplicaciones clínicas.
Área de la Ciencia:
- La genómica
- En el campo de la oncología
- Biología del cáncer
Sus antecedentes:
- La carga de mutación tumoral varía significativamente entre los tipos de cáncer.
- La hipermutación puede surgir de varios factores, incluida la quimioterapia, los carcinógenos y las alteraciones de la línea germinal.
- Comprender los impulsores de la hipermutación es crucial para la clasificación y el tratamiento del cáncer.
Objetivo del estudio:
- Realizar una evaluación extensa de la carga de mutación en una gran cohorte de tumores pediátricos y adultos.
- Identificar nuevas mutaciones impulsoras y comprender el impacto de la deficiencia de reparación de la replicación y la inestabilidad del microsatélite en la carga de mutación.
- Para revelar subgrupos clínicamente relevantes basados en el contexto mutacional e informar el diseño de ensayos clínicos futuros.
Principales métodos:
- El análisis de secuencias de más de 81.000 tumores.
- Un agrupamiento imparcial basado en el contexto mutacional.
- Identificación y análisis de las firmas mutacionales.
Principales resultados:
- Se observaron hipermutaciones en tipos de tumores no asociados previamente con una alta carga de mutaciones.
- La deficiencia de reparación de la replicación fue un factor contribuyente importante, con nuevas mutaciones conductor identificadas en las polimerasas de ADN.
- Las firmas mutacionales revelaron un tratamiento previo y una deficiencia en la reparación de la replicación de la línea germinal, lo que ayudó al manejo del paciente.
- La agrupación identificó subgrupos clínicamente relevantes independientemente del origen del tumor, lo que indica una dinámica evolutiva compartida.
Conclusiones:
- Este estudio proporciona un panorama completo de la carga de mutación en diversos tipos de cáncer.
- Los hallazgos destacan el papel significativo de la deficiencia de reparación de la replicación y la inestabilidad del microsatélite en la conducción de la hipermutación.
- Los resultados informarán la clasificación de tumores, las estrategias de pruebas genéticas y el diseño de ensayos clínicos de oncología de precisión.
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