Científicos alemanes de la Facultad de Medicine de Hannover utilizaron un virus como vector para liberar un gen en células de la médula ósea de los roedores. Estas células se trasplantaron a un grupo de 10 animales, pero se observó que todos ellos acabaron desarrollando trastornos hematológicos, entre ellos una forma de leucemia mieloide similar a la humana.
Este hallazgo sugiere, en opinión de los autores, que insertar genes en las células del organismo puede, aunque en raros casos, conducir al desarrollo de neoplasias.
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