Los investigadores llevaron a cabo el seguimiento de 289 pacientes sometidos a cirugía, que fueron distribuidos aleatoriamente para recibir varias combinaciones de quimioterapia y radioterapia o ningún tratamiento.
La supervivencia estimada a 5 años en el grupo que no recibió terapia alguna tras la cirugía fue del 11%. En comparación, la tasa entre aquellos que recibieron quimioterapia fue del 29%. Por el contrario, la combinación de quimioterapia y radioterapia da lugar a una tasa de supervivencia mucho más baja, sólo del 7%.
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New England Journal of Medicine
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