If the contra-lateral lymph nodes are compromised, or if there is a direct invasion of the mediastinum, it is classified as stage IIIB. Patients in this stage are referred for chemoradiotherapy.
Si hay compromiso de ganglios contralaterales o invasión directa al mediastino es un estado IIIB, y son enviados a quimiorradioterapia con una sobrevida a 5 años menor del 5% 7.