“…The performance of a node clearing procedure, even when the neck is clinically negative, has radically altered the incidence of neck failure from recurrent disease (5.7% in this series). Our incidence of relapse in the negative operated neck is low compared to other studies, (Spiro et al, 1988;Francheschi et al, 1993;Hughes et al, 1993) but our findings emphasise the importance of including Level IV in neck dissections for all tumours involving oral cavity even when the neck is clinically negative.…”