Results of a Phase 2 Study Examining the Effects of Omitting Elective Neck Irradiation to Nodal Levels IV and Vb in Patients With N0-1 Nasopharyngeal Carcinoma

The rate of out-of-field nodal failure when omitting ENI to levels IV and Vb in clinically negative necks of patients with N0-1 NPC was extremely low; therefore, a further phase 3 study is warranted.