- 5.Tumor considered as inoperable after evaluation by a multidisciplinary team (surgeon, medical oncologist and radiation oncologist). Criteria include : Technical unresectablility-ie tumor fixation/invasion to base of the skull or cervical vertebrae involvement of the nasopharynx and fixed lymph nodes; Physician's decision based on low surgical curability which includes all T3-4 stages, all N2-3 stages excluding T1N2; organ preservation.