525 / 1481
Selecting node level to include in the CTV
Gregoire et al.
Radiother Oncol
2000; 56:135-50.
Tumor site
Level I
Level II Level III Level IV Level V Others
Oral cavity
58/96.5* 21/92 82/97 95/99 99/0 98.6/99.7
Oropharynx
87/98 19/76 77/95 91/97.5 87/97 98/99
Hypopharynx
98/100 20/87 49/96 80/97 76/98 97/99
Supraglottis
98/100 29/79 52/90 82/93 85/96 98/100
Nasopharynx
91/95 29/44 64/68 78/85 68/74 85/90
*ipsilateral/contralateral cervical lymph nodes
cN0 neck in head-and-neck cancer per node level [%]