Postradiotherapy neck dissection for lymph node-positive head and neck cancer: the use of computed tomography to manage the neck.
OBJECTIVE
To determine how to use node response on computed tomography (CT) to indicate the need for neck dissection.


METHODS
Five hundred fifty patients with lymph node-positive head and neck cancer were treated between 1990 and 2002 with radiotherapy (RT) at a median dose of 74.4 Gy; 24% of these patients (n = 133) were treated with chemotherapy. Three hundred forty-one patients (62%) underwent planned post-RT neck dissection. Physical examination and contrast-enhanced CT were performed 30 days after completion of RT. CT images were reviewed in 211 patients for lymph node size (largest axial dimension) and presence of a focal abnormality (lucency, enhancement, or calcification). By correlating post-RT CT to neck dissection pathology, criteria associated with a low likelihood of residual disease were identified. A subset of patients who fit these criteria of radiographic response who did not undergo post-RT neck dissection was observed for recurrence.


RESULTS
Radiographic complete response (rCR) was defined as the absence of any large (> 1.5 cm) or focally abnormal lymph node. Correlation of response with neck dissection pathology indicated a negative predictive value of 77% for complete clinical response and 94% for rCR. In 32 patients (median follow-up time, 3.2 years) with rCR who did not undergo post-RT neck dissection, the 5-year ultimate neck control rate (100%) and cause-specific survival rate (72%) were not significantly different from the rates of patients with a negative post-RT neck dissection.


CONCLUSIONS
Patients with rCR 4 weeks after RT can be spared from a post-RT neck dissection regardless of initial node stage.
Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL, USA.
Stanley L
SL
Liauw
Anthony A
AA
Mancuso
Robert J
RJ
Amdur
Christopher G
CG
Morris
Douglas B
DB
Villaret
John W
JW
Werning
William M
WM
Mendenhall
D000328:Adult; D000368:Aged; D005260:Female; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy / Q000601:surgery*; D006801:Humans; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D018365:Neoplasm, Residual; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D016019:Survival Analysis; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome