The incidence and significance of retropharyngeal lymph node metastases in hypopharyngeal cancer.
OBJECTIVE
To evaluate the incidence and clinical significance of retropharyngeal lymph node metastasis in hypopharyngeal cancer.


METHODS
Pretreatment computed tomography and/or magnetic resonance images of 152 patients treated between 1998 and 2009 were retrospectively reviewed. The prognostic significance of retropharyngeal lymph node metastasis for 116 patients who received definitive treatment was also analyzed.


RESULTS
Twelve patients (8%) were radiologically positive for retropharyngeal lymph node metastasis. Tumors originating from the posterior wall showed significantly higher incidence of retropharyngeal lymph node than those originating from other sites (23.8 vs. 5.3%, P = 0.01). The majority of patients with retropharyngeal lymph node involvement experienced distant metastasis. The overall survival rate of patients with retropharyngeal lymph node metastasis was worse than in those lacking retropharyngeal lymph node involvement (0 vs. 68.8% at 2 years, P < 0.01), and so was the cause-specific survival rate (0 vs. 74% at 2 years, P < 0.01).


CONCLUSIONS
Patients with hypopharyngeal cancer, especially those with posterior wall tumors, are at high risk for retropharyngeal lymph node involvement. Patients with retropharyngeal lymph node metastasis developed distant metastasis frequently, and showed dismal outcomes.
Department of Radiology, Chiba University Hospital, 1-8-1 Inohana, Chiba 260-8677, Japan. rintaroharada@gmail.com
Rintaro
R
Harada
Koichi
K
Isobe
Miho
M
Watanabe
Hiroki
H
Kobayashi
Takuro
T
Horikoshi
Ken
K
Motoori
Toyoyuki
T
Hanazawa
Yoshitaka
Y
Okamoto
Hisao
H
Ito
Takashi
T
Uno
D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D059186:Chemoradiotherapy, Adjuvant; D019583:Dose Fractionation, Radiation; D005260:Female; D006801:Humans; D007012:Hypopharyngeal Neoplasms / Q000000981:diagnostic imaging / Q000401:mortality / Q000473:pathology* / Q000628:therapy*; D015994:Incidence; D053208:Kaplan-Meier Estimate; D016015:Logistic Models; D008198:Lymph Nodes / Q000000981:diagnostic imaging / Q000473:pathology*; D008207:Lymphatic Metastasis / Q000175:diagnosis; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D037981:Neck Dissection; D009367:Neoplasm Staging; D010166:Palliative Care; D010611:Pharyngectomy; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome