title: Management of contralateral N0 neck in tonsillar squamous cell carcinoma.
abstract: OBJECTIVE
  It is well established that tonsillar squamous cell carcinomas have a high probability of disseminating to the neck. An ipsilateral neck treatment is mandatory during initial treatment of stages II to IV tonsillar carcinomas. However, as of yet, no consensus exists whether to perform elective contralateral neck management.
  
  
  METHODS
  A retrospective analysis of 43 N0-3 tonsillar cancer patients with contralateral clinically negative necks from 1992 to 2002 was performed. All patients had a contralateral elective neck dissection. Surgical treatment was followed by postoperative radiotherapy in 33 patients. The follow-up period ranged from 2 to 120 (mean 38) months. The Kaplan-Meier method and log-rank test were used to calculate the disease-specific survival rates and prognostic significance of contralateral occult lymph node metastasis.
  
  
  RESULTS
  Clinically negative, but pathologically positive, contralateral lymph nodes occurred in 16% (7 of 43). Of the 33 cases with an ipsilateral node positive neck, contralateral occult lymph node metastases developed in 21% (7 of 33), in contrast with 0% in ipsilateral N0 necks. On the basis of the clinical staging of the tumor, 5% (1 of 22) of the cases showed lymph node metastases in T2 tumors, 36% (5 of 14) in T3, and 25% (1 of 4) in T4. None of the T1 tumors (3 cases) had pathologically positive lymph nodes (T1 + T2 vs. T3 + T4, P < .05). Patients with no evidence of contralateral nodal cancer had significantly improved disease-specific survival over patients with any pathologically positive nodes (5 year disease-specific survival rate 92% vs. 28%, P = < .05).
  
  
  CONCLUSIONS
  The risk of contralateral occult neck involvement in above T3 staged tonsillar squamous cell carcinomas with unilateral metastases was high (approximately 21%), and patients who present with a contralateral metastatic neck have a worse prognosis than those who are staged as N0. Therefore, we advocate an elective contralateral neck treatment in tonsillar squamous cell carcinoma patients with ipsilateral node metastases.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Konkuk University College of Medicine, Seoul, Korea.
authors.forename: Young Chang
authors.initials: YC
authors.lastname: Lim
authors.forename: Sei Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Jae-Yol
authors.initials: JY
authors.lastname: Lim
authors.forename: Hyang Ae
authors.initials: HA
authors.lastname: Shin
authors.forename: Jin Seok
authors.initials: JS
authors.lastname: Lee
authors.forename: Bon Seok
authors.initials: BS
authors.lastname: Koo
authors.forename: Se-Heon
authors.initials: SH
authors.lastname: Kim
authors.forename: Eun Chang
authors.initials: EC
authors.lastname: Choi
mesh_terms: D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000401:mortality / Q000473:pathology* / Q000532:radiotherapy / Q000601:surgery*; D017558:Elective Surgical Procedures; D005260:Female; D006258:Head and Neck Neoplasms / Q000401:mortality / Q000473:pathology / Q000532:radiotherapy / Q000556:secondary* / Q000601:surgery*; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology; D008207:Lymphatic Metastasis / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D012189:Retrospective Studies; D014067:Tonsillar Neoplasms / Q000401:mortality / Q000473:pathology*