title: Role of planned neck dissection for advanced metastatic disease in tongue base or tonsil squamous cell carcinoma treated with radiotherapy.
abstract: OBJECTIVE
  At the conclusion of this article, the reader should be able to discuss the need for planned neck dissection for advanced cervical diseases in the tongue base and tonsil cancer after treatment with radiotherapy.
  
  
  BACKGROUND
  In the past 5 years, we have treated patients with squamous cell carcinoma of the tonsil and tongue base with radiotherapy as the primary therapeutic modality. A planned complete neck dissection was performed on all patients with N2 or greater cervical disease regardless of response to radiotherapy. Composite resection was performed when there was persistent disease at the primary site. Although the "radiation-first" therapeutic approach for tongue base and tonsil cancer is widely accepted, the planned neck dissection for neck metastases remans controversial. The objective of the study was to determine the validity of planned neck dissection after radiotherapy for N2 disease.
  
  
  METHODS
  Medical records of patients with primary squamous cell carcinoma of the tongue base and tonsil with neck metastasis staged N2 or greater were reviewed. Between 1994 and 1999, 36 such patients were treated with curative radiation therapy. Response was assessed 6 to 8 weeks after completion of treatment with clinical examination and CT imaging. All patients underwent planned neck dissection. We reviewed the clinical and radiographic response of neck disease to radiotherapy as it correlated with the histopathologic findings.
  
  
  RESULTS
  Of the 36 patients, 17 had clinical and CT evidence of persistent disease. In this group, 65% had pathologically confirmed diseases at surgery. Of the 9 patients with no evidence of disease on clinical examination, negative biopsy at the primary site, and a negative CT scan, 33% (three of nine) still had residual disease in the neck dissection specimen.
  
  
  CONCLUSIONS
  Positive findings on clinical examination and CT can predict the presence of malignancy after radiation therapy. However, a negative CT and clinical examination are limited in predicting a complete response. These data lend support to the role of planned neck dissection after radiotherapy of N2 neck disease.
authors: Department of Otolaryngology/Head & Neck Surgery, University of Minnesota School of Medicine, 401 South 1st St. #115, Minneapolis 55401, USA. bappa_roy@yahoo.com
authors: Saswata
authors: S
authors: Roy
authors: Robert J
authors: RJ
authors: Tibesar
authors: Kathleen
authors: K
authors: Daly
authors: Stephan
authors: S
authors: Pambucian
authors: H K
authors: HK
authors: Lee
authors: Markus
authors: M
authors: Gapany
authors: George L
authors: GL
authors: Adams
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy*; D003131:Combined Modality Therapy; D005260:Female; D006258:Head and Neck Neoplasms / Q000532:radiotherapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D037981:Neck Dissection; D011879:Radiotherapy Dosage; D014062:Tongue Neoplasms / Q000473:pathology / Q000556:secondary* / Q000628:therapy*; D014067:Tonsillar Neoplasms / Q000473:pathology / Q000556:secondary* / Q000628:therapy*