title: Squamous cell carcinoma metastatic to cervical lymph nodes from an unknown primary site: the impact of radiotherapy.
abstract: OBJECTIVE
  Cervical lymph node metastases of squamous cell carcinoma from an unknown primary site constitute about 5% of the total head and neck cancer, cases. The management of these patients is still a therapeutic challenge. The aim of the present study was to analyze the prognosis in a series of patients and, in particular, the impact of different radiotherapy techniques on the prognosis.
  
  
  METHODS
  Data from 60 patients with cervical lymph node metastases of squamous cell carcinoma from an unknown primary site were reviewed. Nine of 60 patients (15.0%) received excisional biopsy. Radiotherapy was delivered to the bilateral neck and pharyngeal mucosa (extensive field) in 11 patients (18.3%), to the bilateral neck in 24 patients (40.0%), and to the ipsilateral neck in 25 patients (41.7%). Fourteen patients (23.3%) also received chemotherapy.
  
  
  RESULTS
  The 5-year overall survival rate of all patients was 68.5%. The overall survival of patients with N1, N2, and N3 stage was 100%, 68.0%, and 40.9%, respectively (P = 0.026). The overall survival of patients irradiated by ipsilateral neck, bilateral neck, and extensive field was 66.5%, 74.5%, and 54.6%, respectively (P = 0.5). At multivariate analysis, only N stage significantly affected overall survival (P = 0.032). The 5-year neck control rate of all patients was 65.6%. The neck control rate of patients with N1, N2, and N3 stage was 100%, 63.2%, and 34.6%, respectively (P = 0.064). The neck control rate of patients irradiated by ipsilateral neck, bilateral neck, and extensive field was 87.6%, 51.1%, and 72.7%, respectively (P = 0.279). Emergence of the occult primary was observed in 21.2% patients, and all of these occurred within the head and neck region. The primary tumor emerged in 23.3% of patients treated with ipsilateral and bilateral neck irradiation and in 12.5% of patients irradiated by extensive field (P = 0.469).
  
  
  CONCLUSIONS
  Patients with cervical lymph node metastases of squamous cell carcinoma from an unknown primary site have clinical features and a prognosis similar to those of other head and neck malignancies. Extensive irradiation results in a lower trend of emergence of the primary tumor than when patients are treated with ipsilateral and bilateral irradiation, but there is no significant difference in overall survival.
authors: Department of Radiation Oncology, Second Affiliated Hospital of Soochow University, Suzhou, China. luxueguanok@yahoo.com.cn
authors: Xueguan
authors: X
authors: Lu
authors: Chaosu
authors: C
authors: Hu
authors: Qinghai
authors: Q
authors: Ji
authors: Chunying
authors: C
authors: Shen
authors: Yan
authors: Y
authors: Feng
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy* / Q000556:secondary*; D017024:Chemotherapy, Adjuvant; D005260:Female; D006258:Head and Neck Neoplasms / Q000473:pathology* / Q000532:radiotherapy*; D006801:Humans; D053208:Kaplan-Meier Estimate; D008198:Lymph Nodes / Q000473:pathology* / Q000528:radiation effects*; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009333:Neck; D037981:Neck Dissection; D009367:Neoplasm Staging; D009382:Neoplasms, Unknown Primary / Q000473:pathology* / Q000532:radiotherapy*; D011379:Prognosis; D011878:Radiotherapy / Q000379:methods