title: Outcome of treatment with total main tumor resection and supraomohyoid neck dissection in oral squamous cell carcinoma.
abstract: OBJECTIVE
  Supraomohyoid neck dissection (SOHND) is commonly used to treat oral squamous cell carcinoma (OSCC) patients with clinical N0 or selected N1 status. The purpose of this study was to evaluate the clinical outcome of OSCC patients treated with SOHND.
  
  
  METHODS
  This retrospective study reviewed the clinical outcome of 257 patients (247 men, 10 women) with N0, N1 and N2a OSCC treated with wide excision of the main tumor and SOHND between 1992 and 1999. All patients were followed up for at least 5 years. Survival distributions were analyzed using Kaplan-Meier curves. N status was compared using chi2 and log rank tests.
  
  
  RESULTS
  The neck failure rate was 20% for clinically false negative cases, 6.1% for clinically true negative cases, 21.8% for clinically false positive cases, and 40% for clinically true positive cases. The 3- and 5-year overall neck disease-free survival rates were 79.8% and 77.6%, respectively. The 3- and 5-year neck disease-free survival rates were 86.7% and 84.2% for pathologic N0 cases, 56.9% and 56.9% for pathologic N1 cases, and 27.5% and 27.5% for pathologic N2 cases, respectively. Log rank test showed that the p value for difference in survival at 3-5 years was 0.064 for pathologic N0 vs. N1 cases, < 0.0001 for pathologic N0 vs. N2 cases, and 0.008 for pathologic N1 vs. N2 cases.
  
  
  CONCLUSIONS
  This study showed that SOHND is effective for pathologic N0 OSCC, relatively effective for pathologic N1, and less effective for pathologic N2a. These findings also support that when SOHND is used to treat N2a OSCC, postoperative radiotherapy or radical neck dissection may be needed to improve the neck disease-free survival rate.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Chi-Mei Hospital, Liouying, Tainan, Taiwan.
authors.forename: Gwo-An
authors.initials: GA
authors.lastname: Liaw
authors.forename: Ching-Yu
authors.initials: CY
authors.lastname: Yen
authors.forename: Wei-Fan
authors.initials: WF
authors.lastname: Chiang
authors.forename: Chin-Hai
authors.initials: CH
authors.lastname: Lee
authors.forename: Cheng
authors.initials: C
authors.lastname: Yang
authors.forename: Chang-Ta
authors.initials: CT
authors.lastname: Chiou
authors.forename: Shyun-Yeu
authors.initials: SY
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000401:mortality / Q000601:surgery*; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000401:mortality / Q000601:surgery*; D037981:Neck Dissection / Q000379:methods*; D012189:Retrospective Studies; D015996:Survival Rate; D013624:Taiwan / Q000453:epidemiology