title: Clinical outcomes for T1-2N0-1 oral tongue cancer patients underwent surgery with and without postoperative radiotherapy.
abstract: BACKGROUND
  The aim of this study was to assess the results of curative surgery with and without radiotherapy in patients with T1-2N0-1 oral tongue squamous cell carcinoma (OSCC) and to evaluate survival and prognostic factors.
  
  
  METHODS
  Retrospective analysis of 86 patients with T1-2N0-1 OSCC who received surgery between January 2000 and December 2006. Fourteen patients (16.3%) received postoperative radiotherapy (PORT). Patient characteristics, tumor characteristics, treatment modality, failure patterns, and survival rates were analyzed.
  
  
  RESULTS
  The median follow-up was 45 months. The five-year overall survival (OS) and disease-free survival (DFS) rates were 80.8% and 80.2%, respectively. Higher tumor grade and invasion depth > or = 0.5 cm were the significant prognostic factors affecting five-year OS and DFS (OS rate; 65% vs. 91%, p = 0.001 for grade; 66% vs. 92%, p = 0.01 for invasion depth: DFS rate; 69% vs. 88%, p = 0.005 for grade; 66% vs. 92%, p = 0.013 for invasion depth). In the risk group, there was no local failure in patients with postoperative radiotherapy.
  
  
  CONCLUSIONS
  In T1-2N0-1 OSCC, factors that affected prognosis after primary surgery were higher tumor grade and deep invasion depth over 0.5 cm. Postoperative radiotherapy should be considered in early oral tongue cancer patients with these high-risk pathologic features.
authors.affiliation: Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University Health System, Seoul, Korea.
authors.forename: Su Jung
authors.initials: SJ
authors.lastname: Shim
authors.forename: Jihye
authors.initials: J
authors.lastname: Cha
authors.forename: Woong Sub
authors.initials: WS
authors.lastname: Koom
authors.forename: Gwi Eon
authors.initials: GE
authors.lastname: Kim
authors.forename: Chang Geol
authors.initials: CG
authors.lastname: Lee
authors.forename: Eun Chang
authors.initials: EC
authors.lastname: Choi
authors.forename: Ki Chang
authors.initials: KC
authors.lastname: Keum
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery*; D003131:Combined Modality Therapy; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate; D014062:Tongue Neoplasms / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery*; D016896:Treatment Outcome; D055815:Young Adult