title: [The prognostic value of time parameters in adjuvant radiotherapy of head and neck cancer. A retrospective analysis of 138 patients].
abstract: OBJECTIVE
  To answer the question, how the parameters waiting time, radiation treatment time and overall treatment time (OTT) influenced the endpoints overall (OS), event-free (EFS) and local recurrence-free survival (LRFS) in patients with locally advanced head-and-neck cancer, who had received postoperative radiotherapy.
  
  
  METHODS
  138 patients were included into a retrospective analysis from 10/1993 to 05/2000. Besides the time parameters waiting time, radiation treatment time and OTT, tumor- and therapy-related parameters (T-, N-, R-status, grading, tumor site, surgical technique, and postoperative hemoglobin < 12 g/dl) with potential impact on the endpoints were investigated in the univariate analysis (Kaplan-Meier log-rank test). Individual parameters with a significant impact (p = 0.05) were subjected to a multivariate Cox regression analysis.
  
  
  RESULTS
  Besides a postoperative hemoglobin value < 12 g/dl, in the univariate analysis an OTT >/= 105 days negatively influenced all endpoints, as well as a radiation treatment time >/= 60 days. On multivariate Cox regression analysis, postoperative hemoglobin < 12 g/dl and an OTT >/= 105 days were identified as independent negative prognostic factors for all endpoints.
  
  
  CONCLUSIONS
  The waiting time should be managed according to the ASARA (as short as reasonably achievable) recommendation, radiation treatment should not be protracted exceeding an overall treatment of 105 days. Generally, time parameters should be routinely included in the standard tumor documentation, thus facilitating further evaluation of these prognostically relevant factors.
authors.affiliation: Klinik für Strahlentherapie, Universitätsklinikum Regensburg, Franz-Josef-Strauss-Allee 11, 93053, Regensburg. barbara.dietl@klinik.uni-regensburg.de
authors.forename: Barbara
authors.initials: B
authors.lastname: Dietl
authors.forename: Christof
authors.initials: C
authors.lastname: Schäfer
authors.forename: Oliver
authors.initials: O
authors.lastname: Kölbl
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005858:Germany / Q000453:epidemiology; D006258:Head and Neck Neoplasms / Q000401:mortality* / Q000532:radiotherapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D018714:Radiotherapy, Adjuvant / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D016019:Survival Analysis; D015996:Survival Rate; D013997:Time Factors; D016896:Treatment Outcome; D014850:Waiting Lists