title: [Long-term experiences in the therapy of esthesioneuroblastoma].
abstract: BACKGROUND
  Esthesioneuroblastoma is a rare and clinically variable tumor of nasal sinus and skull base and challenging for modern multidisciplinary therapy. There are no generally known prognostic factors or generally accepted standard therapy regimens.
  
  
  METHODS
  Between 1975 and 2001 26 patients were treated after the diagnosis of esthesioneuroblastoma was established. The cases were evaluated retrospectively. According to the classification of Kadish 1 patient (4 %) had stage A, 16 patients (53 %) stage B and 11 cases (43 %) had stage C tumors. Hyams grading could be obtained in 22 cases (81 %). Tumors were in 12 patients (52 %) graded I or II and in 10 cases tumors had grade III or IV (48 %). Operative therapy was performed in 23 patients (88.5 %), being in 5 patients a single mode therapy. In 18 cases combined therapy was performed (surgery and radiotherapy or radiotherapy and chemotherapy).
  
  
  RESULTS
  Actuarial survival was 61.5 % (16/26). Disease specific 10- and 15-year-survival according to the estimation of Kaplan-Meier was 76.2 %. Patients with small tumors (Kadish A/B) had a 15-year-survival of 86.7 % compared to 63.6 % in cases with advanced tumors (Kadish C). In 7 cases (26.9 %) recurrences developed. Salvage therapy was performed in 5 cases (71.4 %) with a success rate and a 15-year survival each of 60 %.
  
  
  CONCLUSIONS
  Therapy of esthesioneuroblastoma is challenging because of rarity and biologic variability of the tumor and and because of lack of a standard therapy. An interdisciplinary multimodal therapeutic approach is necessary especially in case of advanced tumors with promising results. Histopathological grading according to Hyams and tumor stage are important factors for survival and prognosis. Although recurrence can occur with high frequency even after prolonged time interval, long time survival can be improved after aggressive salvage therapy. Therefore longterm follow up is mandatory.
authors: Klinik für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstrasse 1, 91054 Erlangen. michael.koch@hno.imed-uni-erlangen.de
authors: M
authors: M
authors: Koch
authors: J
authors: J
authors: Constantinidis
authors: A
authors: A
authors: Dimmler
authors: C
authors: C
authors: Strauss
authors: H
authors: H
authors: Iro