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Aktuelle Überlegungen zur System- und Lokaltherapie beim Ewing-Sarkom

Current considerations regarding systemic and local therapy of Ewing’s sarcoma

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Die Onkologie Aims and scope

Zusammenfassung

Hintergrund

Das Ewing-Sarkom (EWS) ist ein bösartiger Tumor des Knochen- und Weichteilgewebes. Bereits bei der Diagnosestellung weisen 25 % der Patienten Fernmetastasen auf. Die multimodale Therapie setzt sich aus einer chemotherapeutischen Induktionsphase mit darauffolgender chirurgischer und/oder radiotherapeutischer Lokaltherapie und einer anschließenden adjuvanten Chemotherapie zusammen.

Ergebnisse

Bei lokoregionärer Erkrankung wird derzeit eine Kombinationschemotherapie, bestehend aus den Substanzen Ifosfamid, Cyclophosphamid, Doxorubicin, Etoposid, Actinomycin D und Vincristin, als Standard angesehen. Bei ungünstigem histologischen Ansprechen auf eine konventionell dosierte Chemotherapie wird eine hochdosierte Chemotherapie mit Busulfan und Melphalan in Verbindung mit einer Stammzelltransplantation eingesetzt. Die Planung der Lokaltherapie ist geprägt von der Möglichkeit einer makroskopisch vollständigen, En-bloc-Resektion mit tumorfreien Resektionsrändern und der perioperativen Morbidität. Aktuell wird oftmals eine Kombination aus Operation und Bestrahlung der Tumorregion favorisiert. Dabei erfolgt die Bestrahlung unter Einsatz hochkonformaler Techniken, wie z. B. der Protonentherapie, die heute bereits breiter verfügbar ist und mit der vielversprechende Ergebnisse bei der Behandlung des EWS erreicht werden konnten. Im Fall einer Metastasierung kann eine konsequente Lokaltherapie die Behandlungsergebnisse verbessern.

Abstract

Background

Ewing’s sarcoma (EWS) is a malignant tumor of bone and soft tissue. At diagnosis, 25% of patients already present with distant metastases. Multimodal therapy comprises induction chemotherapy, followed by surgical and/or radiotherapeutic local therapy and subsequent adjuvant chemotherapy.

Results

For locoregional disease, combination chemotherapy consisting of ifosfamide, cyclophosphamide, doxorubicin, etoposide, actinomycin D, and vincristine is currently considered standard. In poor responders to induction chemotherapy, high-dose chemotherapy (i.e. with busulfan and melphalan) with stem cell transplantation is given. Local therapy is guided by the ability of a complete, en bloc resection with tumor-free resection margins with acceptable perioperative morbidity. Currently, a combination of surgery and irradiation of the tumor region, including tissue possibly contaminated by the initial biopsy, is often performed. Radiotherapy is delivered using highly conformal techniques, such as proton beam therapy, which is now more widely available and has achieved promising results in the treatment of EWS. In case of metastases at diagnosis, local therapy of distant sites can improve the treatment results.

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Correspondence to Beate Timmermann.

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B. Timmermann, D. Andreou und U. Dirksen geben an, dass kein Interessenkonflikt besteht.

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Timmermann, B., Andreou, D. & Dirksen, U. Aktuelle Überlegungen zur System- und Lokaltherapie beim Ewing-Sarkom. Onkologie 28, 563–571 (2022). https://doi.org/10.1007/s00761-022-01128-5

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