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Radiotherapy for benign achillodynia

Long-term results of the Erlangen Dose Optimization Trial

Strahlentherapie bei Achillodynie

Langzeitergebnisse der Erlanger Dosisoptimierungsstudie

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Abstract

Background

The aim of this study was to evaluate the long-term efficacy of two dose-fractionation schedules for radiotherapy of achillodynia.

Patients and methods

Between February 2006 and February 2010, 112 evaluable patients were recruited for this prospective trial. All patients received orthovoltage radiotherapy. One course consisted of 6 fractions/3 weeks. In the case of insufficient remission of pain after 6 weeks, a second series was performed. Patients were randomly assigned to receive either single doses of 0.5 or 1.0 Gy. The endpoint was pain reduction. Pain was measured before, right after (early response), 6 weeks after (delayed response), and approximately 2 years after radiotherapy (long-term response) with a questionnaire-based visual analogue scale (VAS) and a comprehensive pain score (CPS).

Results

The median follow-up was 24 months (range, 11–56). The overall early, delayed, and long-term response rates for all patients were 84 %, 88 %, and 95 %, respectively. The mean VAS values before treatment for early, delayed, and long-term responses for the 0.5-Gy and 1.0-Gy groups were 55.7 ± 21.0 and 58.2 ± 23.5 (p = 0.53), 38.0 ± 23.2 and 30.4 ± 22.6 (p = 0.08), 35.5 ± 25.9 and 30.9 ± 25.4 (p = 0.52), and 11.2 ± 16.4 and 15.3 ± 18.9 (p = 0.16), respectively. The mean CPS values before treatment for early, delayed, and long-term responses were 8.2 ± 3.0 and 8.9 ± 3.3 (p = 0.24), 5.6 ± 3.1 and 5.4 ± 3.3 (p = 0.76), 4.4 ± 2.6 and 5.3 ± 3.8 (p = 0.58), and 2.2 ± 2.9 and 2.8 ± 3.3 (p = 0.51), respectively. No significant differences in long-term response quality between the two arms was found (p = 0.73).

Conclusion

Radiotherapy is a very effective treatment for the management of benign achillodynia. For radiation protection, the dose for a radiotherapy series should not exceed 3.0 Gy.

Zusammenfassung

Hintergrund

Ziel war die Untersuchung der Langzeiteffektivität zweier Dosisfraktionierungskonzepte bei der Strahlentherapie von Patienten mit Achillodynie.

Material und Methode

Zwischen 2006 und 2010 wurden 112 auswertbare Patienten in diese prospektive und randomisierte Phase-IV-Studie eingeschlossen. Alle Patienten erhielten die Bestrahlung in Orthovolt-Technik. Eine Bestrahlungsserie bestand aus 6 Fraktionen/3 Wochen. Bei ungenügendem Ansprechen der Schmerzsymptomatik nach 6 Wochen wurde eine zweite Bestrahlungsserie durchgeführt. Die Patienten wurden auf die beiden Studienarme randomisiert verteilt und erhielten je nach Ergebnis Einzeldosen von 0,5 bzw. 1,0 Gy. Der Endpunkt der vorliegenden Analyse war die Schmerzreduktion. Die Schmerzintensität wurde vor, nach („early response“), 6 Wochen nach („delayed response“) sowie etwa 3 Jahre nach der Strahlentherapie („long-term response“) mittels Visueller Analogskala (VAS) und einem umfassenden Schmerzscore (CPS) gemessen.

Ergebnisse

Die mediane Nachbeobachtungszeit für die Langzeitevaluation betrug 24 (11–56) Monate. Die Raten für das frühe, verzögerte und Langzeitansprechen aller Patienten betrugen 84, 88 und 95 %. Die mittleren VAS-Werte vor Behandlung, für das frühe, verzögerte und Langzeitansprechen lagen für die Gruppe mit 0,5 und 1,0 Gy bei 55,7 ± 21,0 und 58,2 ± 23,5 (p = 0,53), 38,0 ± 23,2 und 30,4 ± 22,6 (p = 0,08), 35,5 ± 25,9 und 30,9 ± 25,4 (p = 0,52) sowie 11,2 ± 16,4 und 15,3 ± 18,9 (p = 0,16). Die entsprechenden mittleren Werte im Schmerzscore betrugen 8,2 ± 3,0 und 8,9 ± 3,3 (p = 0,24), 5,6 ± 3,1 und 5,4 ± 3,3 (p = 0,76), 4,4 ± 2,6 und 5,3 ± 3,8 (p = 0,58) sowie 2,2 ± 2,9 und 2,8 ± 3,3 (p = 0,51). Es wurden keinerlei statistisch signifikante Unterschiede in der Qualität des Langzeitansprechens zwischen den beiden Studienarmen festgestellt (p = 0,73).

Schlussfolgerung

Die Strahlentherapie ist langfristig eine sehr effektive Maßnahme zur Behandlung der Achillodynie. Aus Strahlenschutzgründen sollte eine Gesamtdosis von 3 Gy pro Bestrahlungsserie nicht überschritten werden.

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Acknowledgments

This work was supported in part by the German Federal Ministry of Education and Research (GREWIS, 02NUK017G), and the European Commission (DoReMi, European Network of Excellence, contract number 249689).

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Correspondence to Oliver J. Ott.

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Conflict of interest

O.J. Ott, C. Jeremias, U.S. Gaipl, B. Frey, M. Schmidt, and R. Fietkau state that there are no conflicts of interest.

All studies on humans described in the present manuscript were carried out in accordance with national law and the Helsinki Declaration of 1975 (in its current, revised form). Informed consent was obtained from all patients included in studies.

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Ott, O., Jeremias, C., Gaipl, U. et al. Radiotherapy for benign achillodynia. Strahlenther Onkol 191, 979–984 (2015). https://doi.org/10.1007/s00066-015-0893-4

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