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Article History

Received: 28 March 2024

Accepted: 8 December 2024

First Online: 2 January 2025

Declarations

:

: The study was approved by the ethics committee of the University Hospital of Cologne (number 20-1108).

: According to §10 section (9) of the German Data Protection Act (DSG), the storage or use of personal (in this case patient-related) data is permissible if it is necessary for the conduct of scientific research and the scientific interest in carrying out the research project substantially outweighs the interest of the individual concerned, as well as the research purpose cannot be achieved in any other way or can only be achieved at disproportionate expense. Since this retrospective study only includes patients recurrent head and neck cancer who were treated until July 2018, it can be assumed that, given the poor prognosis or short survival time of the patients, it will not be possible to subsequently obtain the consent of the patients for the study-related analysis of their data, or only at disproportionate expense. In contrast, the research topic offers the possibility to evaluate the Optimization of (Re-)Irradiation for Locally Recurrent Head and Neck Cancer and their prognostic significance, which may provide important information for subsequent and individualized therapeutic options for the patients. Only patient data that were available by 31 December 2019 will be collected, so there will be no direct or indirect cost or harm to patients. The data to be analysed in this study is retrospective data only and has been collected and analysed anonymously. Prospective.data sets have not been collected.

: Not applicable.

: The authors declare no competing interests.