Text and Data Mining valid from 2020-02-12
Received: 17 March 2019
Accepted: 16 January 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: This retrospective study was approved by the multi-institutional review board of the French Sarcoma Clinical Reference Network NETSARC (website:ExternalRef removed). Institutional ethics committee approval was also obtained by the two Principal Investigator centres (IRFC, Besançon, France for LC and Centre François Leclerc, Dijon, France for IN). Written informed consent was obtained from all alive study subjects. The study was performed in accordance with the Declaration of Helsinki.
: Not applicable
: The authors declare that they have no competing interests.