The BCB SARCOMES database is a clinical and biological national database dedicated to sarcoma that contains 3 main databases with specific aims: the first is the pathology database (French expert network dedicated to the management of bone sarcomas \[RESOS\] / French expert network dedicated to the pathology of sarcomas \[RREPS\]), dedicated to systematic review of mesenchymal tumor diagnostics nationwide; the second is clinical (RESOS / French expert clinical network for sarcomas \[NETSARC\]), collecting multidisciplinary tumor boards (MDTB) data of patients nationwide, and the third (CONTICABASE / BONE / GIST) is dedicated to collecting patients longitudinal/follow up data, with a focus on treatments of every events, and a catalogue of associated samples. Primary objectives of BCB-SARCOMES are the following: description of the patterns of care and treatment outcomes, assessment of the prognostic factors of patients' outcomes. With the financial support of the French National Cancer Institute \[Institut National du cancer \[INCa\]).