Gastrointestinal Stromal Tumors

Post-authorisation, multicentric, observational, retrospective and prospective study to assess quality of care of sarcoma patients in expert and non-expert centers by analysing correlation of quality items and outcomes such as relapse free survival, overall survival, percentage of amputation, etc. Expert pathology peer review will be performed to detect differences between expert and non-expert centers as well as differences in treatment and patient prognosis. Tumor samples of 4 types of sarcoma would also be included in translational research to detect biomarkers and produce preclinical models.