Adjuvant GIST Trial

This clinical trial is studying Adjuvant GIST Trial. It is looking for adults who may be eligible to participate. Participants may need to meet certain health requirements, including: histologically proven diagnosis of GIST (positive for CD117), intermediate or high risk of relapse documented on surgical specimen, surgery performed between 2 weeks and 3 months before treatment start , non evidence of residual macroscopic disease after surgery (R0 or R1 resection only), no prior treatment for GIST (ie. radiotherapy, chemotherapy, molecular targeted therapy, biological therapy), absence of distant metastases, WHO performance status 0.