1426passociation between Risk of Recurrence Assessment and Adjuvant Treatment (tx) Duration in Patients (pts) with Resected Gastrointestinal Stromal Tumors (gists).

Methods: A physician-administered, chart extraction tool was developed to collect information on adult pts with primary resectable KIT+ GIST. Pt clinical characteristics, planned adjuvant tx duration, and physician charted risk assessment was collected on 506 pts. The risk of recurrence was 1) reported based on physicians’ subjective assessment and 2) calculated based on the revised NIH criteria using pts’ primary tumor characteristics. Physician risk assessment and calculated risk were compared to classify pts into 2 risk cohorts: underestimated and not underestimated. Exact Fisher tests were used to compare the planned adjuvant tx duration between the underestimated and not underestimated cohorts.