Evaluation of interobserver and interscale agreement in assessing late bowel toxicity after pelvic radiation in patients with carcinoma of the cervix.

Background: Lack of agreement and inconsistency in capturing late bowel toxicity may be a source of error while reporting trials with toxicity endpoints. Documenting baseline inconsistency while scoring toxicity questionnaires (RTOG/EORTC and CTCAE) may be worthwhile. The present study was conducted as a quality assurance measure prior to initiating a randomized trial (PARCER; NCT01279135) that evaluates the impact of image-guided radiation on bowel toxicity.