Consensus Document on the Progression and Treatment Response Criteria in Gastroenteropancreatic Neuroendocrine Tumours

This is a clinical practice guideline that aims to support clinicians in the evaluation of gastroenteropancreatic neuroendocrine tumour (GEP-NET) progression and treatment response. Topics of discussion include morphological imaging, molecular imaging, and pseudoprogression. Recommendations are provided pertaining to the imaging tools and optimal techniques that should used for monitoring patients and evaluating treatment response. Recommendations are also provided for the surveillance of patients with metastatic GEP-NETs, including the appropriate frequency of follow-up.