This is the Accepted Version of the following article: Immunohistochemically Detected Expression of ATRX, TSC2, and PTEN Predicts Clinical Outcomes in Patients With Grade 1 and 2 Pancreatic Neuroendocrine Tumors; Annals of surgery; Volume Publish Ahead of Print (Octover 9, 2019 ) doi: 10.1097/SLA.0000000000003624, which has been published in final form at https://doi.org/10.1097/SLA.0000000000003624.