TP53 and Barrett esophagus: To determine whether the timing of the biopsy in relation to the patient’s surveillance history may affect the results, we separated the results into the patients with p53 IHC information on their first index endoscopy (first ever diagnosis of BE), patients where the first p53 IHC was on a surveillance endoscopy for NDBE (no known BE-IND or BE-LGD), or patients with BE-LGD when the first p53 IHC was on a surveillance endoscopy after a diagnosis of BE-LGD.