title: Loss of Hes1 Differentiates Sessile Serrated Adenoma/Polyp From Hyperplastic Polyp.
abstract: Sessile serrated adenoma/polyp (SSA/p) is a precancerous lesion, and its differential diagnosis from hyperplastic polyp (HP) could be challenging in certain circumstances based on morphology alone. Hes1 is a downstream target of Notch-signaling pathway and plays an important role in intestinal development by regulating differentiation of enterocytes. In this study, we evaluated the expression patterns of Hes1 in SSA/p and HP, and determine whether Hes1 immunostaining can help differentiate between these 2 entities. Serrated polyps with cytologic dysplasia (SSA with cytologic dysplasia, tubular adenoma, and traditional serrated adenoma) were also studied. Hes1 is ubiquitously expressed in the nuclei of normal colon epithelial cells. The complete loss or a very weak expression of Hes1 is observed in the majority of the SSA/p in the study (58/63, 92%) compared with the normal expression of Hes1 in HP (35/35,100%). In SSA/p with cytologic dysplasia, dysplastic area demonstrated cytoplasmic and/or nuclear staining for Hes1. Tubular adenoma and traditional serrated adenoma showed variability of Hes1 staining within the polyp with a mixed positive and negative staining pattern. Our study suggests that loss of Hes1 could be used as a sensitive and specific marker to differentiate SSA/p from HP, which helps the diagnosis in morphologically challenging cases.
authors.affiliation: *Department of Pathology, University Hospitals Case Medical Center †Department of Pathology, Case Western Reserve University, Cleveland, OH.
authors.forename: Min
authors.initials: M
authors.lastname: Cui
authors.forename: Amad
authors.initials: A
authors.lastname: Awadallah
authors.forename: Wendy
authors.initials: W
authors.lastname: Liu
authors.forename: Lan
authors.initials: L
authors.lastname: Zhou
authors.forename: Wei
authors.initials: W
authors.lastname: Xin
mesh_terms: D018256:Adenomatous Polyps / Q000737:chemistry* / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D051792:Basic Helix-Loop-Helix Proteins / Q000032:analysis*; D014408:Biomarkers, Tumor / Q000032:analysis*; D003110:Colonic Neoplasms / Q000737:chemistry* / Q000473:pathology; D003111:Colonic Polyps / Q000737:chemistry* / Q000473:pathology; D003937:Diagnosis, Differential; D015536:Down-Regulation; D005260:Female; D018398:Homeodomain Proteins / Q000032:analysis*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011379:Prognosis; D000072056:Transcription Factor HES-1
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D014408:Biomarkers, Tumor; D018398:Homeodomain Proteins; D000072056:Transcription Factor HES-1; C078493:HES1 protein, human