Pyloric gland adenoma arising in Barrett's esophagus with mucin immunohistochemical and molecular cytogenetic evaluation.
Pyloric gland adenoma is a recently described and very rare entity. The occurrence of adenoma is very unusual in Barrett's epithelium of the esophagus. We report a case of esophageal polyp showing the features of pyloric gland adenoma, which was surrounded by so-called specialized columnar epithelium. Immunohistochemically, most tumor glands were strongly positive for MUC6, except in the superficial layer. MUC5AC was positive in almost all tumor cells, but MUC2 and CD10 were negative in the tumor. MIB-1-positive proliferating cells were distributed throughout the tumor. Microdissection and comparative genomic hybridization analyses revealed losses on 2p24-25.2, 2q14.1-ter, 5q31.3-32, 6q23-24, 8q23-24.2, 11q22.3-24 and 18q21.1-22. This is the first case of pyloric gland adenoma found to arise in Barrett's epithelium of the esophagus, showing its unstable and precancerous nature.
Kushima
Ryoji
R
Division of Diagnostic Pathology, Shiga University of Medical Science, Seta, Otsu, 520-2192 Shiga, Japan. kushima@belle.shiga-med.ac.jp
Vieth
Michael
M
Mukaisho
Ken-Ichi
K
Sakai
Rie
R
Okabe
Hidetoshi
H
Hattori
Takanori
T
Neuhaus
Horst
H
Borchard
Franz
F
Stolte
Manfred
M
D000236:Adenoma / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D001471:Barrett Esophagus / Q000473:pathology*; D020732:Cytogenetic Analysis; D005753:Gastric Mucosa; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis; D008297:Male; D008875:Middle Aged; D055271:Mucin 5AC; D055272:Mucin-6; D009077:Mucins / Q000032:analysis*; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology
D019394:Ki-67 Antigen; C524678:MUC5AC protein, human; C524734:MUC6 protein, human; D055271:Mucin 5AC; D055272:Mucin-6; D009077:Mucins