title: The expression of NeuroD and mASH1 in the gastroenteropancreatic neuroendocrine tumors.
abstract: Gastroenteropancreatic neuroendocrine tumors are uncommon and their tumor biology has not been well elucidated to date. Currently the WHO classification is widely used for the diagnosis and distinction of this tumor entity, which is sometimes cumbersome. Although neuroendocrine tumor markers do exist (ie chromograninA, synaptopyhsin, etc), sensitive and specific markers that accurately predict tumor growth and tumor behavior are still absent. In the present study, we assessed the expression of transcription factors (NeuroD and mASH1) essential for the normal fetal neuronal development in 33 gastroenteropancreatic neuroendocrine tumor patients (12 well-differentiated neuroendocrine tumors, 7 well-differentiated neuroendocrine carcinomas, and 14 poorly differentiated neuroendocrine carcinomas). NeuroD was less expressed in poorly differentiated neuroendocrine carcinoma (small-cell type) compared to well-differentiated neuroendocrine tumor (carcinoid) by reverse transcription-polymerase chain reaction. Immunohistochemical staining revealed that mASH1 was highly (sensitivity of 71%) and specifically (specificity of 95%) expressed in poorly differentiated neuroendocrine carcinoma. High NeuroD expression was seen in all well-differentiated neuroendocrine carcinoma and tumor (carcinoid) patients. Low NeuroD expression was seen in 36% (5 of 14) of poorly differentiated neuroendocrine carcinoma patients, which was associated with significant shorter overall survival. The expression pattern of these transcription factors may represent the biological and pathophysiological difference of gastroenteropancreatic neuroendocrine tumors and may become a new marker for the distinction of gastroenteropancreatic neuroendocrine tumors.
authors.affiliation: Department of General Surgery, Chiba University Graduate School of Medicine, Chiba, Japan. shidax812@yahoo.co.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Shida
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Furuya
authors.forename: Takashi
authors.initials: T
authors.lastname: Kishimoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Nikaido
authors.forename: Tohru
authors.initials: T
authors.lastname: Tanizawa
authors.forename: Keiji
authors.initials: K
authors.lastname: Koda
authors.forename: Kenji
authors.initials: K
authors.lastname: Oda
authors.forename: Shigetsugu
authors.initials: S
authors.lastname: Takano
authors.forename: Fumio
authors.initials: F
authors.lastname: Kimura
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Shimizu
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yoshidome
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ohtsuka
authors.forename: Yukio
authors.initials: Y
authors.lastname: Nakatani
authors.forename: Masaru
authors.initials: M
authors.lastname: Miyazaki
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism*; D003131:Combined Modality Therapy; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000401:mortality; D015870:Gene Expression; D006801:Humans; D008297:Male; D008875:Middle Aged; D018358:Neuroendocrine Tumors / Q000235:genetics / Q000378:metabolism* / Q000401:mortality; D010190:Pancreatic Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000401:mortality; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015996:Survival Rate; D055815:Young Adult
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D014408:Biomarkers, Tumor; D012333:RNA, Messenger; C065500:ASCL1 protein, human; C093970:NEUROD1 protein, human