HER‐2/neu Expression in Pancreatic AdenocarcinomaRelation to Tumor Differentiation and Survival
作者:
Michael Dugan,
Sanaa Dergham,
Roger Kucway,
Kanwal Singh,
Laura Biernat,
Wei Du,
Vainutis Vaitkevicius,
John Crissman,
Fazlul Sarkar,
期刊:
Pancreas
(OVID Available online 1997)
卷期:
Volume 14,
issue 3
页码: 229-236
ISSN:0885-3177
年代: 1997
出版商: OVID
关键词: Pancreatic cancer;HER-2/neu;Tumor grade;Ductal adenocarcinoma;Differentiation;Survival
数据来源: OVID
摘要:
HER-2/neu expression in pancreatic adenocarcinoma has been inconsistently reported and has not been fully evaluated with respect to histologic grade and tumor grade heterogeneity. We studied HER-2/neu expression in a series of 79 primary pancreatic carcinomas using immunohistochemical methods, with expression scored for each histologic grade represented in each tumor. We found significantly lower expression of HER-2/neu in poorly differentiated (PD) portions of tumors—those areas lacking glandular differentiation—compared to well-differentiated (WD) and moderately differentiated (MD) portions of tumors. Forty-two of 68 (62%) invasive tumors with WD or MD glands showed moderate or strong expression of HER-2/neu in WD/MD areas; only 6 of 32 (19%) invasive tumors with PD areas showed similar expression in PD. In mutually exclusive patient sets, we also found a statistically different prevalence of HER-2/neu expression in patients with PD (6/32 cases; 19%) and without PD (29/47 cases; 62%) tumors (p< 0.001). Twenty-three cases had directly comparable areas of PD versus MD or WD. In 19 of 23 cases HER-2/neu expression was graded comparatively lower (or negative) in areas of PD than in MD or WD. Overall 46 of 79 cases (58%) showed moderate to strong HER-2/neu expression inclusive of all histologic grades, and 63 of 79 (80%) cases were HER-2/neu positive, if including weak or focal staining. There was no significant difference in the survival of patients with HER-2/neu-positive versus-negative tumors or in patients with versus without PD tumors. We have confirmed that although HER-2/neu gene expression is common to many pancreatic carcinomas, it is not common to tumors lacking glandular differentiation. HER-2/neu gene expression could not be related to survival differences—perhaps due to overall poor survival within adenocarcinomas of the pancreas—but the pattern of HER-2/neu expression suggests a relationship to glandular differentiation and early oncogenesis.
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