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Pancreatic Neoplasms: HELP
Articles by Stephen W. Scherer
Based on 2 articles published since 2010
(Why 2 articles?)
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Between 2010 and 2020, Stephen W. Scherer wrote the following 2 articles about Pancreatic Neoplasms.
 
+ Citations + Abstracts
1 Article Molecular characteristics of a pancreatic adenocarcinoma associated with Shwachman-Diamond syndrome. 2013

Dhanraj, Santhosh / Manji, Arif / Pinto, Dalila / Scherer, Stephen W / Favre, Helen / Loh, Mignon L / Chetty, Runjan / Wei, Alice C / Dror, Yigal. ·Cell Biology Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada. ·Pediatr Blood Cancer · Pubmed #23303473.

ABSTRACT: BACKGROUND: Shwachman-Diamond syndrome (SDS) is characterized by hypoplasia of the bone marrow and exocrine pancreas and a high risk of leukemia. It is unknown whether solid tumors are part of the disease phenotype. PROCEDURE: We performed copy number alterations using Affymetrix human SNP 6.0 array. Furthermore, we did direct sequencing of pancreatic cancer-related genes and immunohistochemical expression of selective proteins. RESULTS: Among 41 patients with SDS who enrolled on the registry, we identified one male patient with a solid tumor: moderately differentiated pancreatic ductal adenocarcinoma. The tumor harbored 41 copy number alterations (CNAs) and had no regions of loss of heterozygosity (LOH). None of these CNAs were exclusive to the tumor. One copy of the tumor suppressor genes CTNNA3 and LGALS9C was lost in both the peripheral blood and tumor. Direct sequencing of TP53, KRAS, and NRAS revealed no mutations. Immunohistochemical staining for cyclin D1, E-cadherin, p53 MLH1 and MSH2 and β-catenin, was similar to that seen in non-hereditary pancreatic cancer. CONCLUSIONS: Our case raises the possibility that solid tumors are associated with SDS, thereby broadening the clinical phenotype of the disease. The relatively young age at cancer diagnosis and the specific involvement of the pancreas make the possibility of an association with SDS likely. Similar to leukemia in SDS, the pancreatic cancer developed in hypoplastic tissues. This observation and the relative genomic stability of the tumor strengthen the hypothesis of improved adaptation of malignant clones among a population of disadvantaged cells as a mechanism for tumor expansion in SDS.

2 Article Identification of germline genomic copy number variation in familial pancreatic cancer. 2012

Al-Sukhni, Wigdan / Joe, Sarah / Lionel, Anath C / Zwingerman, Nora / Zogopoulos, George / Marshall, Christian R / Borgida, Ayelet / Holter, Spring / Gropper, Aaron / Moore, Sara / Bondy, Melissa / Klein, Alison P / Petersen, Gloria M / Rabe, Kari G / Schwartz, Ann G / Syngal, Sapna / Scherer, Stephen W / Gallinger, Steven. ·Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada. wigdan.al.sukhni@utoronto.ca ·Hum Genet · Pubmed #22665139.

ABSTRACT: Adenocarcinoma of the pancreas is a significant cause of cancer mortality, and up to 10 % of cases appear to be familial. Heritable genomic copy number variants (CNVs) can modulate gene expression and predispose to disease. Here, we identify candidate predisposition genes for familial pancreatic cancer (FPC) by analyzing germline losses or gains present in one or more high-risk patients and absent in a large control group. A total of 120 FPC cases and 1,194 controls were genotyped on the Affymetrix 500K array, and 36 cases and 2,357 controls were genotyped on the Affymetrix 6.0 array. Detection of CNVs was performed by multiple computational algorithms and partially validated by quantitative PCR. We found no significant difference in the germline CNV profiles of cases and controls. A total of 93 non-redundant FPC-specific CNVs (53 losses and 40 gains) were identified in 50 cases, each CNV present in a single individual. FPC-specific CNVs overlapped the coding region of 88 RefSeq genes. Several of these genes have been reported to be differentially expressed and/or affected by copy number alterations in pancreatic adenocarcinoma. Further investigation in high-risk subjects may elucidate the role of one or more of these genes in genetic predisposition to pancreatic cancer.