The most common – but unfortunately also most serious – type of cancer in the pancreas is denoted pancreatic ductal adenoarcinoma. In this project, we aim at identifying and examining new molecular markers for this tumor type. The goal is to obtain a better understanding of how pancreatic ductal adenoarcinomas arise and grow. We have isolated the tumor cells by laser microdissection and analyzed them for mutations in the genes KRAS, BRAF and EGFR. We have also investigated markers of angiogenesis in this cancer form, and analyzed the expression pattern of the postulated stem cell markers CD133 and CD44 in normal and cancerous pancreatic tissue. Currently, we are working on how the genes ABO (determining blood type) and CEL (encoding a digestive enzyme) may be implicated in pancreatic cancer.
CD133 expression (brown) in normal pancreatic tissue.
The protein is expressed in acini centers and on the internal
surface of small ducts. The red area is an islet of Langerhans.
CD133 expression (brown) in pancreatic cancer. The
protein is strongly expressed on the internal surface
of duct-like structures formed by the cancer cells.
Consultant/PhD Dag Hoem, Dept. of Surgery, Haukeland Univ. Hospital, Bergen
Consultant/PhD Heike Immervoll, Gade Laboratory for Pathology, UoBergen
PhD fellow Khadija El Jellas, Dept. of Pathology, Haukeland Univ. Hospital, Bergen
Master student Eline Mejlænder-Larsen, Gade Laboratory, UoBergen
Senior technician Solrun Steine, Gade Laboratory, UoBergen
Hoem D, Straume O, Immervoll H, Akslen LA & Molven A (2013). Vascular proliferation is associated with survival in pancreatic ductal adenocarcinoma. APMIS 121: 1037-1046.
Immervoll H, Hoem D, Steffensen OJ, Miletic H & Molven A (2011). Visualization of CD44 and CD133 in normal pancreas and pancreatic ductal adenocarcinomas: Non-overlapping membrane expression in cell populations positive for both markers. Journal of Histochemistry & Cytochemistry 59: 441-455.
Hoem D, Jensen D, Steine S, Thorsen TE, Viste A & Molven A (2008). Clinicopathological characteristics and non-adhesive organ culture of insulinomas. Scandinavian Journal of Surgery 97: 42-49.
Immervoll H, Hoem D, Sakariassen PØ, Steffensen OJ & Molven A (2008). Expression of the “stem cell marker” CD133 in pancreas and pancreatic ductal adenocarcinomas. BMC Cancer 8: 48.
Wang J, Sakariassen PØ, Tsinkalovsky O, Immervoll H, Bøe SO, Svendsen A, Prestegarden L, Røsland G, Thorsen F, Stuhr L, Molven A, Bjerkvig R & Enger PØ (2008). CD133 negative glioma cells form tumors in nude rats and give rise to CD133 positive cells. International Journal of Cancer 122: 761-768.
Søreide K, Immervoll H & Molven A (2006). Pancreatic intraepithelial neoplasia – precursors to pancreatic cancer. Tidsskrift for Den Norske Lægeforening 126: 905-908. [in Norwegian]
Immervoll H, Hoem D, Kugarajh K, Steine S & Molven A (2006). Molecular analysis of the EGFR-RAS-RAF pathway in pancreatic ductal adenocarcinomas: Lack of mutations in the BRAF and EGFR genes. Virchows Archiv 448: 788-796.