Ole Petter Fraas Clausen

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Visiting address Sognsvannsveien 20 Rikshospitalet 0372 Oslo
Postal address Postboks 4950 Nydalen OUS HF Rikshospitalet 0424 Oslo

Publications

  • Joshi, Sarita; De Angelis, Paula; Zucknick, Manuela; Schjølberg, Aasa Rambæk; Andersen, Solveig Norheim & Clausen, Ole Petter Fraas (2020). Role of the Wnt signaling pathway in keratoacanthoma. Cancer Reports. ISSN 2573-8348. 3(2), p. 1–11. doi: 10.1002/cnr2.1219.
  • de la Rosa-Carrillo, Daniel; Vindenes, Harald Bjarte; Kinsler, Veronica A; Rønnestad, Arild Erlend; Ringstad, Geir & Müller, Lil-Sofie Ording [Show all 10 contributors for this article] (2018). Aggressive melanoma in an infant with congenital melanocytic nevus syndrome and multiple, NRAS and BRAF mutation-negative nodules. Pediatric dermatology. ISSN 0736-8046. 35(5), p. e281–e285. doi: 10.1111/pde.13595. Full text in Research Archive
  • Roscher, Ingrid; Falk, Ragnhild Sørum; Vos, Linda; Clausen, Ole Petter Fraas; Helsing, Per & Gjersvik, Petter [Show all 7 contributors for this article] (2018). Validating 4 staging systems for cutaneous squamous cell carcinoma using population-based data. A nested case-control study. JAMA dermatology. ISSN 2168-6068. 154(4), p. 428–434. doi: 10.1001/jamadermatol.2017.6428.
  • Joshi, Sarita; Schjølberg, Aasa Rambæk; Ekstrøm, Per Olaf; De Angelis, Paula; Zucknick, Manuela & Andersen, Solveig Norheim [Show all 7 contributors for this article] (2016). Tp53/p53 status in keratoacanthomas. Journal of cutaneous pathology. ISSN 0303-6987. 43(7), p. 571–578. doi: 10.1111/cup.12713.
  • Andresen, Kim; Boberg, Kirsten Muri; Vedeld, Hege Marie; Honne, Hilde; Jebsen, Peter Wilhelm & Hektoen, Merete [Show all 16 contributors for this article] (2015). Four DNA methylation biomarkers in biliary brush samples accurately identify the presence of cholangiocarcinoma. Hepatology. ISSN 0270-9139. 61(5), p. 1651–1659. doi: 10.1002/hep.27707.
  • Kriegbaum, Mette Camilla; Clausen, Ole Petter Fraas; Lærum, Ole Didrik & Ploug, Michael (2015). Expression of the Ly6/uPAR-Domain Proteins C4.4A and Haldisin in Non-Invasive and Invasive Skin Lesions. Journal of Histochemistry and Cytochemistry. ISSN 0022-1554. 63(2), p. 142–154. doi: 10.1369/0022155414563107.
  • Friis-Ottessen, Mariann; Burum-Auensen, Espen; Schjølberg, Aasa Rambæk; Ekstrøm, Per Olaf; Andersen, Solveig Norheim & Clausen, Ole Petter Fraas [Show all 7 contributors for this article] (2015). TP53/p53 alterations and Aurora A expression in progressor and non-progressor colectomies from patients with longstanding ulcerative colitis. International Journal of Molecular Medicine. ISSN 1107-3756. 35(1), p. 24–30. doi: 10.3892/ijmm.2014.1974.
  • Friis-Ottessen, Mariann; De Angelis, Paula; Schjølberg, Aasa Rambæk; Andersen, Solveig Norheim & Clausen, Ole Petter Fraas (2014). Reduced hTERT protein levels are associated with DNA aneuploidy in the colonic mucosa of patients suffering from longstanding ulcerative colitis. International Journal of Molecular Medicine. ISSN 1107-3756. 33(6), p. 1477–1483. doi: 10.3892/ijmm.2014.1708.
  • Friis-Ottessen, Mariann; Bendix, Laila; Kølvraa, Steen; Andersen, Solveig Norheim; De Angelis, Paula & Clausen, Ole Petter Fraas (2014). Telomere shortening correlates to dysplasia but not to DNA aneuploidy in longstanding ulcerative colitis. BMC Gastroenterology. ISSN 1471-230X. 14(1). doi: 10.1186/1471-230X-14-8.
  • Pomianowska, Ewa; Schjølberg, Aasa Rambæk; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2014). COX-2 overexpression in resected pancreatic head adenocarcinomas correlates with favourable prognosis. BMC Cancer. ISSN 1471-2407. 14458. doi: 10.1186/1471-2407-14-458.
  • Mantaka, Panagiota; Helsing, Per; Gjersvik, Petter; Bassarova, Assia Vassileva; Clausen, Ole Petter Fraas & Delabie, Jan (2013). Clinical and Histopathological Features of Folliculotropic Mycosis Fungoides: a Norwegian Patient Series. Acta Dermato-Venereologica. ISSN 0001-5555. 93(3), p. 325–329. doi: 10.2340/00015555-1476. Full text in Research Archive
  • Pomianowska, Ewa; Westgaard, Arne; Mathisen, Øystein; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2013). Prognostic Relevance of Number and Ratio of Metastatic Lymph Nodes in Resected Pancreatic, Ampullary, and Distal Bile Duct Carcinomas. Annals of Surgical Oncology. ISSN 1068-9265. 20(1), p. 233–241. doi: 10.1245/s10434-012-2592-z.
  • Westgaard, Arne; Pomianowska, Ewa; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2013). Intestinal-type and Pancreatobiliary-type Adenocarcinomas: How Does Ampullary Carcinoma Differ from Other Periampullary Malignancies? Annals of Surgical Oncology. ISSN 1068-9265. 20(2), p. 430–439. doi: 10.1245/s10434-012-2603-0.
  • Andresen, Kim; Boberg, Kirsten Muri; Vedeld, Hege Marie; Honne, Hilde; Hektoen, Merete & Wadsworth, Christopher A [Show all 13 contributors for this article] (2012). Novel target genes and a valid biomarker panel identified for cholangiocarcinoma. Epigenetics. ISSN 1559-2294. 7(11), p. 1249–1257. doi: 10.4161/epi.22191.
  • Pomianowska, Ewa; Grzyb, Krzysztof; Westgaard, Arne; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2012). Reclassification of tumour origin in resected periampullary adenocarcinomas reveals underestimation of distal bile duct cancer. European Journal of Surgical Oncology. ISSN 0748-7983. 38(11), p. 1043–1050. doi: 10.1016/j.ejso.2012.07.113.
  • Blonski, Katharina Maria; Blödorn-Schlicht, Norbert; Falk, Thomas M.; Faye, Ragnar Solberg & Clausen, Ole Petter Fraas (2012). Increased detection of cutaneous leishmaniasis in Norway by use of polymerase chain reaction. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 120(7), p. 591–596. doi: 10.1111/j.1600-0463.2012.02875.x.
  • Folseraas, Trine; Melum, Espen; Rausch, Philipp; Juran, Brian D.; Ellinghaus, Eva & Shiryaev, Alexey [Show all 40 contributors for this article] (2012). Extended analysis of a genome-wide association study in primary sclerosing cholangitis detects multiple novel risk loci. Journal of Hepatology. ISSN 0168-8278. 57(2), p. 366–375. doi: 10.1016/j.jhep.2012.03.031.
  • Jørgensen, Kristin Kaasen; Grzyb, Krzysztof; Lundin, Knut E A; Clausen, Ole Petter Fraas; Aamodt, Geir & Schrumpf, Erik [Show all 8 contributors for this article] (2012). Inflammatory bowel disease in patients with primary sclerosing cholangitis: clinical characterization in liver transplanted and non transplanted pateints. Inflammatory Bowel Diseases. ISSN 1078-0998. 18(3), p. 536–545. doi: 10.1002/ibd.21699.
  • Li, Jian; Wang, Kai; Gao, Fei; Jensen, Thomas D.; Li, Shengting T. & De Angelis, Paula [Show all 11 contributors for this article] (2012). Array Comparative Genomic Hybridization of Keratoacanthomas and Squamous Cell Carcinomas: Different Patterns of Genetic Aberrations Suggest Two Distinct Entities. Journal of Investigative Dermatology. ISSN 0022-202X. 132(8), p. 2060–2066. doi: 10.1038/jid.2012.104.
  • Holm, Sverre; Ueland, Thor; Dahl, Tuva Børresdatter; Michelsen, Annika ; Skjelland, Mona & Russell, David [Show all 14 contributors for this article] (2011). Fatty Acid Binding Protein 4 Is Associated with Carotid Atherosclerosis and Outcome in Patients with Acute Ischemic Stroke. PLOS ONE. ISSN 1932-6203. 6(12). doi: 10.1371/journal.pone.0028785.
  • Kalgaard, Ole Magne; Clausen, Ole Petter Fraas; Melbye, Ove Johan; Hovig, Torstein & Kvernebo, Knut (2011). Nonspecific Capillary Proliferation and Vasculopathy Indicate Skin Hypoxia in Erythromelalgia. Archives of Dermatology. ISSN 0003-987X. 147(3), p. 309–314. doi: 10.1001/archdermatol.2010.337.
  • Westgaard, Arne; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2011). Survival estimates after pancreatoduodenectomy skewed by non-standardized histopathology reports. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 119(10), p. 689–700. doi: 10.1111/j.1600-0463.2011.02783.x.
  • Kalgaard, Ole Magne; Clausen, Ole Petter Fraas; Melbye, Ove Johan; Hovig, Torstein & Kvernebo, Knut (2010). Nonspecific Capillary Proliferation and Vasculopathy Indicate Skin Hypoxia in Erythromelalgia. Archives of Dermatology. ISSN 0003-987X. 146(11). doi: 10.1001/archdermatol.2010.337.
  • Hannisdal, Kirsten Solberg; Schjølberg, Aasa Rambæk; De Angelis, Paula; Boysen, Morten Ebbe & Clausen, Ole Petter Fraas (2010). Human papillomavirus (HPV)-positive tonsillar carcinomas are frequent and have a favourable prognosis in males in Norway. Acta Oto-Laryngologica. ISSN 0001-6489. 130(2), p. 293–299. doi: 10.3109/00016480903071377.
  • Hannisdal, Kirsten Solberg; Burum-Auensen, Espen; Schjølberg, Aasa Rambæk; De Angelis, Paula & Clausen, Ole Petter Fraas (2010). Correlation between reduced expression of the spindle checkpoint protein BubR1 and bad prognosis in tonsillar carcinomas. Head and Neck. ISSN 1043-3074. 32(10), p. 1354–1362. doi: 10.1002/hed.21342.
  • Auensen, Espen; Skotheim, Rolf Inge; Schjølberg, Aasa Rambæk; Røislien, Jo; Lothe, Ragnhild A & Clausen, Ole Petter Fraas (2010). Spindle proteins are differentially expressed in the various histological subtypes of testicular germ cell tumors. Journal of Carcinogenesis. ISSN 0974-6773. 9(1), p. 1–1. doi: 10.4103/1477-3163.60358.
  • Xie, Xin; Nordgård, Ståle; Clausen, Ole Petter Fraas & Boysen, Morten Ebbe (2010). Prognostic Significance of Bax and Bcl-2 Expression in Adenoid Cystic Carcinoma of Major and Minor Salivary Glands of Nasal and Oral Epithelium. Open Otorhinolaryngology Journal. ISSN 1874-4281. 4, p. 20–26.
  • Brackmann, Stephan; Aamodt, Geir; Andersen, Solveig Norheim; Roald, Borghild; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2010). Widespread But Not Localized Neoplasia in Inflammatory Bowel Disease Worsens the Prognosis of Colorectal Cancer. Inflammatory Bowel Diseases. ISSN 1078-0998. 16(3), p. 474–481. doi: 10.1002/ibd.21053.
  • Gladhaug, Ivar Prydz; Westgaard, Arne; Schjølberg, Aasa Rambæk; Auensen, Espen; Pomianowska, Ewa & Clausen, Ole Petter Fraas (2010). Spindle proteins in resected pancreatic head adenocarcinomas: BubR1 is an independent prognostic factor in pancreatobiliary-type tumours. Histopathology. ISSN 0309-0167. 56(3), p. 345–355. doi: 10.1111/j.1365-2559.2010.03489.x.
  • Schjølberg, Aasa Rambæk; Clausen, Ole Petter Fraas; Auensen, Espen & De Angelis, Paula (2009). Aneuploidy Is Associated with TP53 Expression but not with BRCA1 or TERT Expression in Sporadic Colorectal Cancer. Anticancer Research. ISSN 0250-7005. 29(11), p. 4381–4387.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Frøydis, Langmark; Clausen, Ole Petter Fraas & Aadland, Erling [Show all 9 contributors for this article] (2009). Relationship between clinical parameters and the colitis-colorectal cancer interval in a cohort of patients with colorectal cancer in inflammatory bowel disease. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 44(1), p. 46–55. doi: 10.1080/00365520801977568.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Roald, Borghild; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2009). Two distinct groups of colorectal cancer in inflammatory bowel disease. Inflammatory Bowel Diseases. ISSN 1078-0998. 15(1), p. 9–16. doi: 10.1002/ibd.20542.
  • Westgaard, Arne; Schjølberg, Aasa Rambæk; Cvancarova, Milada; Eide, Tor Jacob; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2009). Differentiation markers in pancreatic head adenocarcinomas: MUC1 and MUC4 expression indicates poor prognosis in pancreatobiliary differentiated tumours. Histopathology. ISSN 0309-0167. 54(3), p. 337–347. doi: 10.1111/j.1365-2559.2009.03227.x.
  • Lehne, Gustav; Grasmo-Wendler, Unn-Hilde; Berner, Jeanne-Marie; Meza, Leonardo Andres Zepeda; Adamsen, Birgitte Lid & Flack, Aksel [Show all 10 contributors for this article] (2009). Upregulation of stem cell genes in multidrug resistant K562 leukemia cells. Leukemia Research. ISSN 0145-2126. 33(10), p. 1379–1385. doi: 10.1016/j.leukres.2009.03.028.
  • Brackmann, Stephan; Aamodt, Geir; Andersen, Solveig Norheim; Roald, Borghild; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2009). Widespread but not localized neoplasia in inflammatory bowel disease worsens the prognosis of colorectal cancer. Inflammatory Bowel Diseases. ISSN 1078-0998. doi: 10.1002/ibd.21053.
  • Westgaard, Arne; Larønningen, Siri; Mellem, Christine; Eide, Tor Jacob; Clausen, Ole Petter Fraas & Møller, Bjørn [Show all 7 contributors for this article] (2009). Are survival predictions reliable? Hospital volume versus standardisation of histopathologic reporting for accuracy of survival estimates after pancreatoduodenectomy for adenocarcinoma. European Journal of Cancer. ISSN 0959-8049. 45(16), p. 2850–2859. doi: 10.1016/j.ejca.2009.03.019.
  • Auensen, Espen; De Angelis, Paula; Schjølberg, Aasa Rambæk; Røislien, Jo; Mjaland, O & Clausen, Ole Petter Fraas (2008). Reduced level of the spindle checkpoint protein BUB1B is associated with aneuploidy in colorectal cancers. Cell Proliferation. ISSN 0960-7722. 41, p. 645–659. doi: 10.1111/j.1365-2184.2008.00539.x.
  • Westgaard, Arne; Tafjord, S; Farstad, IN; Cvancarova, M; Eide, TJ & Mathisen, O [Show all 8 contributors for this article] (2008). Pancreatobiliary versus intestinal histologic type of differentiation is an independent prognostic factor in resected periampullary adenocarcinoma. BMC Cancer. ISSN 1471-2407. 8. doi: 10.1186/1471-2407-8-170.
  • Westgaard, Arne; Tafjord, S; Farstad, IN; Cvancarova, M; Eide, TJ & Mathisen, O [Show all 8 contributors for this article] (2008). Resectable adenocarcinomas in the pancreatic head: the retroperitoneal resection margin is an independent prognostic factor. BMC Cancer. ISSN 1471-2407. 8. doi: 10.1186/1471-2407-8-5.
  • Søland, Tine Merete; Husvik, Camilla; Koppang, Hanna Strømme; Boysen, Morten Ebbe; Sandvik, Leiv & Clausen, Ole Petter Fraas [Show all 8 contributors for this article] (2008). A study of phosphorylated ERK1/2 and COX-2 in early stage (T1–T2) oral squamous cell carcinomas. Journal of Oral Pathology & Medicine. ISSN 0904-2512. 37(9), p. 535–542. doi: 10.1111/j.1600-0714.2008.00656.x.
  • De Angelis, Paula; Stokke, T; Beigi, Manigeh; Flatberg, Gøril; Enger, Marianne & Haug, Kristiane [Show all 13 contributors for this article] (2007). Chromosomal 20q gain in the DNA diploid component of aneuploid colorectal carcinomas. International Journal of Cancer. ISSN 0020-7136. 120, p. 2734–2738. doi: 10.1002/ijc.22537.
  • Løvig, Tone; Andersen, Solveig Norheim; Clausen, Ole Petter Fraas & Rognum, Torleiv Ole (2007). Microsatellite instability in long-standing ulcerative colitis. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 42. doi: 10.1080/00365520601013747.
  • Burum-Auensen, E; DeAngelis, PM; Schjølberg, Aasa Rambæk; Røislien, Jo; Andersen, Solveig Norheim & Clausen, Ole Petter Fraas (2007). Spindle proteins Aurora A and BUB1B, but not Mad2, are aberrantly expressed in dysplastic mucosa of patients with longstanding ulcerative colitis. Journal of Clinical Pathology. ISSN 0021-9746. 60, p. 1403–1408. doi: 10.1136/jcp.2006.044305.
  • Adamsen, Birgitte Lid; Kravik, Katherine Liza; Clausen, Ole Petter Fraas & De Angelis, Paula M (2007). Apoptosis, cell cycle progression and gene expression in TP53-depleted HCT116 colon cancer cells in response to short-term 5-fluorouracil treatment. International Journal of Oncology. ISSN 1019-6439. 31, p. 1491–1500.
  • Auensen, Espen; De Angelis, Paula; Schjølberg, Aasa Rambæk; Kravik, Katherine Liza; Aure, Marit Høyberg & Clausen, Ole Petter Fraas (2007). Subcellular localization of the spindle proteins Aurora A, Mad2, and BUBR1 assessed by immunohistochemistry. Journal of Histochemistry and Cytochemistry. ISSN 0022-1554. 55, p. 477–486. doi: 10.1369/jhc.6A7077.2007.
  • Frich, Lars Inge; Bjørnland, Kristin; Pettersen, Solveig; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2006). Increased Activity of Matrix Metalloproteinase 2 and 9 After Hepatic Radiofrequency Ablation. Journal of Surgical Research. ISSN 0022-4804. p. 297–304.
  • Xie, Xin; Clausen, Ole Petter Fraas & Boysen, Morten Ebbe (2006). Correlation of numerical aberrations of chromosomes X and 11 and poor prognosis in squamous cell carcinomas of the head and neck. Archives of Otolaryngology - Head & Neck Surgery. ISSN 0886-4470. 132, p. 511–515.
  • Boberg, Kirsten Muri; Jebsen, Peter Wilhelm; Clausen, Ole Petter Fraas; Foss, Aksel; Aabakken, Lars & Schrumpf, Erik (2006). Diagnostic benefit of biliary brush cytology in cholangiocarcinoma in primary sclerosing cholangitis. Journal of Hepatology. ISSN 0168-8278. 45, p. 568–574.
  • Clausen, Ole Petter Fraas; Aass, Hans Christian; Beigi, Marzieh; Purdie, Karin J; Proby, Charlotte M & Brown, Victoria L [Show all 11 contributors for this article] (2006). Are keratoacanthomas variants of squamous cell carcinomas? A comparison of chromosomal aberrations by comparative genomic hybridization. Journal of Investigative Dermatology. ISSN 0022-202X. 126, p. 2308–2315.
  • Brandsæter, Bjørn Jardar; Schrumpf, Erik; Bentdal, Øystein H.; Braband, Knut; Smith, Hans-Jørgen & Abildgaard, Andreas [Show all 8 contributors for this article] (2005). Recurrent primary sclerosing cholangitis after liver transplantation: a magnetic resonance cholangiography study with analyses of predictive factors. Liver transplantation. ISSN 1527-6465. 11(11), p. 1361–1369.
  • de Angelis, Paula; Fjell, Bjørg; Kravik, Katherine Liza; Haug, Terje; Tunheim, Siv Haugen & Reichelt, Wenche H. [Show all 10 contributors for this article] (2004). Molecular characterizations of derivatives of HCT116 colorectal cancer cells that are resistant to the chemotherapeutic agent 5-fluorouracil. International Journal of Oncology. ISSN 1019-6439. 24, p. 1279–1288.
  • Stensvold, E; Aass, Nina Kathrine; Gladhaug, Ivar Prydz; Stenwig, Anna Elisabeth; Clausen, Ole Petter Fraas & Fosså, Sophie Dorothea (2004). Erroneous diagnosis of pancreatic cancer after radiotherapy of testicular cancer. European Journal of Surgical Oncology. ISSN 0748-7983. 30(3), p. 352–355. doi: 10.1016/j.ejso.2003.09.003.
  • Xie, Xin; Clausen, Ole Petter Fraas & Boysen, Morten Ebbe (2004). Bag-1 expression as a prognostic factor in tongue squamous cell carcinomas. The Laryngoscope. ISSN 0023-852X. 114(10), p. 1785–1790.
  • Brandsæter, Bjørn Jardar; Schrumpf, Erik; Clausen, Ole Petter Fraas; Abildgaard, Andreas; Hafsahl, Geir & Bjøro, Kristian (2004). Recurrent sclerosing cholangitis or ischemic bile duct lesions - a diagnostic challenge? Liver transplantation. ISSN 1527-6465. 10(8), p. 1073–1074.
  • Løvig, Tone; Thorstensen, L.; Hofstad, Bjørn; Norheim Andersen, Solveig; Clausen, Ole Petter Fraas & Vatn, Morten H [Show all 8 contributors for this article] (2003). Genetic and protein markers related to in situ growth and multiplicity in small sporadic colorectal adenomas. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 38, p. 298–306.
  • Boberg, Kirsten Muri; Jebsen, Peter W.; Clausen, Ole Petter Fraas; Aabakken, Lars; Brekke, Inge Bjørn & Schrumpf, Erik (2003). Cholangiocarcinoma in situ in primary sclerosing cholangitis: diagnosis by brush cytology and treatment by liver transplantation. Journal of Hepatology. ISSN 0168-8278. 39.
  • Mala, Tom; Aurdal, Lars; Frich, Lars Inge; Clausen, Ole Petter Fraas; Edvin, Bjørn & Søreide, Odd [Show all 7 contributors for this article] (2003). Hepatic vascular inflow occlusion enhances tissue destruction during cryoablation of porcine liver. Journal of Surgical Research. ISSN 0022-4804. 115(2), p. 265–271.
  • Mala, Tom; Frich, Lars Inge; Aurdal, Lars; Clausen, Ole Petter Fraas; Edvin, Bjørn & Søreide, Odd [Show all 7 contributors for this article] (2003). Intraoperative contrast-enhanced MR-imaging as predictor of tissue damage during cryoablation of porcine liver. Magnetic Resonance Imaging. ISSN 0730-725X. 21(7), p. 733–740.
  • Forslund, O; de Angelis, Paula; Beigi, Marzieh; Schjølberg, Aasa Rambæk & Clausen, Ole Petter Fraas (2003). Identification of human papillomavirus in keratoacanthomas. Journal of cutaneous pathology. ISSN 0303-6987. 30, p. 423–429.
  • Xie, Xin; Clausen, Ole Petter Fraas & Boysen, Morten Ebbe (2003). Prognostic value of Bak expression in oral tongue squamous cell carcinomas. Oncology Reports. ISSN 1021-335X. 10, p. 369–374.
  • Lehne, Gustav; Sørensen, Dag R.; Tjønnfjord, Geir Erland; Beiske, Klaus; Hagve, Tor Arne & Rugstad, Hans Erik [Show all 7 contributors for this article] (2002). The cyclosporin PSC 833 increases survival and delays engraftment of human multidrug-resistant leukemia cells in xenotransplanted NOD-SCID mice. Leukemia. ISSN 0887-6924. 16, p. 2388–94.
  • Bjørnsson, E.; Boberg, Kirsten Muri; Cullen, S.; Fleming, K.A.; Clausen, Ole Petter Fraas & Fausa, Olav [Show all 8 contributors for this article] (2002). Patients with small duct primary sclerosing cholangitis have a favourable long term prognosis. Gut. ISSN 0017-5749. 51, p. 731–735.
  • Xin, Xie; Clausen, Ole Petter Fraas & Boysen, Morten Ebbe (2002). Prognostic significance of p21WAF1/CIP1 expression in tongue squamous cell carcinomas. Archives of Otolaryngology - Head & Neck Surgery. ISSN 0886-4470. 128, p. 897–902.
  • Øie, Erik; Clausen, Ole Petter Fraas; Yndestad, Arne; Grøgaard, Haakon Kiil & Attramadal, Håvard (2002). Endothelin receptor antagonism attenuates cardiomyocyte apoptosis after induction of ischemia in rats. Scandinavian Cardiovascular Journal. ISSN 1401-7431. 36, p. 108–116.
  • Clausen, Ole Petter Fraas; Beigi, Marzieh; Bolund, L.; Kølvraa, S.; Gjersvik, Petter Jensen & Mørk, Gro [Show all 7 contributors for this article] (2002). Keratoacanthomas frequently show chromosomal aberrations as assessed by comparative genomic hybridization. Journal of Investigative Dermatology. ISSN 0022-202X. 119, p. 1367–1372.

View all works in Cristin

  • Roscher, Ingrid; Falk, Ragnhild Sørum; Vos, Linda; Clausen, Ole Petter Fraas; Helsing, Per & Gjersvik, Petter [Show all 7 contributors for this article] (2018). Notice of retraction and replacement: Roscher et al. Validating 4 staging systems for cutaneous squamous cell carcinoma using population-based data: A nested case-control study. JAMA Dermatol. 2018;154(4):428-434. JAMA dermatology. ISSN 2168-6068. 154(12), p. 1488–1489. doi: 10.1001/jamadermatol.2018.4023.
  • Brackmann, Stephan; Pretorius, Maria E.; Klepp, Pasquale Catherine; Clausen, Ole Petter Fraas; Andersen, Solveig Norheim & Vatn, Morten H [Show all 9 contributors for this article] (2013). The distribution of chromosomal and microsatellite instability in colorectal cancers related to inflammatory bowel disease. Journal of Clinical Oncology. ISSN 0732-183X. 31(15).
  • Brackmann, Stephan; Pretorius, Maria E.; Andersen, Solveig Norheim; Langmark, Frøydis; Clausen, Ole Petter Fraas & Vatn, Morten [Show all 7 contributors for this article] (2011). Large scale genomic instability in patients with colorectal cancer in inflammatory bowel disease. Association with clinicohistological factors and survival.
  • Hannisdal, Kirsten Solberg; Schjølberg, Aasa Rambæk; DeAngelis, Paula M.; Boysen, Morten Ebbe & Clausen, Ole Petter Fraas (2010). HPV positive tonsillar carcinomas are frequent and have a favorable prognosis in males in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 118(3), p. 246–246.
  • Hannisdal, Kirsten Solberg; Auensen, Espen; Schjølberg, Aasa Rambæk; De Angelis, Paula & Clausen, Ole Petter Fraas (2010). Reduced expression of the spindle checkpoint protein BubR1 correlates with bad prognosis in tonsillar carcinomas. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 118(3), p. 251–251.
  • Gladhaug, Ivar Prydz; Westgaard, Arne; Schjolberg, AR; Burum-Auensen, E; Pomianowska, Ewa & Clausen, Ole Petter Fraas (2009). Spindle proteins in resected pancreatic head adenocarcinomas: BUB1B is an independent prognostic factor in pancreatobiliary-differentiated tumours. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 117(3), p. 237–238.
  • Burum-Auensen, E; Skotheim, Rolf Inge; Schjolberg, AR; Roislien, JO; Lothe, Ragnhild A & Clausen, Ole Petter Fraas (2009). Spindle proteins show significant changes in expression during germ cell carcinogenesis and are differently expressed in the subgroups of testicular germ cell cancer. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 117(3), p. 236–237.
  • Westgaard, Arne; Laronningen, S; Clausen, Ole Petter Fraas; Mellem, C; Eide, Tor Jacob & Mathisen, O [Show all 8 contributors for this article] (2009). Standardized histopathologic reporting after pancreatoduodenectomy for adenocarcinoma is necessary to determine tumour origin, nodal and margin status, and assures prognostic validity. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 44, p. 36–36.
  • Westgaard, Arne; Laronningen, S; Mellem, C; Eide, Tor Jacob; Clausen, Ole Petter Fraas & Moller, B [Show all 7 contributors for this article] (2009). Standardized histopathologic reporting improves survival estimates: A population-based nationwide study of pancreatic head resections for adenocarcinoma from the Norwegian Cancer Registry. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 117(3), p. 235–236.
  • Burum-Auensen, E; DeAngelis, PM; Schjolberg, A; Roislien, J; Mjaland, O & Clausen, Ole Petter Fraas (2009). Reduced level of the spindle checkpoint protein BUB1B is associated with aneuploidy in colorectal cancers. APMIS - Journal of Pathologiy, Microbiology and Immunology. ISSN 0903-4641. 117(3), p. 232–232.
  • Westgaard, Arne; Schjolberg, A; Cvancarova, M; Eide, Tor Jacob; Clausen, Ole Petter Fraas & Gladhaug, Ivar Prydz (2008). Histological and immunohistochemical classification and prognosis of resected periampullary adenocarcinomas. Scandinavian Journal of Gastroenterology. ISSN 0036-5521. 43, p. 33–34.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Roald, Borghild Barth-H; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2008). Colorectal cancer in inflammatory bowel disease without distant dysplasia may be a specific entity. Gastroenterology. ISSN 0016-5085. 134(4), p. A292–A292.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Roald, Borghild Barth-H; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2008). Widespread but not localized neoplasia in IBD worsens the prognosis of CRC.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Roald, Borghild Barth-H; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2008). COLORECTAL CANCER IN INFLAMMATORY BOWEL DISEASE WITHOUT DISTANT DYSPLASIA MAY BE A SPECIFIC ENTITY.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Roald, Borghild Barth-H; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2008). Colorectal cancer in inflammatory bowel disease without distant dysplasia may be a specific entity.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Roald, Borghild Barth-H; Langmark, Frøydis & Clausen, Ole Petter Fraas [Show all 10 contributors for this article] (2008). Colorectal cancer in inflammatory bowel disease without distant dysplasia may be a specific entity.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Langmark, Frøydis; Clausen, Ole Petter Fraas & Aadland, Erling [Show all 9 contributors for this article] (2007). IBD relatert colorectalcancer overlevelelse i forhold til cancer screening.
  • Westgaard, Arne; Tafjord, Svetlana; Farstad, Inger Nina; Cvancarova, Milada; Eide, Tor Jacob & Mathisen, Øystein [Show all 8 contributors for this article] (2007). Histologisk type er en uavhengig prognostisk faktor etter pankreatikoduodenektomi for periampullært adenokarsinom.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Langmark, Frøydis; Clausen, Ole Petter Fraas & Aadland, Erling [Show all 9 contributors for this article] (2007). Risk factors affecting duration of colitis-CRC interval in a cohort of CRC in IBD.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Fausa, Olav; Aadland, Erling & Rydning, Andreas [Show all 9 contributors for this article] (2006). Overlevelse ved Kronisk Inflammatorisk Tarmsydkom relatert Colorectal Cancer.
  • Westgaard, Arne; Tafjord, Svetlana; Farstad, Inger Nina; Eide, Tor Jacob; Mathisen, Øystein & Clausen, Ole Petter Fraas [Show all 7 contributors for this article] (2006). Whipple-operasjon for adenokarsinom, Rikshospitalet 1998-2004: Retroperitoneale reseksjonsflate og histologisk type.
  • Westgaard, Arne; Tafjord, Svetlana; Farstad, Inger Nina; Cvancarova, Milada; Eide, Tor Jacob & Mathisen, Øystein [Show all 8 contributors for this article] (2006). Histologisk type er en uavhengig prognostisk faktor etter pankreatikoduodenektomi for adenokarsinom i pancreashodet.
  • Tafjord, Svetlana; Westgaard, Arne; Farstad, Inger Nina; Eide, Tor Jacob; Mathisen, Øystein & Clausen, Ole Petter Fraas [Show all 7 contributors for this article] (2006). Retroperitoneale reseksjonsrand er en uavhengig prognostisk faktor ved pankreatikoduodenektomi for periampullært adenokarsinom.
  • Westgaard, Arne; Tafjord, Svetlana; Farstad, Inger Nina; Eide, Tor Jacob; Mathisen, Øystein & Clausen, Ole Petter Fraas [Show all 7 contributors for this article] (2006). Retroperitoneale reseksjonsrand er en uavhengig prognostisk faktor ved pankreatikoduodenektomi for periampullært adenokarsinom.
  • Westgaard, Arne; Tafjord, Svetlana; Farstad, Inger Nina; Eide, Tor Jacob; Mathisen, Øystein & Clausen, Ole Petter Fraas [Show all 7 contributors for this article] (2006). Histologisk type er en uavhengig prognostisk faktor ved pankreatikoduodenektomi for periampullært adenokarsinom.
  • Brackmann, Stephan; Andersen, Solveig Norheim; Aamodt, Geir; Langmark, Frøydis; Clausen, Ole Petter Fraas & Aadland, Erling [Show all 9 contributors for this article] (2006). RISKFACTORS AND SURVIVAL IN PATIENTS WITH IBD AND COLORECTAL CANCER.
  • Søland, Tine Merete; Husvik, Camilla; Koppang, Hanna Strømme; Boysen, Morten Ebbe; Sandvik, Leiv & Clausen, Ole Petter Fraas [Show all 7 contributors for this article] (2006). Clinical importance of phosphorylated ERK1/2 MAPK and COX-2 at the invasive front of T1-T2 oral squamous cell carcinoma.
  • Westgaard, Arne; Tafjord, Svetlana; Clausen, Ole Petter Fraas; Farstad, Inger Nina & Gladhaug, Ivar (2005). Systematisk makroskopisk og mikroskopisk undersøkelse av Whipple-resektater 1998-2004.
  • Søland, Tine Merete; Husvik, Camilla; Kleinberg, Lilach; Koppang, Hanna Strømme; Boysen, Morten Ebbe & Davidson, Ben [Show all 9 contributors for this article] (2005). Prognostic markers in the invasive front of of OSCC.
  • Søland, Tine Merete; Husvik, Camilla; Koppang, Hanna Strømme; Boysen, Morten Ebbe; Sandvik, Leiv & Clausen, Ole Petter Fraas [Show all 8 contributors for this article] (2005). Singel cell invasion in high risk patients.
  • Forslund, O; de Angelis, Paula; Beigi, M; Schjølberg, Aasa Rambæk & Clausen, Ole Petter Fraas (2004). Keratoacanthoma vs. squamous cell carcinoma in contrast with keratoacanthoma is squamous cell carcinoma - Response. Journal of cutaneous pathology. ISSN 0303-6987. 31, p. 292–293.
  • Søland, Tine Merete; Schreurs, Olav Joseph F; Husvik, Camilla; Clausen, Ole Petter Fraas; Boysen, Morten Ebbe & Sudbø, Jon [Show all 7 contributors for this article] (2004). COX-2, APC and beta-catenin in the invasive front of oral squamous cell carcinomas and their relation to prognosis.
  • Lehne, Gustav; Sørensen, Dag R.; Tjønnfjord, Geir Erland; Beiske, C.; Hagve, Tor Arne & Rugstad, Hans Erik [Show all 7 contributors for this article] (2003). Cytotoxic effects of the cyclosporin PSC 833 in human myeloblasts with high expression levels of P-glycoprotein in vitro and in vivo using xenotransplanted NOD-SCID mice.
  • Friis-Ottessen, Mariann & Clausen, Ole Petter Fraas (2015). Genotypic and phenotypic changes in the colonic mucosa of patients suffering from longstanding ulcerative colitis. Unipub forlag. ISSN 978-82-8264-927-8.
  • Auensen, Espen & Clausen, Ole Petter Fraas (2008). Expression of spindle proteins in colorectal carcinogenesis and their association to DNA aneuploidy. Unipub forlag. ISSN 9788280727299.

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Published Feb. 3, 2016 9:01 AM - Last modified Feb. 3, 2016 9:01 AM