Ole Petter F Clausen

Summary

Affiliation: Rikshospitalet University Hospital
Country: Norway

Publications

  1. ncbi request reprint A strategy combining flow sorting and comparative genomic hybridization for studying genetic aberrations at different stages of colorectal tumorigenesis in ulcerative colitis
    O P Clausen
    Institute of Pathology, The National Hospital, University of Oslo, Oslo, Norway
    Cytometry 43:46-54. 2001
  2. ncbi request reprint Keratoacanthomas frequently show chromosomal aberrations as assessed by comparative genomic hybridization
    Ole Petter F Clausen
    Institute and Department of Pathology, University of Oslo, Rikshospitalet, Oslo, Norway
    J Invest Dermatol 119:1367-72. 2002
  3. pmc Are keratoacanthomas variants of squamous cell carcinomas? A comparison of chromosomal aberrations by comparative genomic hybridization
    Ole Petter F Clausen
    Institute and Department of Pathology, Rikshospitalet, University of Oslo, Oslo, Norway
    J Invest Dermatol 126:2308-15. 2006
  4. doi request reprint Intestinal-type and pancreatobiliary-type adenocarcinomas: how does ampullary carcinoma differ from other periampullary malignancies?
    Arne Westgaard
    Department of Oncology, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
    Ann Surg Oncol 20:430-9. 2013
  5. pmc Pancreatobiliary versus intestinal histologic type of differentiation is an independent prognostic factor in resected periampullary adenocarcinoma
    Arne Westgaard
    Faculty of Medicine, University of Oslo, Rikshospitalet University Hospital, 0027 Oslo, Norway
    BMC Cancer 8:170. 2008
  6. doi request reprint Spindle proteins in resected pancreatic head adenocarcinomas: BubR1 is an independent prognostic factor in pancreatobiliary-type tumours
    Ivar P Gladhaug
    Faculty of Medicine, University of Oslo, and Rikshospitalet University Hospital, Oslo, Norway
    Histopathology 56:345-55. 2010
  7. doi request reprint Prognostic relevance of number and ratio of metastatic lymph nodes in resected pancreatic, ampullary, and distal bile duct carcinomas
    Ewa Pomianowska
    Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, and Department of Hepato pancreato biliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
    Ann Surg Oncol 20:233-41. 2013
  8. doi request reprint Survival estimates after pancreatoduodenectomy skewed by non-standardized histopathology reports
    Arne Westgaard
    Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Norway
    APMIS 119:689-700. 2011
  9. doi request reprint Correlation between reduced expression of the spindle checkpoint protein BubR1 and bad prognosis in tonsillar carcinomas
    Kirsten Hannisdal
    Department of Otorhinolaryngology Head and Neck Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
    Head Neck 32:1354-62. 2010
  10. doi request reprint Are survival predictions reliable? Hospital volume versus standardisation of histopathologic reporting for accuracy of survival estimates after pancreatoduodenectomy for adenocarcinoma
    Arne Westgaard
    University of Oslo, Rikshospitalet University Hospital, Oslo 0027, Norway
    Eur J Cancer 45:2850-9. 2009

Detail Information

Publications24

  1. ncbi request reprint A strategy combining flow sorting and comparative genomic hybridization for studying genetic aberrations at different stages of colorectal tumorigenesis in ulcerative colitis
    O P Clausen
    Institute of Pathology, The National Hospital, University of Oslo, Oslo, Norway
    Cytometry 43:46-54. 2001
    ..Therefore, it is of particular interest to study genetic aberrations behind DNA aneuploidization during colorectal carcinogenesis. We wanted to elucidate further the relationship between mucosal morphology and DNA aberrations in UC...
  2. ncbi request reprint Keratoacanthomas frequently show chromosomal aberrations as assessed by comparative genomic hybridization
    Ole Petter F Clausen
    Institute and Department of Pathology, University of Oslo, Rikshospitalet, Oslo, Norway
    J Invest Dermatol 119:1367-72. 2002
    ....
  3. pmc Are keratoacanthomas variants of squamous cell carcinomas? A comparison of chromosomal aberrations by comparative genomic hybridization
    Ole Petter F Clausen
    Institute and Department of Pathology, Rikshospitalet, University of Oslo, Oslo, Norway
    J Invest Dermatol 126:2308-15. 2006
    ..0434). The patterns of recurrent aberrations were also different in the two types of neoplasms, pointing to different genetic mechanisms involved in their developments...
  4. doi request reprint Intestinal-type and pancreatobiliary-type adenocarcinomas: how does ampullary carcinoma differ from other periampullary malignancies?
    Arne Westgaard
    Department of Oncology, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
    Ann Surg Oncol 20:430-9. 2013
    ..We evaluated whether the histologic type itself is more important for long-term survival than the fact that the tumor originated in the ampulla...
  5. pmc Pancreatobiliary versus intestinal histologic type of differentiation is an independent prognostic factor in resected periampullary adenocarcinoma
    Arne Westgaard
    Faculty of Medicine, University of Oslo, Rikshospitalet University Hospital, 0027 Oslo, Norway
    BMC Cancer 8:170. 2008
    ....
  6. doi request reprint Spindle proteins in resected pancreatic head adenocarcinomas: BubR1 is an independent prognostic factor in pancreatobiliary-type tumours
    Ivar P Gladhaug
    Faculty of Medicine, University of Oslo, and Rikshospitalet University Hospital, Oslo, Norway
    Histopathology 56:345-55. 2010
    ..Dysfunction of these proteins is implicated in the development of many cancers. The aim was to examine their possible prognostic impact in resected adenocarcinomas in the pancreatic head...
  7. doi request reprint Prognostic relevance of number and ratio of metastatic lymph nodes in resected pancreatic, ampullary, and distal bile duct carcinomas
    Ewa Pomianowska
    Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, and Department of Hepato pancreato biliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
    Ann Surg Oncol 20:233-41. 2013
    ..Ampullary (AC), biliary (DBC), and pancreatic (PC) adenocarcinomas are biologically distinct, and nodal involvement may have different prognostic importance among these separate cancers...
  8. doi request reprint Survival estimates after pancreatoduodenectomy skewed by non-standardized histopathology reports
    Arne Westgaard
    Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Norway
    APMIS 119:689-700. 2011
    ..Lymph node involvement and histological type are independent prognostic factors after pancreatoduodenectomy for adenocarcinoma...
  9. doi request reprint Correlation between reduced expression of the spindle checkpoint protein BubR1 and bad prognosis in tonsillar carcinomas
    Kirsten Hannisdal
    Department of Otorhinolaryngology Head and Neck Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
    Head Neck 32:1354-62. 2010
    ..The aim of the present study was to examine their possible impact on prognosis in tonsillar carcinomas and their relation to clinical variables, the prevalence of human papillomavirus (HPV), p53 status, and Ki-67 positivity...
  10. doi request reprint Are survival predictions reliable? Hospital volume versus standardisation of histopathologic reporting for accuracy of survival estimates after pancreatoduodenectomy for adenocarcinoma
    Arne Westgaard
    University of Oslo, Rikshospitalet University Hospital, Oslo 0027, Norway
    Eur J Cancer 45:2850-9. 2009
    ..018). Standardised evaluation was more important than hospital volume for completeness of histopathologic reporting and for accuracy of survival estimates...
  11. pmc Differentiation markers in pancreatic head adenocarcinomas: MUC1 and MUC4 expression indicates poor prognosis in pancreatobiliary differentiated tumours
    Arne Westgaard
    Faculty of Medicine, University of Oslo, Rikshospitalet University Hospital, Oslo, Norway
    Histopathology 54:337-47. 2009
    ....
  12. pmc Reduced hTERT protein levels are associated with DNA aneuploidy in the colonic mucosa of patients suffering from longstanding ulcerative colitis
    Mariann Friis-Ottessen
    Division of Diagnostics and Intervention, Department of Pathology, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway
    Int J Mol Med 33:1477-83. 2014
    ....
  13. pmc Resectable adenocarcinomas in the pancreatic head: the retroperitoneal resection margin is an independent prognostic factor
    Arne Westgaard
    Faculty of Medicine, University of Oslo, Rikshospitalet University Hospital, 0027 Oslo, Norway
    BMC Cancer 8:5. 2008
    ..The aim of the study was to determine whether retroperitoneal margin involvement independently predicts survival after pancreaticoduodenectomy within a framework of standardized assessment of the resected specimens...
  14. doi request reprint Human papillomavirus (HPV)-positive tonsillar carcinomas are frequent and have a favourable prognosis in males in Norway
    Kirsten Hannisdal
    Department of Oto Rhino Laryngology, Head and Neck Surgery, Oslo University Hospital, Oslo, Norway
    Acta Otolaryngol 130:293-9. 2010
    ..This study confirms a high prevalence of human papillomavirus (HPV)-positive tonsillar tumours (52%). The survival of the HPV-positive group was significantly better in males...
  15. ncbi request reprint Subcellular localization of the spindle proteins Aurora A, Mad2, and BUBR1 assessed by immunohistochemistry
    Espen Burum-Auensen
    The Pathology Clinic, Rikshospitalet Radiumhospitalet Medical Center, University of Oslo, Oslo, Norway
    J Histochem Cytochem 55:477-86. 2007
    ....
  16. pmc Telomere shortening correlates to dysplasia but not to DNA aneuploidy in longstanding ulcerative colitis
    Mariann Friis-Ottessen
    Department of Pathology, Division of Diagnostics and Intervention, Oslo University Hospital, Rikshospitalet, Oslo, Norway
    BMC Gastroenterol 14:8. 2014
    ..Specifically, the abrupt shortening of one or more telomeres to a critical length, rather than bulk shortening of telomeres, seems to be associated with chromosomal instability...
  17. ncbi request reprint Correlation of numerical aberrations of chromosomes X and 11 and poor prognosis in squamous cell carcinomas of the head and neck
    Xin Xie
    Department of Otolaryngology, Institute of Pathology, Rikshospitalet, University of Oslo, Oslo, Norway
    Arch Otolaryngol Head Neck Surg 132:511-5. 2006
    ..To investigate the prognostic significance of chromosomal aberrations of chromosomes X and 11 in relation to disease-specific survival in head and neck squamous cell carcinoma...
  18. pmc Spindle proteins are differentially expressed in the various histological subtypes of testicular germ cell tumors
    Espen Burum-Auensen
    Division of Pathology, Medical Faculty, University of Oslo, Rikshospitalet, Oslo University Hospital, Oslo, Norway
    J Carcinog 9:1. 2010
    ..The importance of these spindle proteins remains unknown in the development of TGCTs, thus we have explored the expression levels of these proteins in normal and malignant testicular tissues...
  19. doi request reprint Inflammatory bowel disease in patients with primary sclerosing cholangitis: clinical characterization in liver transplanted and nontransplanted patients
    Kristin Kaasen Jørgensen
    Norwegian PSC Research Center, Clinic for Specialized Medicine and Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
    Inflamm Bowel Dis 18:536-45. 2012
    ..We aimed to describe the clinical, endoscopic, and histopathologic features of PSC-IBD in liver-transplanted and nontransplanted patients...
  20. ncbi request reprint Increased activity of matrix metalloproteinase 2 and 9 after hepatic radiofrequency ablation
    Lars Frich
    The Interventional Centre, Department of Surgery, Rikshospitalet University Hospital, University of Oslo, Oslo, Norway
    J Surg Res 135:297-304. 2006
    ..The primary aim of the study was to determine if hepatic RF ablation increased MMP-2 and MMP-9 activity in the transition zone surrounding the coagulated hepatic tissue...
  21. ncbi request reprint Bag-1 expression as a prognostic factor in tongue squamous cell carcinomas
    Xin Xie
    Department of Otolaryngology, Institute for Pathology, Rikshospitalet, University of Oslo, 0027 Oslo, Norway
    Laryngoscope 114:1785-90. 2004
    ..To investigate the prognostic significance of the antiapoptotic protein Bag-1. In addition, the relationship between Bag-1 expression, other apoptosis-related and proliferative parameters...
  22. ncbi request reprint Prognostic value of Bak expression in oral tongue squamous cell carcinomas
    Xin Xie
    Department of Otolaryngology, Rikshospitalet, University of Oslo, N 0027 Oslo, Norway
    Oncol Rep 10:369-74. 2003
    ..0001) when compared with single parameters. We conclude that Bak expression, particularly in combination with Bax expression, as well as in combination with AI, or p53 accumulation, has prognostic value in tongue SCC...
  23. ncbi request reprint Prognostic significance of p21WAF1/CIP1 expression in tongue squamous cell carcinomas
    Xin Xie
    Department of Otolaryngology and the Institute for Pathology, The National Hospital, University of Oslo, Norway
    Arch Otolaryngol Head Neck Surg 128:897-902. 2002
    ....
  24. ncbi request reprint Identification of human papillomavirus in keratoacanthomas
    Ola Forslund
    Department of Medical Microbiology, Malmo University Hospital, Lund University, SE 20502 Malmo, Sweden
    J Cutan Pathol 30:423-9. 2003
    ..Keratoacanthomas are benign, clinically distinct skin tumors that may infiltrate and show cellular atypia. A viral etiology has been suggested, and the aim was to search for human papillomavirus (HPV) in keratoacanthomas...