Geir Hoff

ORCID: 0000-0002-0118-6818
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About
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Research Areas
  • Colorectal Cancer Screening and Detection
  • Gastric Cancer Management and Outcomes
  • Genetic factors in colorectal cancer
  • Colorectal Cancer Surgical Treatments
  • Diverticular Disease and Complications
  • Global Cancer Incidence and Screening
  • Nutritional Studies and Diet
  • Esophageal Cancer Research and Treatment
  • Anesthesia and Sedative Agents
  • Colorectal Cancer Treatments and Studies
  • Pancreatic and Hepatic Oncology Research
  • Health Systems, Economic Evaluations, Quality of Life
  • Gut microbiota and health
  • Helicobacter pylori-related gastroenterology studies
  • Microscopic Colitis
  • Esophageal and GI Pathology
  • Health Promotion and Cardiovascular Prevention
  • Lung Cancer Diagnosis and Treatment
  • Gastrointestinal disorders and treatments
  • Mycobacterium research and diagnosis
  • Folate and B Vitamins Research
  • Gallbladder and Bile Duct Disorders
  • Gastroesophageal reflux and treatments
  • Patient-Provider Communication in Healthcare
  • Clinical practice guidelines implementation

Telemark Hospital
2016-2025

University of Oslo
2016-2025

Cancer Registry of Norway
2016-2025

Norwegian Institute of Public Health
2011-2024

Oslo University Hospital
1988-2023

Institutt for Eksperimentell Medisinsk Forskning
2021

Harvard University
2016

Institute of Health Economics
2016

Sørlandet Sykehus
2016

The Maria Sklodowska-Curie National Research Institute of Oncology
2016

The European Society of Gastrointestinal Endoscopy and United Gastroenterology present a short list key performance measures for lower gastrointestinal endoscopy. We recommend that endoscopy services across Europe adopt the following seven measurement evaluation in daily practice at center endoscopist level: <b>1</b> Rate adequate bowel preparation (minimum standard 90 %); <b>2</b> Cecal intubation rate <b>3</b> Adenoma detection 25 <b>4 </b>Appropriate polypectomy technique 80 <b>5</b>...

10.1055/s-0043-103411 article EN Endoscopy 2017-03-07

Although colonoscopy is widely used as a screening test to detect colorectal cancer, its effect on the risks of cancer and related death unclear.We performed pragmatic, randomized trial involving presumptively healthy men women 55 64 years age drawn from population registries in Poland, Norway, Sweden, Netherlands between 2009 2014. The participants were randomly assigned 1:2 ratio either receive an invitation undergo single (the invited group) or no usual-care group). primary end points...

10.1056/nejmoa2208375 article EN New England Journal of Medicine 2022-10-09

AbstractBackground: Most cases of colorectal cancer (CRC) develop from adenomas. Polypectomy is believed to reduce the incidence CRC, but this effect has never been explored in prospective controlled studies. The aim present study was evaluate polypectomy on a population-based screening program. Methods: In 1983, 400 men and women aged 50-59 years were randomly drawn population registry Telemark, Norway. They offered flexible sigmoidoscopy and, if polyps found, full colonoscopy with...

10.1080/003655299750026443 article EN Scandinavian Journal of Gastroenterology 1999-01-01

Colorectal cancer is a major health burden. Screening recommended in many countries.To estimate the effectiveness of flexible sigmoidoscopy screening on colorectal incidence and mortality population-based trial.Randomized clinical trial 100,210 individuals aged 50 to 64 years, identified from population Oslo city Telemark County, Norway. was performed 1999-2000 (55-64-year age group) 2001 (50-54-year group), with follow-up ending December 31, 2011. Of those selected, 1415 were excluded due...

10.1001/jama.2014.8266 article EN JAMA 2014-08-12

<b>Objective</b> To determine the risk of colorectal cancer after screening with flexible sigmoidoscopy. <b>Design</b> Randomised controlled trial. <b>Setting</b> Population based in two areas Norway—city Oslo and Telemark county (urban mixed urban rural populations). <b>Participants</b> 55 736 men women aged 55-64 years. <b>Intervention</b> Once only sigmoidoscopy or without a single round faecal occult blood testing (n=13 823) compared no (n=41 913). <b>Main outcome measures</b> Planned...

10.1136/bmj.b1846 article EN cc-by-nc BMJ 2009-05-29

Although colonoscopic surveillance of patients after removal adenomas is widely promoted, little known about colorectal-cancer mortality among these patients.Using the linkage Cancer Registry and Cause Death Norway, we estimated who had undergone colorectal during period from 1993 through 2007. Patients were followed 2011. We calculated standardized incidence-based ratios (SMRs) using rates for Norwegian population at large comparison. guidelines recommended colonoscopy 10 years with...

10.1056/nejmoa1315870 article EN New England Journal of Medicine 2014-08-27

<h3>Importance</h3> Although some countries have implemented widespread colonoscopy screening, most European not introduced it because of uncertainty regarding participation rates, procedure-related pain and discomfort, endoscopist performance, effectiveness. To our knowledge, no randomized trials on screening currently exist. <h3>Objective</h3> investigate rate, adenoma yield, adverse events population-based in several countries. <h3>Design, Setting, Population</h3> A clinical trial was...

10.1001/jamainternmed.2016.0960 article EN JAMA Internal Medicine 2016-05-23

Multidisciplinary, evidence-based guidelines for quality assurance in colorectal cancer screening and diagnosis have been developed by experts a project coordinated the International Agency Research on Cancer. The full guideline document covers entire process of population-based screening. It consists 10 chapters over 250 recommendations, graded according to strength recommendation supporting evidence. 450-page extensive evidence base published European Commission. chapter colonoscopic...

10.1055/s-0032-1309821 article EN other-oa Endoscopy 2012-09-25

AbstractHoff G, Foerster A, Vatn MH, Sauar J, Larsen S. Epidemiology of polyps in the rectum and colon. Recovery evaluation unresected 2 years after detection. Scand J Gastroenterol 1986, 21, 853-862In an endoscopic population screening study for colorectal among 200 men women, 50-59 age, 215 less than 5 mm diameter were left situ present 2-year follow-up examination. The attendance rate was 102 106 (96%) polyp patients 77 90 (86%) control group. Of 194 polyps, 143 (74%) polyp-bearing...

10.3109/00365528609011130 article EN Scandinavian Journal of Gastroenterology 1986-01-01

<h3>Objective</h3> Although serrated polyps may be precursors of colorectal cancer (CRC), prospective data on the long-term CRC risk in individuals with are lacking. <h3>Design</h3> In a population-based randomised trial, 12 955 aged 50–64 years were screened flexible sigmoidoscopy, while 78 220 comprised control arm. We used Cox models to estimate HRs 95% CIs for among ≥1 large polyp (≥10 mm diameter), compared adenomas at screening, and population controls, multivariate logistic regression...

10.1136/gutjnl-2014-307793 article EN Gut 2014-11-16

Abstract Background With an increased use of magnetic resonance imaging, the indications for endoscopic retrograde cholangiopancreatography (ERCP) have changed. Consequently, patterns and factors predictive complications after ERCP performed during current routine clinical practice are not well known. Methods A prospective multicentre cohort study was undertaken in 11 Norwegian hospitals. Complications mortality within 30 days were analysed by univariable multivariable regression analysis....

10.1002/bjs.8992 article EN British journal of surgery 2012-12-06

Multidisciplinary, evidence-based guidelines for quality assurance in colorectal cancer screening and diagnosis have been developed by experts a project coordinated the International Agency Research on Cancer. The full guideline document covers entire process of population-based screening. It consists 10 chapters over 250 recommendations, graded according to strength recommendation supporting evidence. 450-page extensive evidence base published European Commission. chapter endoscopy includes...

10.1055/s-0032-1309795 article EN other-oa Endoscopy 2012-09-25

The long-term effects of sigmoidoscopy screening on colorectal cancer (CRC) incidence and mortality in women men are unclear.To determine the effectiveness flexible after 15 years follow-up men.Randomized controlled trial. (ClinicalTrials.gov: NCT00119912).Oslo Telemark County, Norway.Adults aged 50 to 64 at baseline without prior CRC.Screening (between 1999 2001) with additional fecal blood testing versus no screening. Participants positive results were offered colonoscopy.Age-adjusted CRC...

10.7326/m17-1441 article EN Annals of Internal Medicine 2018-04-23

Abstract Background The presence of cancer-specific DNA methylation patterns in epithelial colorectal cells human feces provides the prospect a simple, non-invasive screening test for cancer and its precursor, adenoma. This study investigates panel epigenetic markers detection adenomas. Methods Candidate biomarkers were subjected to quantitative analysis sets tissue samples from cancers, adenomas, normal colonic mucosa. All findings verified independent clinical validation series. A total...

10.1186/1476-4598-10-85 article EN cc-by Molecular Cancer 2011-07-21

<b>Objective</b>&nbsp;To compare the effectiveness of flexible sigmoidoscopy in screening for colorectal cancer by patient sex and age. <b>Design</b>&nbsp;Pooled analysis randomised trials (the US Prostate, Lung, Colorectal Ovarian trial (PLCO), Italian Screening Colon Rectum (SCORE), Norwegian Cancer Prevention (NORCCAP)). <b>Data sources</b>&nbsp;Aggregated data were pooled from each on incidence mortality stratified sex, age at screening, colon subsite (distal <i>v</i> proximal)....

10.1136/bmj.i6673 article EN cc-by-nc BMJ 2017-01-13

<b>Background:</b> Current guidelines recommend surveillance colonoscopies after polyp removal depending on the number and characteristics of polyps, but there is a lack evidence supporting recommendations. This report outlines rationale design two randomized trials one observational study investigating evidence-based strategies following removal. <b>Study endpoints:</b> The EPoS studies started to recruit patients in April 2015. I randomizes 13 746 with low-risk adenomas (1 – 2 tubular size...

10.1055/s-0042-104116 article EN Endoscopy 2016-04-04

The comparative effectiveness of sigmoidoscopy and fecal immunochemical testing (FIT) for colorectal cancer (CRC) screening is unknown.Individuals aged 50-74 years living in Southeast Norway were randomly invited between 2012 2019 to either once-only flexible or FIT every second year. Colonoscopy was recommended after if any polyp ≥10 mm, ≥3 adenomas, advanced CRC found or, subsequent to, >15 μg hemoglobin/g feces. Data this report obtained complete recruitment both groups included 2 full...

10.1053/j.gastro.2020.11.037 article EN cc-by Gastroenterology 2020-11-21

Objective New screening tests for colorectal cancer (CRC) are rapidly emerging. Conducting trials with mortality reduction as the end point supporting their adoption is challenging. We re-examined principles underlying evaluation of new non-invasive in view technological developments and identification biomarkers. Design A formal consensus approach involving a multidisciplinary expert panel revised eight previously established principles. Results Twelve newly stated emerged. Effectiveness...

10.1136/gutjnl-2023-329701 article EN cc-by-nc Gut 2023-07-18

Importance Randomized clinical screening trials have shown that sigmoidoscopy reduces colorectal cancer (CRC) incidence and mortality. Colonoscopy has largely replaced for CRC screening, but long-term results from randomized on colonoscopy are still lacking. Objective To estimate the additional benefit of compared with sigmoidoscopy. Design, Setting, Participants This comparative effectiveness simulation study pooled data 358 204 men women randomly assigned to or usual care in 4 conducted...

10.1001/jamanetworkopen.2024.0007 article EN cc-by-nc-nd JAMA Network Open 2024-02-29

Several studies have shown that insufflation of carbon dioxide (CO2) instead air during colonoscopy can reduce postprocedural pain. However, CO2 might also lead to retention in the human body. It was recently this side effect does not occur unsedated patients, but sedation leads impaired respiration. Sedated patients may therefore be more prone retention. This randomized, double-blinded study designed investigate whether sedated patients.A total 103 consecutive undergoing were randomly...

10.1055/s-2005-870154 article EN Endoscopy 2005-07-20

Abstract Background Multiple epigenetic and genetic changes have been reported in colorectal tumors, but few of these clinical impact. This study aims to pinpoint markers that can discriminate between non-malignant malignant tissue from the large bowel, i.e. with diagnostic potential. The methylation status eleven genes ( ADAMTS1 , CDKN2A CRABP1 HOXA9 MAL MGMT MLH1 NR3C1 PTEN RUNX3 SCGB3A1 ) was determined 154 samples including normal mucosa, adenomas, carcinomas colorectum. gene-specific...

10.1186/1476-4598-7-94 article EN cc-by Molecular Cancer 2008-12-01

Hashimoto disease is a chronic autoimmune thyroiditis. Despite adequate hormone substitution, some patients have persistent symptoms that may be the result of immunologic pathophysiology.To determine whether thyroidectomy improves in with thyroiditis who still despite having normal thyroid gland function while receiving medical therapy.Randomized trial. (ClinicalTrials.gov: NCT02319538).Secondary care hospital Norway.150 aged 18 to 79 years Hashimoto-related euthyroid status replacement...

10.7326/m18-0284 article EN Annals of Internal Medicine 2019-03-11

Objective: Fatigue is a major concern for patients with ulcerative colitis (UC) and Crohn's disease (CD), but evidence from population-based studies regarding fatigue in long-standing inflammatory bowel (IBD) scarce. Our aims were to assess scores the prevalence of chronic IBD 20 years after diagnosis identify variables associated this cohort.Methods: Twenty diagnosis, cohort incident invited follow-up visit that included structured interview, clinical examination, laboratory tests...

10.1080/00365521.2016.1256425 article EN Scandinavian Journal of Gastroenterology 2016-11-17
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