Sisse Helle Njor

ORCID: 0000-0003-0429-4176
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About
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Research Areas
  • Colorectal Cancer Screening and Detection
  • Global Cancer Incidence and Screening
  • Cancer Risks and Factors
  • Gastric Cancer Management and Outcomes
  • Cervical Cancer and HPV Research
  • Genetic factors in colorectal cancer
  • Breast Cancer Treatment Studies
  • Esophageal Cancer Research and Treatment
  • Colorectal Cancer Surgical Treatments
  • BRCA gene mutations in cancer
  • Diverticular Disease and Complications
  • Reproductive tract infections research
  • COVID-19 and healthcare impacts
  • Endometrial and Cervical Cancer Treatments
  • Molecular Biology Techniques and Applications
  • Gastrointestinal disorders and treatments
  • Inflammatory Bowel Disease
  • Migration, Health and Trauma
  • Healthcare Systems and Challenges
  • Genital Health and Disease
  • Breast Lesions and Carcinomas
  • Viral-associated cancers and disorders
  • Digital Radiography and Breast Imaging
  • Multiple and Secondary Primary Cancers
  • Endometriosis Research and Treatment

Regional Hospital Randers
2017-2025

Aarhus University
2017-2025

Lillebaelt Hospital
2024-2025

University of Southern Denmark
2024-2025

Central Denmark Region
2018-2020

Nordic Lymphoma Group
2020

Aarhus University Hospital
2016-2018

University of Copenhagen
2008-2017

Danish National Institute of Public Health
2004

To evaluate the effect on breast cancer mortality during first 10 years of mammography service screening programme that was introduced in Copenhagen 1991.Cohort study.The Copenhagen, Denmark.All women ever invited to programme. Historical, national, and historical national control groups were used.The main outcome measure mortality. We compared study group with rates groups, adjusting for age, time period, region.Breast period reduced by 25% (relative risk 0.75, 95% confidence interval 0.63...

10.1136/bmj.38313.639236.82 article EN BMJ 2005-01-13

Abstract Screening participants with a positive fecal immunochemical test (FIT) result and subsequent negative colonoscopy are quarantined from the Danish bowel cancer screening program for 8 years. This recommendation is based on evidence settings other than FIT-based screening, but referral of this not necessarily sufficient. We estimated colorectal (CRC) risk among these FIT-positive/colonoscopy-negative individuals compared it in historical unscreened population. Using national health...

10.1055/a-2551-1471 article EN Endoscopy 2025-03-21

<b>Objective</b> To use data from two longstanding, population based screening programmes to study overdiagnosis in mammography. <b>Design</b> Population cohort study. <b>Setting</b> Copenhagen municipality (from 1991) and Funen County 1993), Denmark. <b>Participants</b> 57 763 women targeted by organised screening, aged 56-69 when the started, followed up 2009. <b>Main outcome measures</b> Overdiagnosis of breast cancer assessed relative risks compared with historical control groups...

10.1136/bmj.f1064 article EN cc-by-nc BMJ 2013-02-26

Most studies of the effectiveness screening for colorectal cancer (CRC) using fecal occult blood test tested guaiac test. However, immunochemical (FIT) is now commonly used in screening. We aimed to evaluate FIT-based CRC on number incident diagnoses and stage at diagnosis individuals Denmark who were invited vs not yet invited.We collected data this register-based retrospective cohort study during first 16 months prevalence round a program (March 1, 2014 through June 30, 2015). A total...

10.1053/j.gastro.2018.03.062 article EN cc-by-nc-nd Gastroenterology 2018-04-05

Abstract Aim The aim of this study was to validate the clinical quality database Danish Colorectal Cancer Group. validation is meant focus on core data regarding staging disease, treatment provided, patient‐related factors and key complications. Method This a assessing completeness accuracy by re‐entering variables into an online module in blinded fashion comparing re‐entered with original data. A sample 5% patients from years 2014–2017 randomly selected. Results 936 identified were...

10.1111/codi.15352 article EN Colorectal Disease 2020-09-25

Background: In Denmark, a nationwide screening program for colorectal cancer was implemented in March 2014. Along with this, clinical database monitoring and research purposes established. Objective: The aim of this study to estimate the agreement validity diagnosis procedure codes Danish Colorectal Cancer Screening Database (DCCSD). Methods: All individuals positive immunochemical fecal occult blood test (iFOBT) result who were invited first 3 months since initiation identified. From these,...

10.2147/clep.s124454 article EN cc-by-nc Clinical Epidemiology 2017-02-01

Our objective was to use individual data on socio-demographic characteristics identify predictors of participation in mammography screening and control what extent they can explain the regional difference. We used from programmes Copenhagen, 1991-1999, Funen, 1993-2001, Denmark. Target groups were identified Population Register, came health authority, Statistics Included women eligible for at least 3 screens. The crude RR never versus always 3.21 (95%CI, 3.07-3.35) Copenhagen adjusted 2.55...

10.1002/ijc.23089 article EN International Journal of Cancer 2007-09-24

An organized mammography screening program was gradually implemented in Norway during the period 1996-2004. Norwegian authorities have initiated an evaluation of program. Our study focused on breast cancer mortality. Using Poisson regression, we compared change mortality from before to four counties starting early controlling for same time late. A follow-up model included death all cancers diagnosed period. only ages where offered. The group had been invited one three times and followed...

10.1002/ijc.27609 article EN International Journal of Cancer 2012-04-24

Background. In Norway, an organized screening mammography program, the Norwegian Breast Cancer Screening Program (NBCSP) started in four counties 1996 and became nationwide 2004. We collected data on pre-program activity, view of this activity we evaluated potential impact program breast cancer mortality Norway. Methods. searched sources Three reported examination two self-reported examinations. aimed at calculating annual number women examined by from 1983 to 2008, coverage rate non-program...

10.3109/0284186x.2011.599339 article EN Acta Oncologica 2011-08-11

Objectives When estimating the decline in breast cancer mortality attributable to screening, challenge is provide valid comparison groups and distinguish screening effect from other effects. In Funen, Denmark, multidisciplinary management teams started before was introduced; both activities came later rest of Denmark. Because Denmark had national protocols for treatment, but hardly any opportunistic Funen formed a “natural experiment”, providing enabling separation factors. Methods Using...

10.1177/0969141314563632 article EN Journal of Medical Screening 2014-12-09

Abstract Background Colorectal cancer (CRC) screening programs using fecal immunochemical test (FIT) have to choose a cut‐off value decide which citizens recall for colonoscopy. The evidence on the optimal is sparse and based studies with low number of cases. Methods This observational study used data from Danish Cancer Screening Database. Sensitivity specificity were estimated various values large cancers. Traditionally are found by weighting sensitivity equally. As this might result in too...

10.1002/cam4.3761 article EN cc-by Cancer Medicine 2021-02-03

Cancer risk varies geographically, and migrants are influenced by different factors before, during after migration. Increased migration from non-Western countries to the Nordic calls for a better understanding of migrants' cancer change in patterns over time. The aim this study was compare incidence mortality breast, colorectal lung between immigrant native female population Denmark, Finland, Iceland, Norway.Data national registries were processed pre-analysed each country. Multivariate...

10.1186/s12885-023-11140-6 article EN cc-by BMC Cancer 2023-07-14

Abstract In Denmark, participants in faecal immunochemical test (FIT) screening with low‐risk adenomas are recommended a return to biennial FIT‐screening. However, they participate less than the FIT‐negative group (FIT 1 ‐negative) at subsequent screening. Further, it is not clear how much this benefits from We aimed comparing CRC incidence before and next 2 ) that of those having result first time register‐based cohort study, we estimated interval (ICRC) results FIT , including ‐positivity...

10.1002/ijc.35419 article EN cc-by International Journal of Cancer 2025-03-28

Abstract The objectives of our study were to analyse the use diagnostic mammography among nonattenders and attenders in organised screening Denmark 2000, assess contamination from noninvited age groups measure impact local policy on opportunistic screening. Data all mammographies performed 2000 data women targeted by 2 programmes Copenhagen county Fyn collected. All linked Danish personal identification number. Information official with regard was collected counties. proportion using only...

10.1002/ijc.20604 article EN International Journal of Cancer 2004-09-28
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