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Hirsla is an open access repository, designed as a place to store, index, preserve and redistribute in digital format scholarly work of Landspitali employees. (A/H1N1)

  • Mendelian randomisation study of height and body mass index as modifiers of ovarian cancer risk in 22,588 BRCA1 and BRCA2 mutation carriers.

    Qian, Frank; Rookus, Matti A; Leslie, Goska; Risch, Harvey A; Greene, Mark H; Aalfs, Cora M; Adank, Muriel A; Adlard, Julian; Agnarsson, Bjarni A; Ahmed, Munaza; et al. (Nature Publishing Group, 2019-07)
    BACKGROUND: Height and body mass index (BMI) are associated with higher ovarian cancer risk in the general population, but whether such associations exist among BRCA1/2 mutation carriers is unknown. METHODS: We applied a Mendelian randomisation approach to examine height/BMI with ovarian cancer risk using the Consortium of Investigators for the Modifiers of BRCA1/2 (CIMBA) data set, comprising 14,676 BRCA1 and 7912 BRCA2 mutation carriers, with 2923 ovarian cancer cases. We created a height genetic score (height-GS) using 586 height-associated variants and a BMI genetic score (BMI-GS) using 93 BMI-associated variants. Associations were assessed using weighted Cox models. RESULTS: Observed height was not associated with ovarian cancer risk (hazard ratio [HR]: 1.07 per 10-cm increase in height, 95% confidence interval [CI]: 0.94-1.23). Height-GS showed similar results (HR = 1.02, 95% CI: 0.85-1.23). Higher BMI was significantly associated with increased risk in premenopausal women with HR = 1.25 (95% CI: 1.06-1.48) and HR = 1.59 (95% CI: 1.08-2.33) per 5-kg/m2 increase in observed and genetically determined BMI, respectively. No association was found for postmenopausal women. Interaction between menopausal status and BMI was significant (Pinteraction < 0.05). CONCLUSION: Our observation of a positive association between BMI and ovarian cancer risk in premenopausal BRCA1/2 mutation carriers is consistent with findings in the general population.
  • Resequencing Study Confirms That Host Defense and Cell Senescence Gene Variants Contribute to the Risk of Idiopathic Pulmonary Fibrosis.

    Moore, Camille; Blumhagen, Rachel Z; Yang, Ivana V; Walts, Avram; Powers, Julie; Walker, Tarik; Bishop, Makenna; Russell, Pamela; Vestal, Brian; Cardwell, Jonathan; et al. (American Thoracic Society, 2019-07-15)
    Rationale: Several common and rare genetic variants have been associated with idiopathic pulmonary fibrosis, a progressive fibrotic condition that is localized to the lung. Objectives: To develop an integrated understanding of the rare and common variants located in multiple loci that have been reported to contribute to the risk of disease. Methods: We performed deep targeted resequencing (3.69 Mb of DNA) in cases (n = 3,624) and control subjects (n = 4,442) across genes and regions previously associated with disease. We tested for associations between disease and 1) individual common variants via logistic regression and 2) groups of rare variants via sequence kernel association tests. Measurements and Main Results: Statistically significant common variant association signals occurred in all 10 of the regions chosen based on genome-wide association studies. The strongest risk variant is the MUC5B promoter variant rs35705950, with an odds ratio of 5.45 (95% confidence interval, 4.91-6.06) for one copy of the risk allele and 18.68 (95% confidence interval, 13.34-26.17) for two copies of the risk allele (P = 9.60 × 10-295). In addition to identifying for the first time that rare variation in FAM13A is associated with disease, we confirmed the role of rare variation in the TERT and RTEL1 gene regions in the risk of IPF, and found that the FAM13A and TERT regions have independent common and rare variant signals. Conclusions: A limited number of common and rare variants contribute to the risk of idiopathic pulmonary fibrosis in each of the resequencing regions, and these genetic variants focus on biological mechanisms of host defense and cell senescence.
  • Imaging Patterns Are Associated with Interstitial Lung Abnormality Progression and Mortality.

    Putman, Rachel K; Gudmundsson, Gunnar; Axelsson, Gisli Thor; Hida, Tomoyuki; Honda, Osamu; Araki, Tetsuro; Yanagawa, Masahiro; Nishino, Mizuki; Miller, Ezra R; Eiriksdottir, Gudny; et al. (American Thoracic Society, 2019-07-15)
    Rationale: Interstitial lung abnormalities (ILA) are radiologic abnormalities on chest computed tomography scans that have been associated with an early or mild form of pulmonary fibrosis. Although ILA have been associated with radiologic progression, it is not known if specific imaging patterns are associated with progression or risk of mortality. Objectives: To determine the role of imaging patterns on the risk of death and ILA progression. Methods: ILA (and imaging pattern) were assessed in 5,320 participants from the AGES-Reykjavik Study, and ILA progression was assessed in 3,167 participants. Multivariable logistic regression was used to assess factors associated with ILA progression, and Cox proportional hazards models were used to assess time to mortality. Measurements and Main Results: Over 5 years, 327 (10%) had ILA on at least one computed tomography, and 1,435 (45%) did not have ILA on either computed tomography. Of those with ILA, 238 (73%) had imaging progression, whereas 89 (27%) had stable to improved imaging; increasing age and copies of MUC5B genotype were associated with imaging progression. The definite fibrosis pattern was associated with the highest risk of progression (odds ratio, 8.4; 95% confidence interval, 2.7-25; P = 0.0003). Specific imaging patterns were also associated with an increased risk of death. After adjustment, both a probable usual interstitial pneumonia and usual interstitial pneumonia pattern were associated with an increased risk of death when compared with those indeterminate for usual interstitial pneumonia (hazard ratio, 1.7; 95% confidence interval, 1.2-2.4; P = 0.001; hazard ratio, 3.9; 95% confidence interval, 2.3-6.8;P < 0.0001), respectively. Conclusions: In those with ILA, imaging patterns can be used to help predict who is at the greatest risk of progression and early death.
  • Improving preparedness to respond to cross-border hepatitis A outbreaks in the European Union/European Economic Area: towards comparable sequencing of hepatitis A virus.

    Enkirch, Theresa; Severi, Ettore; Vennema, Harry; Thornton, Lelia; Dean, Jonathan; Borg, Maria-Louise; Ciccaglione, Anna Rita; Bruni, Roberto; Christova, Iva; Ngui, Siew Lin; et al. (European Centre for Disease Prevention and Control (ECDC), 2019-07)
    IntroductionSequence-based typing of hepatitis A virus (HAV) is important for outbreak detection, investigation and surveillance. In 2013, sequencing was central to resolving a large European Union (EU)-wide outbreak related to frozen berries. However, as the sequenced HAV genome regions were only partly comparable between countries, results were not always conclusive.AimThe objective was to gather information on HAV surveillance and sequencing in EU/European Economic Area (EEA) countries to find ways to harmonise their procedures, for improvement of cross-border outbreak responses.MethodsIn 2014, the European Centre for Disease Prevention and Control (ECDC) conducted a survey on HAV surveillance practices in EU/EEA countries. The survey enquired whether a referral system for confirming primary diagnostics of hepatitis A existed as well as a central collection/storage of hepatitis A cases' samples for typing. Questions on HAV sequencing procedures were also asked. Based on the results, an expert consultation proposed harmonised procedures for cross-border outbreak response, in particular regarding sequencing. In 2016, a follow-up survey assessed uptake of suggested methods.ResultsOf 31 EU/EEA countries, 23 (2014) and 27 (2016) participated. Numbers of countries with central collection and storage of HAV positive samples and of those performing sequencing increased from 12 to 15 and 12 to 14 respectively in 2016, with all countries typing an overlapping fragment of 218 nt. However, variation existed in the sequenced genomic regions and their lengths.ConclusionsWhile HAV sequences in EU/EEA countries are comparable for surveillance, collaboration in sharing and comparing these can be further strengthened.
  • The extent to which adequacy of staffing predicts nursing teamwork in hospitals.

    Bragadóttir, Helga; Kalisch, Beatrice J; Bergthóra Tryggvadóttir, Gudný; 1 Faculty of Nursing, School of Health Sciences, University of Iceland, Reykjavik, Iceland. 2 Landspitali University Hospital, Reykjavik, Iceland. 3 School of Nursing, University of Michigan, Ann Arbor, MI, USA. 4 The Social Science Research Institute, University of Iceland, Reykjavik, Iceland. (Wiley, 2019-06-26)
    AIMS AND OBJECTIVES: The purpose of this study was to examine the extent to which staffing adequacy predicts nursing teamwork, controlling for demographic and background variables. BACKGROUND: Findings from former studies indicate that hospital, unit and staff characteristics may be related to nursing teamwork, such as type of hospital and unit, role, gender, age, work experience, type of shift worked, shift length, number of working hours per week, overtime and staffing adequacy. Teamwork as well as staffing is identified as significant contributors to patient and staff safety in hospitals. However, the contribution of staffing to the quality of nursing teamwork is scarcely studied. DESIGN: This was a quantitative descriptive cross-sectional study using the paper-and-pencil questionnaire Nursing Teamwork Survey-Icelandic. METHODS: The study was conducted in 27 inpatient units in eight hospitals in Iceland with a sample of 925 nursing staff members. Participants were 567 registered nurses, practical nurses, unit secretaries and nurse unit managers. The Strengthening the Reporting of Observational Studies in Epidemiology checklist was used for this paper. RESULTS: When controlling for unit type, role, experience on current unit and intent to leave, perceived adequacy of staffing alone explains up to 10% of overall teamwork. Unit type, role, years of experience on current unit and perceived staffing adequacy correlated significantly with overall teamwork. CONCLUSIONS: The findings of this study indicate that unit and staff characteristics, including perceived adequacy of staffing, are associated with and explain the variability in nursing teamwork on inpatient hospital units. The findings of this study provide important information for clinical nurses, nurse managers, policymakers and instructors in health care. RELEVANCE TO CLINICAL PRACTICE: The findings underline the importance of adequate staffing for nursing teamwork in inpatient hospital units.

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