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Sökning: LAR1:gu > (2010) > Tidskriftsartikel > Steineck Gunnar

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  • de Verdier, Petra J., et al. (författare)
  • Genotypes, haplotypes and diplotypes of three XPC polymorphisms in urinary-bladder cancer patients
  • 2010
  • Ingår i: Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis. - : Elsevier BV. - 1879-2871 .- 0027-5107. ; 694:1-2, s. 39-44
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose The XPC gene is involved in DNA damage recognition in the nucleotide excision repair pathway (NER) We investigated the additive effects of single nucleotide polymorphisms (SNPs) in bladder-cancer patients and population controls for three XPC polymorphisms A499V (C>T) K939Q (A>C) and poly AT (PAT -/+) Experimental Design 311 bladder-cancer patients from a population-based cohort and 337 population controls were genotyped using the PCR-restriction fragment length polymorphism (RFLP) technique Results We found complete linkage between the K939Q (A>C) and PAT (-/+) polymorphisms and therefore only the K939Q (A>C) polymorphism was included in analyses The over all estimated odds ratio was 1 7 (95% CI 1 3-2 4) for A499V (C>T) and 1 4 (95% CI 1 0-2 0) for K939Q (A>C) The associated odds ratio Increase with the variant allele homozygotes was six-fold for the A499V (C>T) and three-fold for the K939Q (A>C) polymorphism (OR=5 7 95% CI 3 4-9 5 and OR=2 6 95% CI 1 3-5 6 respectively) The variant allele haplotype of the two polymorphisms (T499C939) was associated with a nearly four fold increased odds ratio compared to the common allele haplotype (C(499)A(939)) (OR=3 6 95% Cl 1 9-6 9) Combined genotype analysis showed an Increased disease association with increasing number of variant alleles (p<0 0001) with a dominant effect of the A499V polymorphism In addition we observed association of the disease with increasing number of variant alleles for the A499V polymorphism and an early age at diagnosis (p=0 004) Conclusions Our results suggest an association between the XPC genotypes of the A499V K939Q and PAT polymorphisms and urinary-bladder cancer We propose a poly-allelic effect of these polymorphisms where the cumulative effect on disease becomes higher than the individual allelic effects (C) 2010 Elsevier B V All rights reserved
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  • Enblom, Anna, et al. (författare)
  • Emesis and gastrointestinal problems during radiotherapy A comparison of performance of daily activities between patients experiencing nausea and patients free from nausea
  • 2010
  • Ingår i: European Journal of Oncology Nursing. - : Elsevier BV. - 1462-3889 .- 1532-2122. ; 14:5, s. 359-66
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose of the research To describe the experiences of nausea vomiting and gastrointestinal problems during radiotherapy and to compare patients experiencing nausea with patients not experiencing nausea regarding performance in daily activities sleeping and eating capacity Methods and sample A cross-sectional sample of 131 Swedish radiotherapy patients answered a questionnaire regarding the preceding week of radiotherapy Mean age was 63 years (standard deviation 12 1) and 56% were women The radiotherapy fields were breast (35%) abdomen/pelvis (15%) prostate/bladder (21%) head/neck (10%) and other (8%) Key results The patients experiencing nausea within the observed week (n = 31) had compared to the patients not experiencing nausea (n = 100) lower ability in daily activities in general (p = 0 001) in shopping (p = 0 014) walking (p = 0 007) and social interaction (p = 0 007) Of the patients with nausea 48% had seldom woken up rested and 34% were not able to eat as much as they used to Corresponding figures for nausea free patients were 27% (not significant ns) and 16% (ns) Six (5%) experienced vomiting 15 (12%) diarrhoea 23 (18%) constipation and 52 (40%) any gastrointestinal symptoms Forty seven (90%) were negatively bothered by the experienced gastrointestinal symptoms Conclusions The fourth of patients experiencing nausea during radiotherapy had lower ability to perform daily activities than the three quarters of patients who were free from nausea Few patients vomited while 40% experienced gastrointestinal symptoms during the observed week of radiotherapy This implies that health care professionals could consider identifying nauseous patients that possibly need support in nausea-reduction and in daily activities during radiotherapy (c) 2009 Published by Elsevier Ltd
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  • Genell, Anna, et al. (författare)
  • Model selection in Medical Research: A simulation study comparing Bayesian Model Averaging and Stepwise Regression.
  • 2010
  • Ingår i: BMC medical research methodology. - : Springer Science and Business Media LLC. - 1471-2288. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Background Automatic variable selection methods are usually discouraged in medical research although we believe they might be valuable for studies where subject matter knowledge is limited. Bayesian model averaging may be useful for model selection but only limited attempts to compare it to stepwise regression have been published. We therefore performed a simulation study to compare stepwise regression with Bayesian model averaging. Methods We simulated data corresponding to five different data generating processes and thirty different values of the effect size (the parameter estimate divided by its standard error). Each data generating process contained twenty explanatory variables in total and had between zero and two true predictors. Three data generating processes were built of uncorrelated predictor variables while two had a mixture of correlated and uncorrelated variables. We fitted linear regression models to the simulated data. We used Bayesian model averaging and stepwise regression respectively as model selection procedures and compared the estimated selection probabilities. Results The estimated probability of not selecting a redundant variable was between 0.99 and 1 for Bayesian model averaging while approximately 0.95 for stepwise regression when the redundant variable was not correlated with a true predictor. These probabilities did not depend on the effect size of the true predictor. In the case of correlation between a redundant variable and a true predictor, the probability of not selecting a redundant variable was 0.95 to 1 for Bayesian model averaging while for stepwise regression it was between 0.7 and 0.9, depending on the effect size of the true predictor. The probability of selecting a true predictor increased as the effect size of the true predictor increased and leveled out at between 0.9 and 1 for stepwise regression, while it leveled out at 1 for Bayesian model averaging. Conclusions Our simulation study showed that under the given conditions, Bayesian model averaging had a higher probability of not selecting a redundant variable than stepwise regression and had a similar probability of selecting a true predictor. Medical researchers building regression models with limited subject matter knowledge could thus benefit from using Bayesian model averaging.
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  • Hauksdóttir, Arna, et al. (författare)
  • Long-term harm of low preparedness for a wife's death from cancer--a population-based study of widowers 4-5 years after the loss.
  • 2010
  • Ingår i: American journal of epidemiology. - : Oxford University Press (OUP). - 1476-6256 .- 0002-9262. ; 172:4, s. 389-96
  • Tidskriftsartikel (refereegranskat)abstract
    • The authors examined the impact of a widower's preparedness before his wife's death from cancer on his risk of long-term morbidity. In a population-based study, 691 (76%) of 907 Swedish men who lost a wife to breast, ovarian, or colon cancer in 2000 or 2001 answered an anonymous questionnaire in 2004 or 2005 measuring preparedness at the time of the wife's death and psychological well-being at follow-up. Men aged 38-61 years with a low degree of preparedness at the time of their spouse's death had increased risk of psychological morbidity and other symptoms, such as anxiety (adjusted relative risk (aRR) = 2.1, 95% confidence interval (CI): 1.0, 4.3), a heightened startle response (aRR = 5.3, 95% CI: 1.2, 23.6), emotional numbness (aRR = 2.1, 95% CI: 1.2, 3.6), little or no grief resolution (aRR = 2.7, 95% CI: 1.3, 5.4), and sleep disorders (aRR = 2.3, 95% CI: 1.2, 4.3), 4-5 years after the loss. For older widowers (aged 62-80 years), a low degree of preparedness increased the risk of having repeated painful memories (aRR = 2.8, 95% CI: 1.5, 5.2) and a heightened startle response (aRR = 5.7, 95% CI: 1.5, 21.4) at follow-up. These results show that to improve the long-term psychological well-being of widowers, it may be fruitful to identify care-related facilitators and inhibitors of preparedness.
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