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Gould M.K.,Kaiser Permanente | Wagner T.H.,VA Palo Alto Health Care System | Wagner T.H.,Health Economics Research Center | Schultz E.M.,Stanford University | And 6 more authors.
Chest | Year: 2014

Background: PET scanning has been shown in randomized trials to reduce the frequency of surgery without cure among patients with potentially resectable non-small cell lung cancer (NSCLC). We examined whether more frequent use of PET scanning at the facility level improves survival among patients with NSCLC in real-world practice. Methods: In this prospective cohort study of 622 US veterans with newly diagnosed NSCLC, we compared groups defined by the frequency of PET scan use measured at the facility level and categorized as low ( < 25%), medium (25%-60%), or high ( > 60%). Results: The median age of the sample was 69 years. Ninety-eight percent were men, 36% were Hispanic or nonwhite, and 54% had moderate or severe comorbidities. At low-, medium-, and high-use facilities, PET scan was performed in 13%, 40%, and 72% of patients, respectively ( P < .0001). Baseline characteristics were similar across groups, including clinical stage based on CT scanning. More frequent use of PET scanning was associated with more frequent invasive staging ( P < .001) and nonsignificant improvements in downstaging ( P = .13) and surgery without cure ( P = .12). After a median of 352 days of follow-up, 22% of the sample was still alive, including 22% at low- and medium-use facilities and 20% at high-use facilities. After adjustment and compared with patients at low-use facilities, the hazard of death was greater for patients at high-use facilities (adjusted hazard ratio [HR], 1.35; 95% CI, 1.05-1.74) but not different for patients at medium-use facilities (adjusted HR, 1.14; 95% CI, 0.88-1.46). Conclusions: In this study of veterans with NSCLC, markedly greater use of PET scanning at the facility level was associated with more frequent use of invasive staging and possible improvements in downstaging and surgery without cure, but greater use of PET scanning was not associated with better survival. © 2014 American College of Chest Physicians. Source


Wagner C.L.,University of Charleston | Hamilton S.A.,United Health Centers | McNeil R.,Durham Epidemiologic Research and Information Center | Hollis B.W.,University of Charleston | And 6 more authors.
International Journal of Endocrinology | Year: 2010

Objective: Determine prevalence of vitamin D deficiency (VDD) in a diverse group of women presenting for obstetrical care at two community health centers in South Carolina at latitude 32°N. Methods and Design: Any pregnant woman presenting for care at 2 community health centers was eligible to participate. Sociodemographic and clinical history were recorded. A single blood sample was taken to measure circulating 25(OH)D as indicator of vitamin D status [25(OH)D ≥ 20ng/mL (50nmol/L deficiency; 32ng/mL (80nmol/L) insufficiency]. Total serum calcium, phosphorus, creatinine, and intact parathyroid hormone also were measured. Results: 559 women, [mean age 25.0 ± 5.4 (range 1443) years] participated: African American (48%), Hispanic (38%), Caucasian/Other (14%). Mean gestational age was 18.5 ± 8.4 (median 14.6, range 6.439.6) weeks' gestation. 48% were VDD; an additional 37% insufficient. Greatest degree was in the African American women (68% deficient; 94% insufficient). In multivariable regression, 25(OH)D retained a significant negative association with PTH (P ≥ .001). Conclusions: VDD was high in a diverse group of women, greatest in those of darker pigmentation. The negative correlation between 25(OH)D and PTH confirms their corroborative use as biomarkers of VDD. These findings raise the issue of adequacy of current vitamin D recommendations for pregnant women. Copyright 2010 Stuart A. Hamilton et al. Source


Dungan J.R.,Duke University | Hauser E.R.,Duke University | Hauser E.R.,Durham Epidemiologic Research and Information Center | Qin X.,Duke University | Kraus W.E.,Duke University
Frontiers in Genetics | Year: 2013

Survivorship is a trait characterized by endurance and virility in the face of hardship. It is largely considered a psychosocial attribute developed during fatal conditions, rather than a biological trait for robustness in the context of complex, age-dependent diseases like coronary artery disease (CAD). The purpose of this paper is to present the novel phenotype, survivorship in CAD as an observed survival advantage concurrent with clinically significant CAD. We present a model for characterizing survivorship in CAD and its relationships with overlapping time- and clinically-related phenotypes. We offer an optimal measurement interval for investigating survivorship in CAD. We hypothesize genetic contributions to this construct and review the literature for evidence of genetic contribution to overlapping phenotypes in support of our hypothesis. We also present preliminary evidence of genetic effects on survival in people with clinically significant CAD from a primary case-control study of symptomatic coronary disease. Identifying gene variants that confer improved survival in the context of clinically appreciable CAD may improve our understanding of cardioprotective mechanisms acting at the gene level and potentially impact patients clinically in the future. Further, characterizing other survival-variant genetic effects may improve signal-to-noise ratio in detecting gene associations for CAD. © 2013 Dungan, Hauser, Qin and Kraus. Source


Barrett K.M.,Mayo Medical School | Brott T.G.,Mayo Medical School | Brown Jr. R.D.,Mayo Medical School | Carter R.E.,Mayo Medical School | And 4 more authors.
Journal of Stroke and Cerebrovascular Diseases | Year: 2011

Background: Our aim was to assess the safety, tolerability, and efficacy signal of early donepezil administration with regard to enhancing recovery in a diverse acute ischemic stroke population. Methods: This was a multicenter, single-arm, National Institute of Neurological Disorders and Stroke Recombinant Tissue Plasminogen Activator trial-controlled, modified 2-stage adaptive clinical trial set in 2 tertiary care hospitals in the United States. Adults with ischemic stroke treated within 24 hours after onset of symptoms were included. The intervention studied was donepezil 5 mg/day for 30 days, followed by an increase to 10 mg/day for 60 days. Our main outcome measures included treatment-related adverse events and side effects. The primary favorable outcome was a 90-day National Institutes of Health Stroke Scale (NIHSS) score ≤1. Neurologic, cognitive, functional, and psychological outcomes were assessed longitudinally. Results: Thirty-three adults (median age 66 years; 59% female; 39% received tissue plasminogen activator) initiated treatment with donepezil. There were no treatment-related serious adverse events. Three participants (9%) discontinued donepezil because of side effects and 3 participants (9%) required a reduction to 5 mg/day after titration to 10 mg/day. Fifteen participants (45%) had a favorable outcome (NIHSS score ≤1 at day 90), and the study met prespecified criteria for continuing to a randomized trial (P < .10). Statistically significant improvements from baseline were observed with several secondary cognitive measures, including the Trail Making Tests and Mini-Mental State Exam (P < .01 for both). Conclusions: Adjuvant donepezil therapy initiated within 24 hours of acute ischemic stroke was safe and tolerated at 5 mg/day to 10 mg/day. The study met a priori criteria to move forward with a randomized clinical trial. © 2011 by National Stroke Association. Source


Singh A.,Duke University | Babyak M.A.,Duke University | Nolan D.K.,Duke University | Brummett B.H.,Duke University | And 7 more authors.
European Journal of Human Genetics | Year: 2015

We performed gene-environment interaction genome-wide association analysis (G × E GWAS) to identify SNPs whose effects on metabolic traits are modified by chronic psychosocial stress in the Multi-Ethnic Study of Atherosclerosis (MESA). In Whites, the G × E GWAS for hip circumference identified five SNPs within the Early B-cell Factor 1 (EBF1) gene, all of which were in strong linkage disequilibrium. The gene-by-stress interaction (SNP × STRESS) term P-values were genome-wide significant (Ps=7.14E-09 to 2.33E-08, uncorrected; Ps=1.99E-07 to 5.18E-07, corrected for genomic control). The SNP-only (without interaction) model P-values (Ps=0.011-0.022) were not significant at the conventional genome-wide significance level. Further analysis of related phenotypes identified gene-by-stress interaction effects for waist circumference, body mass index (BMI), fasting glucose, type II diabetes status, and common carotid intimal-medial thickness (CCIMT), supporting a proposed model of gene-by-stress interaction that connects cardiovascular disease (CVD) risk factor endophenotypes such as central obesity and increased blood glucose or diabetes to CVD itself. Structural equation path analysis suggested that the path from chronic psychosocial stress to CCIMT via hip circumference and fasting glucose was larger (estimate=0.26, P=0.033, 95% CI=0.02-0.49) in the EBF1 rs4704963 CT/CC genotypes group than the same path in the TT group (estimate=0.004, P=0.34, 95% CI=-0.004-0.012). We replicated the association of the EBF1 SNPs and hip circumference in the Framingham Offspring Cohort (gene-by-stress term P-values=0.007-0.012) as well as identified similar path relationships. This observed and replicated interaction between psychosocial stress and variation in the EBF1 gene may provide a biological hypothesis for the complex relationship between psychosocial stress, central obesity, diabetes, and cardiovascular disease. © 2015 Macmillan Publishers Limited. All rights reserved. Source

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