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van den Boom A, Lavrijssen B, Fest J, Ikram M, Stricker B, van Eijck C, Ruiter R. Appendectomy and the subsequent risk of cancer: A prospective population-based cohort study with long follow-up. Cancer Epidemiol 2022; 77:102120. [PMID: 35228019 DOI: 10.1016/j.canep.2022.102120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/17/2022] [Accepted: 02/04/2022] [Indexed: 11/27/2022]
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Ardesch FH, Ruiter R, Mulder M, Lahousse L, Stricker BHC, Kiefte-de Jong JC. The Obesity Paradox in Lung Cancer: Associations With Body Size Versus Body Shape. Front Oncol 2020; 10:591110. [PMID: 33244459 PMCID: PMC7683800 DOI: 10.3389/fonc.2020.591110] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/13/2020] [Indexed: 12/21/2022] Open
Abstract
Background The association between obesity and lung cancer (LC) remains poorly understood. However, other indices of obesity on the basis of body shape instead of body size have not been examined yet. The aim of this study was to evaluate the association between different indices of body size and body shape and the risk of LC. In particular, this study examined the association between A Body Shape Index, a more precise indicator of abdominal fat than traditional anthropometric measures, and the risk of LC. Methods In the prospective cohort the Rotterdam Study, we analysed data of 9,689 participants. LC diagnoses were based on medical records and anthropometric measurements were assessed at baseline. Cox-regression analyses with corresponding Hazard Ratios were used to examine the association between the anthropometric measurements and the risk of LC with adjustment for potential confounders. Potential non-linear associations were explored with cubic splines using the Likelihood ratio (LR) test. Results During follow-up, 319 participants developed LC. Body mass Index (BMI) was inversely associated with the risk of lung cancer (HR 0.94, 95% CI: 0.91–0.97) and persisted after excluding lung cancer cases during the first 10 years of follow-up. There was evidence for a non-linear association between BMI and the risk of lung cancer (0,04, df = 1), which indicated that the inverse association between BMI and lung cancer was mainly present in non-obese participants. Waist circumference (WC) (HR 1.03 95% CI: 1.01–1.05), Waist-to-Hip Ratio (WHR) (HR 1.23 95% CI: 1.09–1.38) and ABSI (A Body Shape Index) (HR 1.17 95% CI: 1.05–1.30) were positively and linearly associated with the risk of lung cancer. Conclusions Body shape rather than body size may be an important risk indicator of LC. Future research should focus on the role of visceral fat and the risk of LC as well as the underlying mechanisms.
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Affiliation(s)
- F H Ardesch
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands.,Department of Public Health and Primary Care/LUMC Campus The Hague, Leiden University Medical Center, The Hague, Netherlands
| | - R Ruiter
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
| | - M Mulder
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
| | - L Lahousse
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands.,Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - B H C Stricker
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
| | - J C Kiefte-de Jong
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands.,Department of Public Health and Primary Care/LUMC Campus The Hague, Leiden University Medical Center, The Hague, Netherlands
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de Las Fuentes L, Sung YJ, Sitlani CM, Avery CL, Bartz TM, Keyser CD, Evans DS, Li X, Musani SK, Ruiter R, Smith AV, Sun F, Trompet S, Xu H, Arnett DK, Bis JC, Broeckel U, Busch EL, Chen YDI, Correa A, Cummings SR, Floyd JS, Ford I, Guo X, Harris TB, Ikram MA, Lange L, Launer LJ, Reiner AP, Schwander K, Smith NL, Sotoodehnia N, Stewart JD, Stott DJ, Stürmer T, Taylor KD, Uitterlinden A, Vasan RS, Wiggins KL, Cupples LA, Gudnason V, Heckbert SR, Jukema JW, Liu Y, Psaty BM, Rao DC, Rotter JI, Stricker B, Wilson JG, Whitsel EA. Genome-wide meta-analysis of variant-by-diuretic interactions as modulators of lipid traits in persons of European and African ancestry. Pharmacogenomics J 2019; 20:482-493. [PMID: 31806883 PMCID: PMC7260079 DOI: 10.1038/s41397-019-0132-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 11/13/2019] [Accepted: 11/20/2019] [Indexed: 01/11/2023]
Abstract
Hypertension (HTN) is a significant risk factor for cardiovascular morbidity and mortality. Metabolic abnormalities, including adverse cholesterol and triglycerides (TG) profiles, are frequent comorbid findings with HTN and contribute to cardiovascular disease. Diuretics, which are used to treat HTN and heart failure, have been associated with worsening of fasting lipid concentrations. Genome-wide meta-analyses with 39,710 European-ancestry (EA) individuals and 9,925 African-ancestry (AA) individuals were performed to identify genetic variants that modify the effect of loop or thiazide diuretic use on blood lipid concentrations. Both longitudinal and cross-sectional data were used to compute cohort-specific interaction results, which were then combined through meta-analysis in each ancestry. These ancestry-specific results were further combined through trans-ancestry meta-analysis. Analysis of EA data identified two genome-wide significant (p < 5×10−8) loci with single nucleotide variant (SNV)-loop diuretic interaction on TG concentrations (including COL11A1). Analysis of AA data identified one genome-wide significant locus adjacent to BMP2 with SNV-loop diuretic interaction on TG concentrations. Trans-ancestry analysis strengthened evidence of association for SNV-loop diuretic interaction at two loci (KIAA1217 and BAALC). There were few significant SNV-thiazide diuretic interaction associations on TG concentrations and for either diuretic on cholesterol concentrations. Several promising loci were identified that may implicate biologic pathways that contribute to adverse metabolic side effects from diuretic therapy.
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Affiliation(s)
- L de Las Fuentes
- Cardiovascular Division, Department of Medicine, Washington University, St. Louis, MO, USA.
| | - Y J Sung
- Division of Biostatistics, Washington University, St. Louis, MO, USA
| | - C M Sitlani
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA, USA
| | - C L Avery
- Gillings School of Global Public Health, Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA
| | - T M Bartz
- Cardiovascular Health Research Unit, Departments of Medicine and Biostatistics, University of Washington, Seattle, WA, USA
| | - C de Keyser
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - D S Evans
- Research Institute, California Pacific Medical Center, San Francisco, CA, USA
| | - X Li
- Institute for Translational Genomics and Population Sciences, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - S K Musani
- Jackson Heart Study, Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - R Ruiter
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - A V Smith
- Icelandic Heart Association, Kopavogur, Iceland.,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - F Sun
- Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA
| | - S Trompet
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands.,Department of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - H Xu
- Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA
| | - D K Arnett
- Dean's Office, University of Kentucky College of Public Health, Lexington, KY, USA
| | - J C Bis
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA, USA
| | - U Broeckel
- Section of Genomic Pediatrics, Department of Pediatrics, Medicine and Physiology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - E L Busch
- Channing Division of Network Medicine, Department of Medicine, Harvard Medical School and Brigham and Women's Hospital, Boston, MA, USA.,Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Y-D I Chen
- Institute for Translational Genomics and Population Sciences, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - A Correa
- Jackson Heart Study, Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - S R Cummings
- Research Institute, California Pacific Medical Center, San Francisco, CA, USA
| | - J S Floyd
- Cardiovascular Health Research Unit, Departments of Medicine and Epidemiology, University of Washington, Seattle, WA, USA
| | - I Ford
- Robertson Center for biostatistics, University of Glasgow, Glasgow, UK
| | - X Guo
- Institute for Translational Genomics and Population Sciences, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - T B Harris
- Laboratory of Epidemiology and Population Sciences, Intramural Research Program, National Institute on Aging, Bethesda, MD, USA
| | - M A Ikram
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - L Lange
- Department of Genetics, University of Colorado, Denver, Denver, CO, USA
| | - L J Launer
- Laboratory of Epidemiology and Population Sciences, Intramural Research Program, National Institute on Aging, Bethesda, MD, USA
| | - A P Reiner
- Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.,School of Public Health, Department of Epidemiology, University of Washington, Seattle, WA, USA
| | - K Schwander
- Division of Biostatistics, Washington University, St. Louis, MO, USA
| | - N L Smith
- Cardiovascular Health Research Unit, Department of Epidemiology, University of Washington, Seattle, WA, USA.,Seattle Epidemiologic Research and Information Center (ERIC), VA Cooperative Studies Program, VA Puget Sound Health Care System, Seattle, WA, USA
| | - N Sotoodehnia
- Cardiovascular Health Research Unit, Departments of Medicine and Epidemiology, University of Washington, Seattle, WA, USA.,Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - J D Stewart
- Gillings School of Global Public Health, Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA.,Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA
| | - D J Stott
- Institute of cardiovascular and medical sciences, Faculty of Medicine, University of Glasgow, Glasgow, United Kingdom
| | - T Stürmer
- Gillings School of Global Public Health, Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA.,Center for Pharmacoepidemiology, University of North Carolina, Chapel Hill, NC, USA
| | - K D Taylor
- Institute for Translational Genomics and Population Sciences, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - A Uitterlinden
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - R S Vasan
- The Framingham Heart Study, Framingham, MA, USA.,Department of Medicine, Boston University School of Medicine, Boston, MA, USA
| | - K L Wiggins
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA, USA
| | - L A Cupples
- Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA.,The Framingham Heart Study, Framingham, MA, USA
| | - V Gudnason
- Icelandic Heart Association, Kopavogur, Iceland.,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - S R Heckbert
- Cardiovascular Health Research Unit, Department of Epidemiology, University of Washington, Seattle, WA, USA
| | - J W Jukema
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands.,Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands
| | - Y Liu
- Division of Public Health Sciences, Department of Epidemiology and Prevention, Wake Forest University, Winston-, Salem, NC, USA
| | - B M Psaty
- Cardiovascular Health Research Unit, Departments of Epidemiology, Medicine, and Health Services, University of Washington, Seattle, WA, USA.,Kaiser Permanente Washington Health Research Institute, Seattle, WA, USA
| | - D C Rao
- Division of Biostatistics, Washington University, St. Louis, MO, USA
| | - J I Rotter
- Institute for Translational Genomics and Population Sciences, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - B Stricker
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - J G Wilson
- Biophysics and Physiology, Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA
| | - E A Whitsel
- Gillings School of Global Public Health, Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA.,School of Medicine, Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
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Fest J, Ruiter R, Mooijaart SP, Ikram MA, van Eijck CHJ, Stricker BH. Erythrocyte sedimentation rate as an independent prognostic marker for mortality: a prospective population-based cohort study. J Intern Med 2019; 285:341-348. [PMID: 30537394 DOI: 10.1111/joim.12853] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND A very high erythrocyte sedimentation rate (ESR) is usually an indication of underlying pathology. Additionally, a moderately elevated ESR may also be attributable to biological ageing. Whether the ESR is a prognostic factor for mortality, regardless of age, has been scarcely investigated. Therefore, the objective was to analyse the association between elevated ESR levels and the risk of mortality in a prospective cohort of the general population. METHODS We studied data from the Rotterdam Study (1990-2014). ESR levels were measured at baseline and individuals were followed until death or end of study. Associations between moderately (20-50 mm h-1 ) and markedly (>50 mm h-1 ) elevated ESR levels and all-cause mortality were assessed using multivariate Cox proportional hazard models. RESULTS In total, 5226 participants were included, and the mean age was 70.3 years. During a median follow-up time of 14.9 years, 3749 participants died (71.7%). After adjustment, both a moderately elevated ESR and a markedly elevated ESR were associated with a significantly higher risk of overall mortality [hazard ratio (HR) 1.23, 95% confidence interval (CI) 1.12-1.35 and HR 1.89, 95% CI 1.38-2.60, respectively]. Although the ESR becomes higher with age, in a group aged above 75 years, without any comorbidities, an ESR > 20 mm h-1 remained associated with a significantly increased risk of mortality (HR 1.29, 95%CI 1.01-1.64). CONCLUSION An elevated ESR is an independent prognostic factor for mortality. Despite the fact that ESR increases with age, it remains associated with an increased risk of mortality and warrants close follow-up.
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Affiliation(s)
- J Fest
- Department of Surgery, Erasmus MC University Medical Center, Rotterdam, The Netherlands.,Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - R Ruiter
- Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands.,Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - S P Mooijaart
- Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands.,Institute for Evidence-based Medicine in Old Age, Leiden, The Netherlands
| | - M A Ikram
- Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - C H J van Eijck
- Department of Surgery, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - B H Stricker
- Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
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5
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Ordóñez-Mena JM, Walter V, Schöttker B, Jenab M, O'Doherty MG, Kee F, Bueno-de-Mesquita B, Peeters PHM, Stricker BH, Ruiter R, Hofman A, Söderberg S, Jousilahti P, Kuulasmaa K, Freedman ND, Wilsgaard T, Wolk A, Nilsson LM, Tjønneland A, Quirós JR, van Duijnhoven FJB, Siersema PD, Boffetta P, Trichopoulou A, Brenner H. Impact of prediagnostic smoking and smoking cessation on colorectal cancer prognosis: a meta-analysis of individual patient data from cohorts within the CHANCES consortium. Ann Oncol 2018; 29:472-483. [PMID: 29244072 PMCID: PMC6075220 DOI: 10.1093/annonc/mdx761] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Background Smoking has been associated with colorectal cancer (CRC) incidence and mortality in previous studies and might also be associated with prognosis after CRC diagnosis. However, current evidence on smoking in association with CRC prognosis is limited. Patients and methods For this individual patient data meta-analysis, sociodemographic and smoking behavior information of 12 414 incident CRC patients (median age at diagnosis: 64.3 years), recruited within 14 prospective cohort studies among previously cancer-free adults, was collected at baseline and harmonized across studies. Vital status and causes of death were collected for a mean follow-up time of 5.1 years following cancer diagnosis. Associations of smoking behavior with overall and CRC-specific survival were evaluated using Cox regression and standard meta-analysis methodology. Results A total of 5229 participants died, 3194 from CRC. Cox regression revealed significant associations between former [hazard ratio (HR) = 1.12; 95 % confidence interval (CI) = 1.04-1.20] and current smoking (HR = 1.29; 95% CI = 1.04-1.60) and poorer overall survival compared with never smoking. Compared with current smoking, smoking cessation was associated with improved overall (HR<10 years = 0.78; 95% CI = 0.69-0.88; HR≥10 years = 0.78; 95% CI = 0.63-0.97) and CRC-specific survival (HR≥10 years = 0.76; 95% CI = 0.67-0.85). Conclusion In this large meta-analysis including primary data of incident CRC patients from 14 prospective cohort studies on the association between smoking and CRC prognosis, former and current smoking were associated with poorer CRC prognosis compared with never smoking. Smoking cessation was associated with improved survival when compared with current smokers. Future studies should further quantify the benefits of nonsmoking, both for cancer prevention and for improving survival among CRC patients, in particular also in terms of treatment response.
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Affiliation(s)
- J M Ordóñez-Mena
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany; Network Aging Research, University of Heidelberg, Heidelberg, Germany; Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
| | - V Walter
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany.
| | - B Schöttker
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany; Network Aging Research, University of Heidelberg, Heidelberg, Germany; Institute of Health Care and Social Sciences, FOM University, Essen, Germany
| | - M Jenab
- International Agency for Research on Cancer (IARC), Lyon, France
| | - M G O'Doherty
- UKCRC Centre of Excellence for Public Health, Queens University of Belfast, Belfast, UK
| | - F Kee
- UKCRC Centre of Excellence for Public Health, Queens University of Belfast, Belfast, UK
| | - B Bueno-de-Mesquita
- Department of Chronic Diseases, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands; Department of Gastroenterology and Hepatology, University Medical Centre, Utrecht, The Netherlands; Division of Epidemiology and Biostatistics, The School of Public Health, Imperial College London, London, UK; Department of Social & Preventive Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - P H M Peeters
- Department of Epidemiology, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
| | - B H Stricker
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - R Ruiter
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - A Hofman
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands; Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, USA
| | - S Söderberg
- Department of Public Health and Clinical Medicine, Cardiology, and Heart Center, Umeå University, Umeå, Sweden
| | - P Jousilahti
- National Institute for Health and Welfare (THL), Helsinki, Finland
| | - K Kuulasmaa
- National Institute for Health and Welfare (THL), Helsinki, Finland
| | - N D Freedman
- Metabolic Epidemiology Branch, Division of Cancer Epidemiology & Genetics, National Cancer Institute, Rockville, USA
| | - T Wilsgaard
- Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - A Wolk
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - L M Nilsson
- Nutritional Research, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden; Arcum, Arctic Research Centre at Umeå University, Umeå, Sweden
| | - A Tjønneland
- Diet, Genes and Environment, Danish Cancer Society Research Center, Copenhagen, Denmark
| | - J R Quirós
- Public Health Directorate, Asturias, Spain
| | | | - P D Siersema
- Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - P Boffetta
- Hellenic Health Foundation, Athens, Greece; Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, USA
| | - A Trichopoulou
- Hellenic Health Foundation, Athens, Greece; WHO Collaborating Center for Nutrition and Health, Unit of Nutritional Epidemiology and Nutrition in Public Health, Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, Athens, Greece
| | - H Brenner
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany; Division of Preventive Oncology, German Cancer Research Center (DKFZ) and National Center for Tumor Diseases (NCT), Heidelberg, Germany; German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
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Ruiter R, Wunderink HF, Veenendaal RA, Visser LG, de Boer MGJ. Helicobacter pylori resistance in the Netherlands: a growing problem? Neth J Med 2017; 75:394-398. [PMID: 29219812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Helicobacter pylori infection is clinically associated with dyspepsia, gastric and duodenal ulcers, and gastric cancer. Increasing antimicrobial resistance in H. pylori is a worldwide problem and failure of eradication with standard triple therapy (high-dose proton pump inhibition, amoxicillin and clarithromycin) is directly related to the presence of a resistant strain. Other treatment combinations have been investigated, but with inconsistent results. Based on a review of the recent literature in conjunction with an analysis of the regional resistance data, we address the increasing complexity of H. pylori eradication therapy. Culture and susceptibility results of all first H. pylori isolates of adults (> 18 years) seen in the Leiden University Medical Center, from January 2006 to December 2015, were analysed (n = 707). An increase in clarithromycin resistance was observed from 9.8% to 18.1% (p = 0.002) in the periods from 2006-2010 and 2011-2015, respectively. For ampicillin the resistance increased from 6.3% to 10.0% (p = 0.37), and for metronidazole from 20.7% to 23.2% (p = 0.42). The tetracycline resistance remained low at 3.2% and 2.3%, respectively. The treatment paradigm is shifting towards individualised treatment rather than a one-strategy-fits-all approach. In case of treatment failure it should be strongly considered to refer a patient for endoscopy, biopsy and culture. Thereafter, targeted antimicrobial treatment based on susceptibility results can be initiated. Furthermore, accumulating data indicate that prolongation of treatment to 14 days, as opposed to the current standard 7 day course, contributes to a higher H. pylori eradication rate.
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Affiliation(s)
- R Ruiter
- Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
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7
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Krugu JK, Mevissen F, Münkel M, Ruiter R. Beyond love: a qualitative analysis of factors associated with teenage pregnancy among young women with pregnancy experience in Bolgatanga, Ghana. Cult Health Sex 2017; 19:293-307. [PMID: 27685083 DOI: 10.1080/13691058.2016.1216167] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Globally, an estimated 16 million young women aged 15 to 19 years give birth every year. Most teenage pregnancies are unintended and being pregnant or delivering a baby as a teenager can have serious adverse consequences. Knowledge of the environmental factors and social cognitive determinants influencing young women's failure to protect against unintended pregnancy is necessary to address the high rate of teenage pregnancies. We conducted semi-structured in-depth interviews with 21 young women, who had experience of pregnancy, in Bolgatanga, Ghana. The interview protocol included themes (relationships, sex, pregnancy, family planning) and determinants (knowledge, attitudes, self-efficacy, norms, risk perceptions) derived from empirical studies and theories related to sexuality behaviour. Findings show that young women's motivations for sexual relationships are mostly 'beyond love' and seem to focus on economic factors. The main means of sexual protection seems to be condom use. Other forms of contraception were believed to be linked to infertility. Sexuality remains a largely taboo topic for open discussion and sex education in schools seems limited to abstinence-only messages. The need for more open communication on matters of sexuality with young people and the provision of a more comprehensive sexuality education in school to address teenage pregnancies in Ghana, is discussed.
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Affiliation(s)
- John Kingsley Krugu
- a Department of Work and Social Psychology , Maastricht University , Maastricht , The Netherlands
- b Adolescent Sexual Reproductive Health Unit , Youth Harvest Foundation , Bolgatanga , Ghana
| | - Fraukje Mevissen
- a Department of Work and Social Psychology , Maastricht University , Maastricht , The Netherlands
| | - Meret Münkel
- a Department of Work and Social Psychology , Maastricht University , Maastricht , The Netherlands
| | - Robert Ruiter
- a Department of Work and Social Psychology , Maastricht University , Maastricht , The Netherlands
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8
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Mollema L, Harmsen IA, Broekhuizen E, Clijnk R, De Melker H, Paulussen T, Kok G, Ruiter R, Das E. Disease detection or public opinion reflection? Content analysis of tweets, other social media, and online newspapers during the measles outbreak in The Netherlands in 2013. J Med Internet Res 2015; 17:e128. [PMID: 26013683 PMCID: PMC4468573 DOI: 10.2196/jmir.3863] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 01/16/2015] [Accepted: 02/04/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND In May 2013, a measles outbreak began in the Netherlands among Orthodox Protestants who often refuse vaccination for religious reasons. OBJECTIVE Our aim was to compare the number of messages expressed on Twitter and other social media during the measles outbreak with the number of online news articles and the number of reported measles cases to answer the question if and when social media reflect public opinion patterns versus disease patterns. METHODS We analyzed measles-related tweets, other social media messages, and online newspaper articles over a 7-month period (April 15 to November 11, 2013) with regard to topic and sentiment. Thematic analysis was used to structure and analyze the topics. RESULTS There was a stronger correlation between the weekly number of social media messages and the weekly number of online news articles (P<.001 for both tweets and other social media messages) than between the weekly number of social media messages and the weekly number of reported measles cases (P=.003 and P=.048 for tweets and other social media messages, respectively), especially after the summer break. All data sources showed 3 large peaks, possibly triggered by announcements about the measles outbreak by the Dutch National Institute for Public Health and the Environment and statements made by well-known politicians. Most messages informed the public about the measles outbreak (ie, about the number of measles cases) (93/165, 56.4%) followed by messages about preventive measures taken to control the measles spread (47/132, 35.6%). The leading opinion expressed was frustration regarding people who do not vaccinate because of religious reasons (42/88, 48%). CONCLUSIONS The monitoring of online (social) media might be useful for improving communication policies aiming to preserve vaccination acceptability among the general public. Data extracted from online (social) media provide insight into the opinions that are at a certain moment salient among the public, which enables public health institutes to respond immediately and appropriately to those public concerns. More research is required to develop an automatic coding system that captures content and user's characteristics that are most relevant to the diseases within the National Immunization Program and related public health events and can inform official responses.
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Affiliation(s)
- Liesbeth Mollema
- National Institute for Public Health and the Environment, Center for Infectious Disease Control, Bilthoven, Netherlands.
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9
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Zomerdijk IM, Ruiter R, Houweling LMA, Herings RMC, Straus SMJM, Stricker BH. Dispensing of potentially teratogenic drugs before conception and during pregnancy: a population-based study. BJOG 2014; 122:1119-29. [DOI: 10.1111/1471-0528.13128] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2014] [Indexed: 12/16/2022]
Affiliation(s)
- IM Zomerdijk
- Department of Medical Informatics; Erasmus Medical Centre; Rotterdam the Netherlands
- Department of Epidemiology; Erasmus Medical Centre; Rotterdam the Netherlands
- Dutch Medicines Evaluation Board; Utrecht the Netherlands
| | - R Ruiter
- Department of Epidemiology; Erasmus Medical Centre; Rotterdam the Netherlands
| | - LMA Houweling
- PHARMO Institute for Drug Outcomes Research; Utrecht the Netherlands
| | - RMC Herings
- PHARMO Institute for Drug Outcomes Research; Utrecht the Netherlands
| | - SMJM Straus
- Department of Medical Informatics; Erasmus Medical Centre; Rotterdam the Netherlands
| | - BH Stricker
- Department of Epidemiology; Erasmus Medical Centre; Rotterdam the Netherlands
- Drug Safety Unit; Inspectorate of Health Care; The Hague the Netherlands
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10
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Kraja B, Muka T, Ruiter R, Hofman A, Stricker B, Franco O, Kiefte-de Jong J. Dietary Fatty Acids Intake and Colorectal Cancer Risk: The Rotterdam Study. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu193.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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11
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Ross V, Jongen E, Brijs T, Ruiter R, Brijs K, Wets G. The relation between cognitive control and risky driving in young novice drivers. Appl Neuropsychol Adult 2014; 22:61-72. [PMID: 25529593 DOI: 10.1080/23279095.2013.838958] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
This study investigated if decreased cognitive control, reflected in response inhibition and working-memory performance, is an underlying mechanism of risky driving in young novice drivers. Thirty-eight participants aged 17 to 25 years old, with less than 1 year of driving experience, completed a simulated drive that included several risky driving measures. Measures of response inhibition and verbal working memory were negatively associated with the standard deviation of the lateral lane position. Response inhibition, but not working memory, was also negatively related with the detection of, reaction to, and crashes with road hazards. Unexpectedly, increased cognitive control did not always relate to decreased risky driving. Visuospatial working-memory performance related positively with yellow-light running and negatively with the minimal following distance inside the city center. The findings evidence the role of cognitive control in explaining risky driving in young novice drivers. This relationship, however, differed per cognitive function and per driving parameter. Implications for future research and traffic safety interventions are discussed.
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Affiliation(s)
- Veerle Ross
- a Transportation Research Institute (IMOB), Hasselt University , Diepenbeek , Belgium
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12
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De Bruijn KMJ, Arends LR, Hansen BE, Leeflang S, Ruiter R, van Eijck CHJ. Systematic review and meta-analysis of the association between diabetes mellitus and incidence and mortality in breast and colorectal cancer. Br J Surg 2013; 100:1421-9. [PMID: 24037561 DOI: 10.1002/bjs.9229] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/20/2013] [Indexed: 12/27/2022]
Abstract
BACKGROUND Increasing evidence suggests that diabetes mellitus (DM) is associated with increased cancer incidence and mortality. Several mechanisms involved in diabetes, such as promotion of cell proliferation and decreased apoptosis, may foster carcinogenesis. This study investigated the association between DM and cancer incidence and cancer-specific mortality in patients with breast and colorectal carcinoma. METHODS A meta-analysis of controlled trials, prospective cohort studies and pooled cohort studies published after 2007 was conducted. Embase, PubMed and the Cochrane Library were searched. Summary hazard ratios (HRs) were calculated using a random-effects model. Sensitivity and subgroup analyses were performed to adjust for confounders, mode of DM assessment and follow-up time. RESULTS Twenty studies were included to investigate the association between DM and breast and colorectal cancer incidence and cancer-specific mortality. The studies predominantly comprised patients with type II DM. The overall HR for breast cancer incidence was 1·23 (95 per cent confidence interval 1·12 to 1·34) and that for colorectal cancer was 1·26 (1·14 to 1·40) in patients with DM compared with those without diabetes. The overall HR was 1·38 (1·20 to 1·58) for breast cancer- and 1·30 (1·15 to 1·47) for colorectal cancer-specific mortality in patients with DM compared with those without diabetes. CONCLUSION This meta-analysis indicated that DM is a risk factor for breast and colorectal cancer, and for cancer-specific mortality.
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Affiliation(s)
- K M J De Bruijn
- Departments of Surgery, Erasmus MC University Medical Centre, The Netherlands
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13
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van Dongen A, Ruiter R, Abraham C, Veldhuizen I. Predicting blood donation maintenance: the importance of planning future donations. Transfusion 2013; 54:821-7. [PMID: 24033122 DOI: 10.1111/trf.12397] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Revised: 07/09/2013] [Accepted: 07/09/2013] [Indexed: 11/26/2022]
Affiliation(s)
- Anne van Dongen
- Department of Donor Studies; Sanquin Research; Nijmegen the Netherlands
| | - Robert Ruiter
- Department of Work and Social Psychology; Maastricht University; Maastricht the Netherlands
| | - Charles Abraham
- Peninsula College of Medicine & Dentistry; University of Exeter; Exeter UK
| | - Ingrid Veldhuizen
- Department of Donor Studies; Sanquin Research; Nijmegen the Netherlands
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14
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Ruiter R, Oei L, Visser LE, Peltenburg HG, Hofman A, Zillikens MC, Uitterlinden AG, Rivadeneira F, Stricker BH. The effect of thiazide and loop diuretics on urinary levels of free deoxypyridinoline: an osteoclastic bone-resorption marker. J Clin Pharm Ther 2013; 38:225-9. [DOI: 10.1111/jcpt.12049] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Accepted: 01/28/2013] [Indexed: 11/27/2022]
Affiliation(s)
- R. Ruiter
- Department of Epidemiology; Erasmus MC; Rotterdam
- Department of Internal Medicine; Groene Hart Ziekenhuis; Gouda
| | - L. Oei
- Department of Internal Medicine; Erasmus MC; Rotterdam
| | - L. E. Visser
- Department of Epidemiology; Erasmus MC; Rotterdam
- Department of Internal Medicine; Erasmus MC; Rotterdam
- Department of Hospital Pharmacy; Erasmus MC; Rotterdam
| | | | - A. Hofman
- Department of Epidemiology; Erasmus MC; Rotterdam
| | | | - A. G. Uitterlinden
- Department of Epidemiology; Erasmus MC; Rotterdam
- Department of Internal Medicine; Erasmus MC; Rotterdam
| | - F. Rivadeneira
- Department of Epidemiology; Erasmus MC; Rotterdam
- Department of Internal Medicine; Erasmus MC; Rotterdam
| | - B. H. Stricker
- Department of Epidemiology; Erasmus MC; Rotterdam
- Department of Internal Medicine; Erasmus MC; Rotterdam
- Drug Safety Unit; Inspectorate of Health Care; The Hague
- Department of Medical Informatics; Erasmus MC; Rotterdam the Netherlands
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15
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Peters GJY, Ruiter R, Kok G. Address physical inactivity, but avoid stressing harms. Lancet 2012; 380:1554; author reply 1554-5. [PMID: 23122242 DOI: 10.1016/s0140-6736(12)61874-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Ruiter R, Visser LE, van Herk-Sukel MPP, Coebergh JWW, Haak HR, Geelhoed-Duijvestijn PH, Straus SMJM, Herings RMC, Stricker BHC. Risk of cancer in patients on insulin glargine and other insulin analogues in comparison with those on human insulin: results from a large population-based follow-up study. Diabetologia 2012; 55:51-62. [PMID: 21956710 PMCID: PMC3228952 DOI: 10.1007/s00125-011-2312-4] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Accepted: 08/19/2011] [Indexed: 12/13/2022]
Abstract
AIMS/HYPOTHESIS Several publications suggest an association between certain types of insulin and cancer, but with conflicting results. We investigated whether insulin glargine (A21Gly,B31Arg,B32Arg human insulin) is associated with an increased risk of cancer in a large population-based cohort study. METHODS Data for this study were obtained from dispensing records from community pharmacies individually linked to hospital discharge records from 2.5 million individuals in the Netherlands. In a cohort of incident users of insulin, the association between insulin glargine and other insulin analogues, respectively, and cancer was analysed in comparison with human insulin using Cox proportional hazard models with cumulative duration of drug use as a time-varying determinant. The first hospital admission with a primary diagnosis of cancer was considered as the main outcome; secondary analyses were performed with specific cancers as outcomes. RESULTS Of the 19,337 incident insulin users enrolled, 878 developed cancer. Use of insulin glargine was associated with a lower risk of malignancies in general in comparison with human insulin (HR 0.75, 95% CI 0.71, 0.80). In contrast, an increased risk was found for breast cancer (HR 1.58, 95% CI 1.22, 2.05). Dose-response relationships could not be identified. CONCLUSION/INTERPRETATION Users of insulin glargine and users of other insulin analogues had a lower risk of cancer in general than those using human insulin. Both associations might be a consequence of residual confounding, lack of adherence or competing risk. However, as in previous studies, we demonstrated an increased risk of breast cancer in users of insulin glargine in comparison with users of human insulin.
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MESH Headings
- Breast Neoplasms/chemically induced
- Breast Neoplasms/complications
- Breast Neoplasms/epidemiology
- Cohort Studies
- Community Pharmacy Services
- Diabetes Mellitus, Type 2/complications
- Diabetes Mellitus, Type 2/drug therapy
- Dose-Response Relationship, Drug
- Electronic Health Records
- Female
- Follow-Up Studies
- Humans
- Hypoglycemic Agents/administration & dosage
- Hypoglycemic Agents/adverse effects
- Hypoglycemic Agents/therapeutic use
- Incidence
- Insulin/administration & dosage
- Insulin/adverse effects
- Insulin/analogs & derivatives
- Insulin/therapeutic use
- Insulin Glargine
- Insulin, Long-Acting/administration & dosage
- Insulin, Long-Acting/adverse effects
- Insulin, Long-Acting/therapeutic use
- Insulin, Regular, Human/administration & dosage
- Insulin, Regular, Human/adverse effects
- Insulin, Regular, Human/therapeutic use
- Male
- Medical Record Linkage
- Middle Aged
- Neoplasms/chemically induced
- Neoplasms/complications
- Neoplasms/epidemiology
- Netherlands/epidemiology
- Patient Admission
- Proportional Hazards Models
- Risk
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Affiliation(s)
- R. Ruiter
- Department of Epidemiology, Erasmus MC, P.O. Box 2040, 3000 CA Rotterdam, the Netherlands
- Drug Safety Unit, Inspectorate of Health Care, The Hague, the Netherlands
| | - L. E. Visser
- Department of Epidemiology, Erasmus MC, P.O. Box 2040, 3000 CA Rotterdam, the Netherlands
- Department of Hospital Pharmacy, Erasmus MC, Rotterdam, the Netherlands
- Department of Internal Medicine, Erasmus MC, Rotterdam, the Netherlands
| | | | | | - H. R. Haak
- Department of Internal Medicine, Maxima Medical Centre, Eindhoven, the Netherlands
| | | | - S. M. J. M. Straus
- The Dutch Medicines Evaluation Board, The Hague, the Netherlands
- Department of Medical Informatics, Erasmus MC, Rotterdam, the Netherlands
| | - R. M. C. Herings
- PHARMO Institute for Drug Outcomes Research, Utrecht, the Netherlands
- Department of Health Policy & Management, Erasmus MC, Rotterdam, the Netherlands
| | - B. H. Ch. Stricker
- Department of Epidemiology, Erasmus MC, P.O. Box 2040, 3000 CA Rotterdam, the Netherlands
- Drug Safety Unit, Inspectorate of Health Care, The Hague, the Netherlands
- Department of Internal Medicine, Erasmus MC, Rotterdam, the Netherlands
- Department of Medical Informatics, Erasmus MC, Rotterdam, the Netherlands
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Ruiter R, E. Visser L, M. Van Duijn C, H.Ch. Stricker B. The ACE Insertion/Deletion Polymorphism and Risk of Cancer, a Review and Meta-Analysis of the Literature. Curr Cancer Drug Targets 2011; 11:421-30. [DOI: 10.2174/156800911795538147] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2010] [Accepted: 03/02/2011] [Indexed: 11/22/2022]
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18
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Reddy P, Saleh-Onoya D, Sifunda S, Lang D, Wingood G, Van den Borne B, Ruiter R. Preference for dry sex, condom use and risk of STI among HIV-negative black women in the Western Cape province, South Africa. S AFR J SCI 2009. [DOI: 10.4102/sajs.v105i1/2.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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19
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Saleh-Onoya D, Braxton ND, Sifunda S, Reddy P, Ruiter R, van den Borne B, Walters TP, Lang D, Wingood GM. SISTA South Africa: the adaptation of an efficacious HIV prevention trial conducted with African-American women for isiXhosa-speaking South African women. SAHARA J 2009; 5:186-91. [PMID: 19194600 DOI: 10.1080/17290376.2008.9724918] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Although new HIV treatments continue to offer hope for individuals living with HIV, behavioural interventions shown to reduce HIV risk behaviour remain one of the most powerful tools in curbing the HIV epidemic. Unfortunately, the development of evidence based HIV interventions is a resource-intensive process that has not progressed as quickly as the epidemiology of the disease. As the epidemic continues to evolve, there is a need to expedite the development of evidence-based HIV interventions for populations that are often disproportionately impacted by HIV/AIDS. One mechanism of accelerating the development process is to adapt evidence-based HIV interventions for vulnerable populations. The aim of this paper was to describe the adaptation process of a HIV intervention for African-American women for black South African Xhosa women. For African-American women the intervention was effective in increasing consistent condom use, sexual self-control, sexual communication, sexual assertiveness and partner adoption of norms supporting consistent condom use.
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20
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Kok G, Ruiter R, van den Hoek K, Schaalma HP, de Vries NK. Waarschuwingsplaatjes op tabaksverpakking zijn niet effectief. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/bf03078631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Honeywell R, van Groeningen CJ, Laan AC, Strocchi E, Ruiter R, Giaccone G, Peters GJ. Analysis of deoxycytidine accumulation in gemcitabine treated patients. Nucleosides Nucleotides Nucleic Acids 2007; 25:1225-32. [PMID: 17065096 DOI: 10.1080/15257770600894642] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Deoxycytidine (CdR) analogs are increasingly popular as chemotherapeutic agents and their effectiveness can be linked to the direct competition with active forms of endogenous CdR. A tandem mass spectrometric assay was developed to determine the plasma concentrations of CdR. Plasma extracts were prepared by protein precipitation and an ethyl acetate/water back extraction, and then separated chromatographically. Detection parameters were optimized for multi-reaction monitoring (MRM) tandem mass spectrometry and assay efficiency was improved using 15N3 CdR as an isotopic internal standard. Preliminary results from a gemcitabine trial are shown which indicate that CdR concentrations increase systemically during infusion, from about 5 nM to 78 nM after hepatic artery infusion and to 102 nM after systemic infusion for 24 hours. The developed assay demonstrated good sensitivity and selectivity for CdR.
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Affiliation(s)
- R Honeywell
- Department of Medical Oncology, VU University Medical Center, Amsterdam, The Netherlands
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22
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Honeywell R, Laan AC, van Groeningen CJ, Strocchi E, Ruiter R, Giaccone G, Peters GJ. The determination of gemcitabine and 2'-deoxycytidine in human plasma and tissue by APCI tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2006; 847:142-52. [PMID: 17056304 DOI: 10.1016/j.jchromb.2006.09.045] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Revised: 09/22/2006] [Accepted: 09/25/2006] [Indexed: 11/22/2022]
Abstract
A fast, sensitive and accurate method for the determination of gemcitabine (difluorodeoxycytidine; dFdC) and deoxycytidine (CdR) in human plasma/tissue was developed using LC-MS/MS techniques. Effectiveness of the method is illustrated with the analysis of plasma from a phase I trial of dFdC administered as a 24h infusion. The method was developed using (15)N(3) CdR as an internal standard across the concentration range of 1-500ng/ml, using a cold alcohol-protein precipitation followed by desorption with freeze drying. Sample clean-up for LC-MS/MS analysis was performed by an innovative liquid/liquid back extraction with ethyl acetate and water. Chromatography was performed using a Chrompak-spherisorb-phenyl-column (3.1mmx200mm, 5microm) with a 50mM formic acid: acetonitrile (9:1) mobile phase eluted at 1ml/min. Extracted samples were observed to be stable for a minimum of 48h after extraction when kept at 4 degrees C. Detection was performed using an atmospheric pressure chemical ionization (APCI) source and mass spectrometric positive multi-reaction-monitoring-mode (+MRM) for dFdC (264 m/z; 112 m/z), CdR (228 m/z; 112 m/z), and (15)N(3) CdR (231 m/z; 115 m/z) at an ion voltage of +3500V. The accuracy, precision and limit-of-quantitation (LOQ) were as follows: dFdC: 99.8%, +/-7.9%, 19nM; CdR: 100.0%, +/-5.3%, 22nM, linear range LOQ to 2microM. During 24h infusion dFdC levels were detected with no interference from either CdR or difluorodeoxyuridine (dFdU). CdR co-eluted with dFdC but selectivity demonstrated no "crosstalk" between the compounds. In conclusion the analytical assay was very sensitive, reliable and robust for the determination of plasma and tissue concentrations of dFdC and CdR.
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Affiliation(s)
- R Honeywell
- Department of Medical Oncology, VU University Medical Center, Amsterdam, The Netherlands
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23
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Sandee J, Ruiter R. Opleiding en intelligentie volgens de legerkeuringen. STAT NEERL 1958. [DOI: 10.1111/j.1467-9574.1958.tb00825.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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